summaryrefslogtreecommitdiff
path: root/main.c
blob: dd309df0773c48abb003dbeb3d1fc31a0d23857f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
/* Argument parsing and main program of GNU Make.
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
Foundation, Inc.
This file is part of GNU Make.

GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.

GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "make.h"
#include "dep.h"
#include "filedef.h"
#include "variable.h"
#include "job.h"
#include "commands.h"
#include "rule.h"
#include "debug.h"
#include "getopt.h"

#include <assert.h>
#ifdef _AMIGA
# include <dos/dos.h>
# include <proto/dos.h>
#endif
#ifdef WINDOWS32
#include <windows.h>
#include <io.h>
#include "pathstuff.h"
#endif
#ifdef __EMX__
# include <sys/types.h>
# include <sys/wait.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#ifdef _AMIGA
int __stack = 20000; /* Make sure we have 20K of stack space */
#endif

void init_dir (void);
void remote_setup (void);
void remote_cleanup (void);
RETSIGTYPE fatal_error_signal (int sig);

void print_variable_data_base (void);
void print_dir_data_base (void);
void print_rule_data_base (void);
void print_file_data_base (void);
void print_vpath_data_base (void);

void verify_file_data_base (void);

#if defined HAVE_WAITPID || defined HAVE_WAIT3
# define HAVE_WAIT_NOHANG
#endif

#ifndef	HAVE_UNISTD_H
int chdir ();
#endif
#ifndef	STDC_HEADERS
# ifndef sun			/* Sun has an incorrect decl in a header.  */
void exit (int) __attribute__ ((noreturn));
# endif
double atof ();
#endif

static void clean_jobserver (int status);
static void print_data_base (void);
static void print_version (void);
static void decode_switches (int argc, char **argv, int env);
static void decode_env_switches (char *envar, unsigned int len);
static const char *define_makeflags (int all, int makefile);
static char *quote_for_env (char *out, const char *in);
static void initialize_global_hash_tables (void);


/* The structure that describes an accepted command switch.  */

struct command_switch
  {
    int c;			/* The switch character.  */

    enum			/* Type of the value.  */
      {
	flag,			/* Turn int flag on.  */
	flag_off,		/* Turn int flag off.  */
	string,			/* One string per switch.  */
	filename,		/* A string containing a file name.  */
	positive_int,		/* A positive integer.  */
	floating,		/* A floating-point number (double).  */
	ignore			/* Ignored.  */
      } type;

    void *value_ptr;	/* Pointer to the value-holding variable.  */

    unsigned int env:1;		/* Can come from MAKEFLAGS.  */
    unsigned int toenv:1;	/* Should be put in MAKEFLAGS.  */
    unsigned int no_makefile:1;	/* Don't propagate when remaking makefiles.  */

    const void *noarg_value;	/* Pointer to value used if no arg given.  */
    const void *default_value;	/* Pointer to default value.  */

    char *long_name;		/* Long option name.  */
  };

/* True if C is a switch value that corresponds to a short option.  */

#define short_option(c) ((c) <= CHAR_MAX)

/* The structure used to hold the list of strings given
   in command switches of a type that takes string arguments.  */

struct stringlist
  {
    const char **list;	/* Nil-terminated list of strings.  */
    unsigned int idx;	/* Index into above.  */
    unsigned int max;	/* Number of pointers allocated.  */
  };


/* The recognized command switches.  */

/* Nonzero means do not print commands to be executed (-s).  */

int silent_flag;

/* Nonzero means just touch the files
   that would appear to need remaking (-t)  */

int touch_flag;

/* Nonzero means just print what commands would need to be executed,
   don't actually execute them (-n).  */

int just_print_flag;

/* Print debugging info (--debug).  */

static struct stringlist *db_flags;
static int debug_flag = 0;

int db_level = 0;

/* Output level (--verbosity).  */

static struct stringlist *verbosity_flags;

#ifdef WINDOWS32
/* Suspend make in main for a short time to allow debugger to attach */

int suspend_flag = 0;
#endif

/* Environment variables override makefile definitions.  */

int env_overrides = 0;

/* Nonzero means ignore status codes returned by commands
   executed to remake files.  Just treat them all as successful (-i).  */

int ignore_errors_flag = 0;

/* Nonzero means don't remake anything, just print the data base
   that results from reading the makefile (-p).  */

int print_data_base_flag = 0;

/* Nonzero means don't remake anything; just return a nonzero status
   if the specified targets are not up to date (-q).  */

int question_flag = 0;

/* Nonzero means do not use any of the builtin rules (-r) / variables (-R).  */

int no_builtin_rules_flag = 0;
int no_builtin_variables_flag = 0;

/* Nonzero means keep going even if remaking some file fails (-k).  */

int keep_going_flag;
int default_keep_going_flag = 0;

/* Nonzero means check symlink mtimes.  */

int check_symlink_flag = 0;

/* Nonzero means print directory before starting and when done (-w).  */

int print_directory_flag = 0;

/* Nonzero means ignore print_directory_flag and never print the directory.
   This is necessary because print_directory_flag is set implicitly.  */

int inhibit_print_directory_flag = 0;

/* Nonzero means print version information.  */

int print_version_flag = 0;

/* List of makefiles given with -f switches.  */

static struct stringlist *makefiles = 0;

/* Size of the stack when we started.  */

#ifdef SET_STACK_SIZE
struct rlimit stack_limit;
#endif


/* Number of job slots (commands that can be run at once).  */

unsigned int job_slots = 1;
unsigned int default_job_slots = 1;
static unsigned int master_job_slots = 0;

/* Value of job_slots that means no limit.  */

static unsigned int inf_jobs = 0;

/* File descriptors for the jobs pipe.  */

static struct stringlist *jobserver_fds = 0;

int job_fds[2] = { -1, -1 };
int job_rfd = -1;

/* Maximum load average at which multiple jobs will be run.
   Negative values mean unlimited, while zero means limit to
   zero load (which could be useful to start infinite jobs remotely
   but one at a time locally).  */
#ifndef NO_FLOAT
double max_load_average = -1.0;
double default_load_average = -1.0;
#else
int max_load_average = -1;
int default_load_average = -1;
#endif

/* List of directories given with -C switches.  */

static struct stringlist *directories = 0;

/* List of include directories given with -I switches.  */

static struct stringlist *include_directories = 0;

/* List of files given with -o switches.  */

static struct stringlist *old_files = 0;

/* List of files given with -W switches.  */

static struct stringlist *new_files = 0;

/* If nonzero, we should just print usage and exit.  */

static int print_usage_flag = 0;

/* If nonzero, we should print a warning message
   for each reference to an undefined variable.  */

int warn_undefined_variables_flag;

/* If nonzero, always build all targets, regardless of whether
   they appear out of date or not.  */

static int always_make_set = 0;
int always_make_flag = 0;

/* If nonzero, we're in the "try to rebuild makefiles" phase.  */

int rebuilding_makefiles = 0;

/* Remember the original value of the SHELL variable, from the environment.  */

struct variable shell_var;

/* This character introduces a command: it's the first char on the line.  */

char cmd_prefix = '\t';


/* The usage output.  We write it this way to make life easier for the
   translators, especially those trying to translate to right-to-left
   languages like Hebrew.  */

static const char *const usage[] =
  {
    N_("Options:\n"),
    N_("\
  -b, -m                      Ignored for compatibility.\n"),
    N_("\
  -B, --always-make           Unconditionally make all targets.\n"),
    N_("\
  -C DIRECTORY, --directory=DIRECTORY\n\
                              Change to DIRECTORY before doing anything.\n"),
    N_("\
  -d                          Print lots of debugging information.\n"),
    N_("\
  --debug[=FLAGS]             Print various types of debugging information.\n"),
    N_("\
  -e, --environment-overrides\n\
                              Environment variables override makefiles.\n"),
    N_("\
  -f FILE, --file=FILE, --makefile=FILE\n\
                              Read FILE as a makefile.\n"),
    N_("\
  -h, --help                  Print this message and exit.\n"),
    N_("\
  -i, --ignore-errors         Ignore errors from recipes.\n"),
    N_("\
  -I DIRECTORY, --include-dir=DIRECTORY\n\
                              Search DIRECTORY for included makefiles.\n"),
    N_("\
  -j [N], --jobs[=N]          Allow N jobs at once; infinite jobs with no arg.\n"),
    N_("\
  -k, --keep-going            Keep going when some targets can't be made.\n"),
    N_("\
  -l [N], --load-average[=N], --max-load[=N]\n\
                              Don't start multiple jobs unless load is below N.\n"),
    N_("\
  -L, --check-symlink-times   Use the latest mtime between symlinks and target.\n"),
    N_("\
  -n, --just-print, --dry-run, --recon\n\
                              Don't actually run any recipe; just print them.\n"),
    N_("\
  -o FILE, --old-file=FILE, --assume-old=FILE\n\
                              Consider FILE to be very old and don't remake it.\n"),
    N_("\
  -p, --print-data-base       Print make's internal database.\n"),
    N_("\
  -q, --question              Run no recipe; exit status says if up to date.\n"),
    N_("\
  -r, --no-builtin-rules      Disable the built-in implicit rules.\n"),
    N_("\
  -R, --no-builtin-variables  Disable the built-in variable settings.\n"),
    N_("\
  -s, --silent, --quiet       Don't echo recipes.\n"),
    N_("\
  -S, --no-keep-going, --stop\n\
                              Turns off -k.\n"),
    N_("\
  -t, --touch                 Touch targets instead of remaking them.\n"),
    N_("\
  -v, --version               Print the version number of make and exit.\n"),
    N_("\
  -w, --print-directory       Print the current directory.\n"),
    N_("\
  --no-print-directory        Turn off -w, even if it was turned on implicitly.\n"),
    N_("\
  -W FILE, --what-if=FILE, --new-file=FILE, --assume-new=FILE\n\
                              Consider FILE to be infinitely new.\n"),
    N_("\
  --warn-undefined-variables  Warn when an undefined variable is referenced.\n"),
    NULL
  };

/* The table of command switches.  */

static const struct command_switch switches[] =
  {
    { 'b', ignore, 0, 0, 0, 0, 0, 0, 0 },
    { 'B', flag, &always_make_set, 1, 1, 0, 0, 0, "always-make" },
    { 'C', filename, &directories, 0, 0, 0, 0, 0, "directory" },
    { 'd', flag, &debug_flag, 1, 1, 0, 0, 0, 0 },
    { CHAR_MAX+1, string, &db_flags, 1, 1, 0, "basic", 0, "debug" },
#ifdef WINDOWS32
    { 'D', flag, &suspend_flag, 1, 1, 0, 0, 0, "suspend-for-debug" },
#endif
    { 'e', flag, &env_overrides, 1, 1, 0, 0, 0, "environment-overrides", },
    { 'f', filename, &makefiles, 0, 0, 0, 0, 0, "file" },
    { 'h', flag, &print_usage_flag, 0, 0, 0, 0, 0, "help" },
    { 'i', flag, &ignore_errors_flag, 1, 1, 0, 0, 0, "ignore-errors" },
    { 'I', filename, &include_directories, 1, 1, 0, 0, 0,
      "include-dir" },
    { 'j', positive_int, &job_slots, 1, 1, 0, &inf_jobs, &default_job_slots,
      "jobs" },
    { CHAR_MAX+2, string, &jobserver_fds, 1, 1, 0, 0, 0, "jobserver-fds" },
    { 'k', flag, &keep_going_flag, 1, 1, 0, 0, &default_keep_going_flag,
      "keep-going" },
#ifndef NO_FLOAT
    { 'l', floating, &max_load_average, 1, 1, 0, &default_load_average,
      &default_load_average, "load-average" },
#else
    { 'l', positive_int, &max_load_average, 1, 1, 0, &default_load_average,
      &default_load_average, "load-average" },
#endif
    { 'L', flag, &check_symlink_flag, 1, 1, 0, 0, 0, "check-symlink-times" },
    { 'm', ignore, 0, 0, 0, 0, 0, 0, 0 },
    { 'n', flag, &just_print_flag, 1, 1, 1, 0, 0, "just-print" },
    { 'o', filename, &old_files, 0, 0, 0, 0, 0, "old-file" },
    { 'p', flag, &print_data_base_flag, 1, 1, 0, 0, 0, "print-data-base" },
    { 'q', flag, &question_flag, 1, 1, 1, 0, 0, "question" },
    { 'r', flag, &no_builtin_rules_flag, 1, 1, 0, 0, 0, "no-builtin-rules" },
    { 'R', flag, &no_builtin_variables_flag, 1, 1, 0, 0, 0,
      "no-builtin-variables" },
    { 's', flag, &silent_flag, 1, 1, 0, 0, 0, "silent" },
    { 'S', flag_off, &keep_going_flag, 1, 1, 0, 0, &default_keep_going_flag,
      "no-keep-going" },
    { 't', flag, &touch_flag, 1, 1, 1, 0, 0, "touch" },
    { 'v', flag, &print_version_flag, 1, 1, 0, 0, 0, "version" },
    { CHAR_MAX+3, string, &verbosity_flags, 1, 1, 0, 0, 0,
      "verbosity" },
    { 'w', flag, &print_directory_flag, 1, 1, 0, 0, 0, "print-directory" },
    { CHAR_MAX+4, flag, &inhibit_print_directory_flag, 1, 1, 0, 0, 0,
      "no-print-directory" },
    { 'W', filename, &new_files, 0, 0, 0, 0, 0, "what-if" },
    { CHAR_MAX+5, flag, &warn_undefined_variables_flag, 1, 1, 0, 0, 0,
      "warn-undefined-variables" },
    { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
  };

/* Secondary long names for options.  */

static struct option long_option_aliases[] =
  {
    { "quiet",		no_argument,		0, 's' },
    { "stop",		no_argument,		0, 'S' },
    { "new-file",	required_argument,	0, 'W' },
    { "assume-new",	required_argument,	0, 'W' },
    { "assume-old",	required_argument,	0, 'o' },
    { "max-load",	optional_argument,	0, 'l' },
    { "dry-run",	no_argument,		0, 'n' },
    { "recon",		no_argument,		0, 'n' },
    { "makefile",	required_argument,	0, 'f' },
  };

/* List of goal targets.  */

static struct dep *goals, *lastgoal;

/* List of variables which were defined on the command line
   (or, equivalently, in MAKEFLAGS).  */

struct command_variable
  {
    struct command_variable *next;
    struct variable *variable;
  };
static struct command_variable *command_variables;

/* The name we were invoked with.  */

char *program;

/* Our current directory before processing any -C options.  */

char *directory_before_chdir;

/* Our current directory after processing all -C options.  */

char *starting_directory;

/* Value of the MAKELEVEL variable at startup (or 0).  */

unsigned int makelevel;

/* Pointer to the value of the .DEFAULT_GOAL special variable.
   The value will be the name of the goal to remake if the command line
   does not override it.  It can be set by the makefile, or else it's
   the first target defined in the makefile whose name does not start
   with '.'.  */

struct variable * default_goal_var;

/* Pointer to structure for the file .DEFAULT
   whose commands are used for any file that has none of its own.
   This is zero if the makefiles do not define .DEFAULT.  */

struct file *default_file;

/* Nonzero if we have seen the magic `.POSIX' target.
   This turns on pedantic compliance with POSIX.2.  */

int posix_pedantic;

/* Nonzero if we have seen the '.SECONDEXPANSION' target.
   This turns on secondary expansion of prerequisites.  */

int second_expansion;

/* Nonzero if we have seen the `.NOTPARALLEL' target.
   This turns off parallel builds for this invocation of make.  */

int not_parallel;

/* Nonzero if some rule detected clock skew; we keep track so (a) we only
   print one warning about it during the run, and (b) we can print a final
   warning at the end of the run. */

int clock_skew_detected;

/* Mask of signals that are being caught with fatal_error_signal.  */

#ifdef	POSIX
sigset_t fatal_signal_set;
#else
# ifdef	HAVE_SIGSETMASK
int fatal_signal_mask;
# endif
#endif

#if !defined HAVE_BSD_SIGNAL && !defined bsd_signal
# if !defined HAVE_SIGACTION
#  define bsd_signal signal
# else
typedef RETSIGTYPE (*bsd_signal_ret_t) (int);

static bsd_signal_ret_t
bsd_signal (int sig, bsd_signal_ret_t func)
{
  struct sigaction act, oact;
  act.sa_handler = func;
  act.sa_flags = SA_RESTART;
  sigemptyset (&act.sa_mask);
  sigaddset (&act.sa_mask, sig);
  if (sigaction (sig, &act, &oact) != 0)
    return SIG_ERR;
  return oact.sa_handler;
}
# endif
#endif

static void
initialize_global_hash_tables (void)
{
  init_hash_global_variable_set ();
  strcache_init ();
  init_hash_files ();
  hash_init_directories ();
  hash_init_function_table ();
}

static const char *
expand_command_line_file (char *name)
{
  const char *cp;
  char *expanded = 0;

  if (name[0] == '\0')
    fatal (NILF, _("empty string invalid as file name"));

  if (name[0] == '~')
    {
      expanded = tilde_expand (name);
      if (expanded != 0)
	name = expanded;
    }

  /* This is also done in parse_file_seq, so this is redundant
     for names read from makefiles.  It is here for names passed
     on the command line.  */
  while (name[0] == '.' && name[1] == '/' && name[2] != '\0')
    {
      name += 2;
      while (*name == '/')
	/* Skip following slashes: ".//foo" is "foo", not "/foo".  */
	++name;
    }

  if (*name == '\0')
    {
      /* It was all slashes!  Move back to the dot and truncate
	 it after the first slash, so it becomes just "./".  */
      do
	--name;
      while (name[0] != '.');
      name[2] = '\0';
    }

  cp = strcache_add (name);

  if (expanded)
    free (expanded);

  return cp;
}

/* Toggle -d on receipt of SIGUSR1.  */

#ifdef SIGUSR1
static RETSIGTYPE
debug_signal_handler (int sig UNUSED)
{
  db_level = db_level ? DB_NONE : DB_BASIC;
}
#endif

static void
decode_debug_flags (void)
{
  const char **pp;

  if (debug_flag)
    db_level = DB_ALL;

  if (!db_flags)
    return;

  for (pp=db_flags->list; *pp; ++pp)
    {
      const char *p = *pp;

      while (1)
        {
          switch (tolower (p[0]))
            {
            case 'a':
              db_level |= DB_ALL;
              break;
            case 'b':
              db_level |= DB_BASIC;
              break;
            case 'i':
              db_level |= DB_BASIC | DB_IMPLICIT;
              break;
            case 'j':
              db_level |= DB_JOBS;
              break;
            case 'm':
              db_level |= DB_BASIC | DB_MAKEFILES;
              break;
            case 'v':
              db_level |= DB_BASIC | DB_VERBOSE;
              break;
            default:
              fatal (NILF, _("unknown debug level specification `%s'"), p);
            }

          while (*(++p) != '\0')
            if (*p == ',' || *p == ' ')
              break;

          if (*p == '\0')
            break;

          ++p;
        }
    }
}

#ifdef WINDOWS32
/*
 * HANDLE runtime exceptions by avoiding a requestor on the GUI. Capture
 * exception and print it to stderr instead.
 *
 * If ! DB_VERBOSE, just print a simple message and exit.
 * If DB_VERBOSE, print a more verbose message.
 * If compiled for DEBUG, let exception pass through to GUI so that
 *   debuggers can attach.
 */
LONG WINAPI
handle_runtime_exceptions( struct _EXCEPTION_POINTERS *exinfo )
{
  PEXCEPTION_RECORD exrec = exinfo->ExceptionRecord;
  LPSTR cmdline = GetCommandLine();
  LPSTR prg = strtok(cmdline, " ");
  CHAR errmsg[1024];
#ifdef USE_EVENT_LOG
  HANDLE hEventSource;
  LPTSTR lpszStrings[1];
#endif

  if (! ISDB (DB_VERBOSE))
    {
      sprintf(errmsg,
              _("%s: Interrupt/Exception caught (code = 0x%lx, addr = 0x%lx)\n"),
              prg, exrec->ExceptionCode, (DWORD)exrec->ExceptionAddress);
      fprintf(stderr, errmsg);
      exit(255);
    }

  sprintf(errmsg,
          _("\nUnhandled exception filter called from program %s\nExceptionCode = %lx\nExceptionFlags = %lx\nExceptionAddress = %lx\n"),
          prg, exrec->ExceptionCode, exrec->ExceptionFlags,
          (DWORD)exrec->ExceptionAddress);

  if (exrec->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
      && exrec->NumberParameters >= 2)
    sprintf(&errmsg[strlen(errmsg)],
            (exrec->ExceptionInformation[0]
             ? _("Access violation: write operation at address %lx\n")
             : _("Access violation: read operation at address %lx\n")),
            exrec->ExceptionInformation[1]);

  /* turn this on if we want to put stuff in the event log too */
#ifdef USE_EVENT_LOG
  hEventSource = RegisterEventSource(NULL, "GNU Make");
  lpszStrings[0] = errmsg;

  if (hEventSource != NULL)
    {
      ReportEvent(hEventSource,         /* handle of event source */
                  EVENTLOG_ERROR_TYPE,  /* event type */
                  0,                    /* event category */
                  0,                    /* event ID */
                  NULL,                 /* current user's SID */
                  1,                    /* strings in lpszStrings */
                  0,                    /* no bytes of raw data */
                  lpszStrings,          /* array of error strings */
                  NULL);                /* no raw data */

      (VOID) DeregisterEventSource(hEventSource);
    }
#endif

  /* Write the error to stderr too */
  fprintf(stderr, errmsg);

#ifdef DEBUG
  return EXCEPTION_CONTINUE_SEARCH;
#else
  exit(255);
  return (255); /* not reached */
#endif
}

/*
 * On WIN32 systems we don't have the luxury of a /bin directory that
 * is mapped globally to every drive mounted to the system. Since make could
 * be invoked from any drive, and we don't want to propogate /bin/sh
 * to every single drive. Allow ourselves a chance to search for
 * a value for default shell here (if the default path does not exist).
 */

int
find_and_set_default_shell (const char *token)
{
  int sh_found = 0;
  char *atoken = 0;
  char *search_token;
  char *tokend;
  PATH_VAR(sh_path);
  extern char *default_shell;

  if (!token)
    search_token = default_shell;
  else
    atoken = search_token = xstrdup (token);

  /* If the user explicitly requests the DOS cmd shell, obey that request.
     However, make sure that's what they really want by requiring the value
     of SHELL either equal, or have a final path element of, "cmd" or
     "cmd.exe" case-insensitive.  */
  tokend = search_token + strlen (search_token) - 3;
  if (((tokend == search_token
        || (tokend > search_token
            && (tokend[-1] == '/' || tokend[-1] == '\\')))
       && !strcasecmp (tokend, "cmd"))
      || ((tokend - 4 == search_token
           || (tokend - 4 > search_token
               && (tokend[-5] == '/' || tokend[-5] == '\\')))
          && !strcasecmp (tokend - 4, "cmd.exe"))) {
    batch_mode_shell = 1;
    unixy_shell = 0;
    sprintf (sh_path, "%s", search_token);
    default_shell = xstrdup (w32ify (sh_path, 0));
    DB (DB_VERBOSE, (_("find_and_set_shell() setting default_shell = %s\n"),
                     default_shell));
    sh_found = 1;
  } else if (!no_default_sh_exe &&
             (token == NULL || !strcmp (search_token, default_shell))) {
    /* no new information, path already set or known */
    sh_found = 1;
  } else if (file_exists_p (search_token)) {
    /* search token path was found */
    sprintf (sh_path, "%s", search_token);
    default_shell = xstrdup (w32ify (sh_path, 0));
    DB (DB_VERBOSE, (_("find_and_set_shell() setting default_shell = %s\n"),
                     default_shell));
    sh_found = 1;
  } else {
    char *p;
    struct variable *v = lookup_variable (STRING_SIZE_TUPLE ("PATH"));

    /* Search Path for shell */
    if (v && v->value) {
      char *ep;

      p  = v->value;
      ep = strchr (p, PATH_SEPARATOR_CHAR);

      while (ep && *ep) {
        *ep = '\0';

        if (dir_file_exists_p (p, search_token)) {
          sprintf (sh_path, "%s/%s", p, search_token);
          default_shell = xstrdup (w32ify (sh_path, 0));
          sh_found = 1;
          *ep = PATH_SEPARATOR_CHAR;

          /* terminate loop */
          p += strlen (p);
        } else {
          *ep = PATH_SEPARATOR_CHAR;
           p = ++ep;
        }

        ep = strchr (p, PATH_SEPARATOR_CHAR);
      }

      /* be sure to check last element of Path */
      if (p && *p && dir_file_exists_p (p, search_token)) {
          sprintf (sh_path, "%s/%s", p, search_token);
          default_shell = xstrdup (w32ify (sh_path, 0));
          sh_found = 1;
      }

      if (sh_found)
        DB (DB_VERBOSE,
            (_("find_and_set_shell() path search set default_shell = %s\n"),
             default_shell));
    }
  }

  /* naive test */
  if (!unixy_shell && sh_found &&
      (strstr (default_shell, "sh") || strstr (default_shell, "SH"))) {
    unixy_shell = 1;
    batch_mode_shell = 0;
  }

#ifdef BATCH_MODE_ONLY_SHELL
  batch_mode_shell = 1;
#endif

  if (atoken)
    free (atoken);

  return (sh_found);
}
#endif  /* WINDOWS32 */

#ifdef __MSDOS__
static void
msdos_return_to_initial_directory (void)
{
  if (directory_before_chdir)
    chdir (directory_before_chdir);
}
#endif  /* __MSDOS__ */

char *mktemp (char *template);
int mkstemp (char *template);

FILE *
open_tmpfile(char **name, const char *template)
{
#ifdef HAVE_FDOPEN
  int fd;
#endif

#if defined HAVE_MKSTEMP || defined HAVE_MKTEMP
# define TEMPLATE_LEN   strlen (template)
#else
# define TEMPLATE_LEN   L_tmpnam
#endif
  *name = xmalloc (TEMPLATE_LEN + 1);
  strcpy (*name, template);

#if defined HAVE_MKSTEMP && defined HAVE_FDOPEN
  /* It's safest to use mkstemp(), if we can.  */
  fd = mkstemp (*name);
  if (fd == -1)
    return 0;
  return fdopen (fd, "w");
#else
# ifdef HAVE_MKTEMP
  (void) mktemp (*name);
# else
  (void) tmpnam (*name);
# endif

# ifdef HAVE_FDOPEN
  /* Can't use mkstemp(), but guard against a race condition.  */
  fd = open (*name, O_CREAT|O_EXCL|O_WRONLY, 0600);
  if (fd == -1)
    return 0;
  return fdopen (fd, "w");
# else
  /* Not secure, but what can we do?  */
  return fopen (*name, "w");
# endif
#endif
}


#ifdef _AMIGA
int
main (int argc, char **argv)
#else
int
main (int argc, char **argv, char **envp)
#endif
{
  static char *stdin_nm = 0;
  int makefile_status = MAKE_SUCCESS;
  struct dep *read_makefiles;
  PATH_VAR (current_directory);
  unsigned int restarts = 0;
#ifdef WINDOWS32
  char *unix_path = NULL;
  char *windows32_path = NULL;

  SetUnhandledExceptionFilter(handle_runtime_exceptions);

  /* start off assuming we have no shell */
  unixy_shell = 0;
  no_default_sh_exe = 1;
#endif

#ifdef SET_STACK_SIZE
 /* Get rid of any avoidable limit on stack size.  */
  {
    struct rlimit rlim;

    /* Set the stack limit huge so that alloca does not fail.  */
    if (getrlimit (RLIMIT_STACK, &rlim) == 0
        && rlim.rlim_cur > 0 && rlim.rlim_cur < rlim.rlim_max)
      {
        stack_limit = rlim;
        rlim.rlim_cur = rlim.rlim_max;
        setrlimit (RLIMIT_STACK, &rlim);
      }
    else
      stack_limit.rlim_cur = 0;
  }
#endif

#ifdef HAVE_ATEXIT
  atexit (close_stdout);
#endif

  /* Needed for OS/2 */
  initialize_main(&argc, &argv);

  reading_file = 0;

#if defined (__MSDOS__) && !defined (_POSIX_SOURCE)
  /* Request the most powerful version of `system', to
     make up for the dumb default shell.  */
  __system_flags = (__system_redirect
		    | __system_use_shell
		    | __system_allow_multiple_cmds
		    | __system_allow_long_cmds
		    | __system_handle_null_commands
		    | __system_emulate_chdir);

#endif

  /* Set up gettext/internationalization support.  */
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

#ifdef	POSIX
  sigemptyset (&fatal_signal_set);
#define	ADD_SIG(sig)	sigaddset (&fatal_signal_set, sig)
#else
#ifdef	HAVE_SIGSETMASK
  fatal_signal_mask = 0;
#define	ADD_SIG(sig)	fatal_signal_mask |= sigmask (sig)
#else
#define	ADD_SIG(sig)
#endif
#endif

#define	FATAL_SIG(sig)							      \
  if (bsd_signal (sig, fatal_error_signal) == SIG_IGN)			      \
    bsd_signal (sig, SIG_IGN);						      \
  else									      \
    ADD_SIG (sig);

#ifdef SIGHUP
  FATAL_SIG (SIGHUP);
#endif
#ifdef SIGQUIT
  FATAL_SIG (SIGQUIT);
#endif
  FATAL_SIG (SIGINT);
  FATAL_SIG (SIGTERM);

#ifdef __MSDOS__
  /* Windows 9X delivers FP exceptions in child programs to their
     parent!  We don't want Make to die when a child divides by zero,
     so we work around that lossage by catching SIGFPE.  */
  FATAL_SIG (SIGFPE);
#endif

#ifdef	SIGDANGER
  FATAL_SIG (SIGDANGER);
#endif
#ifdef SIGXCPU
  FATAL_SIG (SIGXCPU);
#endif
#ifdef SIGXFSZ
  FATAL_SIG (SIGXFSZ);
#endif

#undef	FATAL_SIG

  /* Do not ignore the child-death signal.  This must be done before
     any children could possibly be created; otherwise, the wait
     functions won't work on systems with the SVR4 ECHILD brain
     damage, if our invoker is ignoring this signal.  */

#ifdef HAVE_WAIT_NOHANG
# if defined SIGCHLD
  (void) bsd_signal (SIGCHLD, SIG_DFL);
# endif
# if defined SIGCLD && SIGCLD != SIGCHLD
  (void) bsd_signal (SIGCLD, SIG_DFL);
# endif
#endif

  /* Make sure stdout is line-buffered.  */

#ifdef HAVE_SETVBUF
# ifdef SETVBUF_REVERSED
  setvbuf (stdout, _IOLBF, xmalloc (BUFSIZ), BUFSIZ);
# else	/* setvbuf not reversed.  */
  /* Some buggy systems lose if we pass 0 instead of allocating ourselves.  */
  setvbuf (stdout, 0, _IOLBF, BUFSIZ);
# endif	/* setvbuf reversed.  */
#elif HAVE_SETLINEBUF
  setlinebuf (stdout);
#endif	/* setlinebuf missing.  */

  /* Figure out where this program lives.  */

  if (argv[0] == 0)
    argv[0] = "";
  if (argv[0][0] == '\0')
    program = "make";
  else
    {
#ifdef VMS
      program = strrchr (argv[0], ']');
#else
      program = strrchr (argv[0], '/');
#endif
#if defined(__MSDOS__) || defined(__EMX__)
      if (program == 0)
	program = strrchr (argv[0], '\\');
      else
	{
	  /* Some weird environments might pass us argv[0] with
	     both kinds of slashes; we must find the rightmost.  */
	  char *p = strrchr (argv[0], '\\');
	  if (p && p > program)
	    program = p;
	}
      if (program == 0 && argv[0][1] == ':')
	program = argv[0] + 1;
#endif
#ifdef WINDOWS32
      if (program == 0)
        {
          /* Extract program from full path */
          int argv0_len;
          program = strrchr (argv[0], '\\');
          if (program)
            {
              argv0_len = strlen(program);
              if (argv0_len > 4 && streq (&program[argv0_len - 4], ".exe"))
                /* Remove .exe extension */
                program[argv0_len - 4] = '\0';
            }
        }
#endif
      if (program == 0)
	program = argv[0];
      else
	++program;
    }

  /* Set up to access user data (files).  */
  user_access ();

  initialize_global_hash_tables ();

  /* Figure out where we are.  */

#ifdef WINDOWS32
  if (getcwd_fs (current_directory, GET_PATH_MAX) == 0)
#else
  if (getcwd (current_directory, GET_PATH_MAX) == 0)
#endif
    {
#ifdef	HAVE_GETCWD
      perror_with_name ("getcwd", "");
#else
      error (NILF, "getwd: %s", current_directory);
#endif
      current_directory[0] = '\0';
      directory_before_chdir = 0;
    }
  else
    directory_before_chdir = xstrdup (current_directory);
#ifdef  __MSDOS__
  /* Make sure we will return to the initial directory, come what may.  */
  atexit (msdos_return_to_initial_directory);
#endif

  /* Initialize the special variables.  */
  define_variable (".VARIABLES", 10, "", o_default, 0)->special = 1;
  /* define_variable (".TARGETS", 8, "", o_default, 0)->special = 1; */
  define_variable (".RECIPEPREFIX", 13, "", o_default, 0)->special = 1;

  /* Set up .FEATURES */
  define_variable (".FEATURES", 9,
                   "target-specific order-only second-expansion else-if",
                   o_default, 0);
#ifndef NO_ARCHIVES
  do_variable_definition (NILF, ".FEATURES", "archives",
                          o_default, f_append, 0);
#endif
#ifdef MAKE_JOBSERVER
  do_variable_definition (NILF, ".FEATURES", "jobserver",
                          o_default, f_append, 0);
#endif
#ifdef MAKE_SYMLINKS
  do_variable_definition (NILF, ".FEATURES", "check-symlink",
                          o_default, f_append, 0);
#endif

  /* Read in variables from the environment.  It is important that this be
     done before $(MAKE) is figured out so its definitions will not be
     from the environment.  */

#ifndef _AMIGA
  {
    unsigned int i;

    for (i = 0; envp[i] != 0; ++i)
      {
        int do_not_define = 0;
        char *ep = envp[i];

        while (*ep != '\0' && *ep != '=')
          ++ep;
#ifdef WINDOWS32
        if (!unix_path && strneq(envp[i], "PATH=", 5))
          unix_path = ep+1;
        else if (!strnicmp(envp[i], "Path=", 5)) {
          do_not_define = 1; /* it gets defined after loop exits */
          if (!windows32_path)
            windows32_path = ep+1;
        }
#endif
        /* The result of pointer arithmetic is cast to unsigned int for
           machines where ptrdiff_t is a different size that doesn't widen
           the same.  */
        if (!do_not_define)
          {
            struct variable *v;

            v = define_variable (envp[i], (unsigned int) (ep - envp[i]),
                                 ep + 1, o_env, 1);
            /* Force exportation of every variable culled from the
               environment.  We used to rely on target_environment's
               v_default code to do this.  But that does not work for the
               case where an environment variable is redefined in a makefile
               with `override'; it should then still be exported, because it
               was originally in the environment.  */
            v->export = v_export;

            /* Another wrinkle is that POSIX says the value of SHELL set in
               the makefile won't change the value of SHELL given to
               subprocesses.  */
            if (streq (v->name, "SHELL"))
              {
#ifndef __MSDOS__
                v->export = v_noexport;
#endif
                shell_var.name = "SHELL";
                shell_var.length = 5;
                shell_var.value = xstrdup (ep + 1);
              }

            /* If MAKE_RESTARTS is set, remember it but don't export it.  */
            if (streq (v->name, "MAKE_RESTARTS"))
              {
                v->export = v_noexport;
                restarts = (unsigned int) atoi (ep + 1);
              }
          }
      }
  }
#ifdef WINDOWS32
    /* If we didn't find a correctly spelled PATH we define PATH as
     * either the first mispelled value or an empty string
     */
    if (!unix_path)
      define_variable("PATH", 4,
                      windows32_path ? windows32_path : "",
                      o_env, 1)->export = v_export;
#endif
#else /* For Amiga, read the ENV: device, ignoring all dirs */
    {
	BPTR env, file, old;
	char buffer[1024];
	int len;
	__aligned struct FileInfoBlock fib;

	env = Lock ("ENV:", ACCESS_READ);
	if (env)
	{
	    old = CurrentDir (DupLock(env));
	    Examine (env, &fib);

	    while (ExNext (env, &fib))
	    {
		if (fib.fib_DirEntryType < 0) /* File */
		{
		    /* Define an empty variable. It will be filled in
			variable_lookup(). Makes startup quite a bit
			faster. */
			define_variable (fib.fib_FileName,
			    strlen (fib.fib_FileName),
			"", o_env, 1)->export = v_export;
		}
	    }
	    UnLock (env);
	    UnLock(CurrentDir(old));
	}
    }
#endif

  /* Decode the switches.  */

  decode_env_switches (STRING_SIZE_TUPLE ("MAKEFLAGS"));
#if 0
  /* People write things like:
        MFLAGS="CC=gcc -pipe" "CFLAGS=-g"
     and we set the -p, -i and -e switches.  Doesn't seem quite right.  */
  decode_env_switches (STRING_SIZE_TUPLE ("MFLAGS"));
#endif
  decode_switches (argc, argv, 0);
#ifdef WINDOWS32
  if (suspend_flag) {
        fprintf(stderr, "%s (pid = %ld)\n", argv[0], GetCurrentProcessId());
        fprintf(stderr, _("%s is suspending for 30 seconds..."), argv[0]);
        Sleep(30 * 1000);
        fprintf(stderr, _("done sleep(30). Continuing.\n"));
  }
#endif

  decode_debug_flags ();

  /* Set always_make_flag if -B was given and we've not restarted already.  */
  always_make_flag = always_make_set && (restarts == 0);

  /* Print version information.  */
  if (print_version_flag || print_data_base_flag || db_level)
    {
      print_version ();

      /* `make --version' is supposed to just print the version and exit.  */
      if (print_version_flag)
        die (0);
    }

#ifndef VMS
  /* Set the "MAKE_COMMAND" variable to the name we were invoked with.
     (If it is a relative pathname with a slash, prepend our directory name
     so the result will run the same program regardless of the current dir.
     If it is a name with no slash, we can only hope that PATH did not
     find it in the current directory.)  */
#ifdef WINDOWS32
  /*
   * Convert from backslashes to forward slashes for
   * programs like sh which don't like them. Shouldn't
   * matter if the path is one way or the other for
   * CreateProcess().
   */
  if (strpbrk(argv[0], "/:\\") ||
      strstr(argv[0], "..") ||
      strneq(argv[0], "//", 2))
    argv[0] = xstrdup(w32ify(argv[0],1));
#else /* WINDOWS32 */
#if defined (__MSDOS__) || defined (__EMX__)
  if (strchr (argv[0], '\\'))
    {
      char *p;

      argv[0] = xstrdup (argv[0]);
      for (p = argv[0]; *p; p++)
	if (*p == '\\')
	  *p = '/';
    }
  /* If argv[0] is not in absolute form, prepend the current
     directory.  This can happen when Make is invoked by another DJGPP
     program that uses a non-absolute name.  */
  if (current_directory[0] != '\0'
      && argv[0] != 0
      && (argv[0][0] != '/' && (argv[0][0] == '\0' || argv[0][1] != ':'))
# ifdef __EMX__
      /* do not prepend cwd if argv[0] contains no '/', e.g. "make" */
      && (strchr (argv[0], '/') != 0 || strchr (argv[0], '\\') != 0)
# endif
      )
    argv[0] = xstrdup (concat (3, current_directory, "/", argv[0]));
#else  /* !__MSDOS__ */
  if (current_directory[0] != '\0'
      && argv[0] != 0 && argv[0][0] != '/' && strchr (argv[0], '/') != 0
#ifdef HAVE_DOS_PATHS
      && (argv[0][0] != '\\' && (!argv[0][0] || argv[0][1] != ':'))
      && strchr (argv[0], '\\') != 0
#endif
      )
    argv[0] = xstrdup (concat (3, current_directory, "/", argv[0]));
#endif /* !__MSDOS__ */
#endif /* WINDOWS32 */
#endif

  /* The extra indirection through $(MAKE_COMMAND) is done
     for hysterical raisins.  */
  (void) define_variable ("MAKE_COMMAND", 12, argv[0], o_default, 0);
  (void) define_variable ("MAKE", 4, "$(MAKE_COMMAND)", o_default, 1);

  if (command_variables != 0)
    {
      struct command_variable *cv;
      struct variable *v;
      unsigned int len = 0;
      char *value, *p;

      /* Figure out how much space will be taken up by the command-line
	 variable definitions.  */
      for (cv = command_variables; cv != 0; cv = cv->next)
	{
	  v = cv->variable;
	  len += 2 * strlen (v->name);
	  if (! v->recursive)
	    ++len;
	  ++len;
	  len += 2 * strlen (v->value);
	  ++len;
	}

      /* Now allocate a buffer big enough and fill it.  */
      p = value = alloca (len);
      for (cv = command_variables; cv != 0; cv = cv->next)
	{
	  v = cv->variable;
	  p = quote_for_env (p, v->name);
	  if (! v->recursive)
	    *p++ = ':';
	  *p++ = '=';
	  p = quote_for_env (p, v->value);
	  *p++ = ' ';
	}
      p[-1] = '\0';		/* Kill the final space and terminate.  */

      /* Define an unchangeable variable with a name that no POSIX.2
	 makefile could validly use for its own variable.  */
      (void) define_variable ("-*-command-variables-*-", 23,
			      value, o_automatic, 0);

      /* Define the variable; this will not override any user definition.
         Normally a reference to this variable is written into the value of
         MAKEFLAGS, allowing the user to override this value to affect the
         exported value of MAKEFLAGS.  In POSIX-pedantic mode, we cannot
         allow the user's setting of MAKEOVERRIDES to affect MAKEFLAGS, so
         a reference to this hidden variable is written instead. */
      (void) define_variable ("MAKEOVERRIDES", 13,
			      "${-*-command-variables-*-}", o_env, 1);
    }

  /* If there were -C flags, move ourselves about.  */
  if (directories != 0)
    {
      unsigned int i;
      for (i = 0; directories->list[i] != 0; ++i)
        {
          const char *dir = directories->list[i];
#ifdef WINDOWS32
          /* WINDOWS32 chdir() doesn't work if the directory has a trailing '/'
             But allow -C/ just in case someone wants that.  */
          {
            char *p = dir + strlen (dir) - 1;
            while (p > dir && (p[0] == '/' || p[0] == '\\'))
              --p;
            p[1] = '\0';
          }
#endif
          if (chdir (dir) < 0)
            pfatal_with_name (dir);
        }
    }

#ifdef WINDOWS32
  /*
   * THIS BLOCK OF CODE MUST COME AFTER chdir() CALL ABOVE IN ORDER
   * TO NOT CONFUSE THE DEPENDENCY CHECKING CODE IN implicit.c.
   *
   * The functions in dir.c can incorrectly cache information for "."
   * before we have changed directory and this can cause file
   * lookups to fail because the current directory (.) was pointing
   * at the wrong place when it was first evaluated.
   */
   no_default_sh_exe = !find_and_set_default_shell(NULL);

#endif /* WINDOWS32 */
  /* Figure out the level of recursion.  */
  {
    struct variable *v = lookup_variable (STRING_SIZE_TUPLE (MAKELEVEL_NAME));
    if (v != 0 && v->value[0] != '\0' && v->value[0] != '-')
      makelevel = (unsigned int) atoi (v->value);
    else
      makelevel = 0;
  }

  /* Except under -s, always do -w in sub-makes and under -C.  */
  if (!silent_flag && (directories != 0 || makelevel > 0))
    print_directory_flag = 1;

  /* Let the user disable that with --no-print-directory.  */
  if (inhibit_print_directory_flag)
    print_directory_flag = 0;

  /* If -R was given, set -r too (doesn't make sense otherwise!)  */
  if (no_builtin_variables_flag)
    no_builtin_rules_flag = 1;

  /* Construct the list of include directories to search.  */

  construct_include_path (include_directories == 0
                          ? 0 : include_directories->list);

  /* Figure out where we are now, after chdir'ing.  */
  if (directories == 0)
    /* We didn't move, so we're still in the same place.  */
    starting_directory = current_directory;
  else
    {
#ifdef WINDOWS32
      if (getcwd_fs (current_directory, GET_PATH_MAX) == 0)
#else
      if (getcwd (current_directory, GET_PATH_MAX) == 0)
#endif
	{
#ifdef	HAVE_GETCWD
	  perror_with_name ("getcwd", "");
#else
	  error (NILF, "getwd: %s", current_directory);
#endif
	  starting_directory = 0;
	}
      else
	starting_directory = current_directory;
    }

  (void) define_variable ("CURDIR", 6, current_directory, o_file, 0);

  /* Read any stdin makefiles into temporary files.  */

  if (makefiles != 0)
    {
      unsigned int i;
      for (i = 0; i < makefiles->idx; ++i)
	if (makefiles->list[i][0] == '-' && makefiles->list[i][1] == '\0')
	  {
	    /* This makefile is standard input.  Since we may re-exec
	       and thus re-read the makefiles, we read standard input
	       into a temporary file and read from that.  */
	    FILE *outfile;
            char *template, *tmpdir;

            if (stdin_nm)
              fatal (NILF, _("Makefile from standard input specified twice."));

#ifdef VMS
# define DEFAULT_TMPDIR     "sys$scratch:"
#else
# ifdef P_tmpdir
#  define DEFAULT_TMPDIR    P_tmpdir
# else
#  define DEFAULT_TMPDIR    "/tmp"
# endif
#endif
#define DEFAULT_TMPFILE     "GmXXXXXX"

	    if (((tmpdir = getenv ("TMPDIR")) == NULL || *tmpdir == '\0')
#if defined (__MSDOS__) || defined (WINDOWS32) || defined (__EMX__)
                /* These are also used commonly on these platforms.  */
                && ((tmpdir = getenv ("TEMP")) == NULL || *tmpdir == '\0')
                && ((tmpdir = getenv ("TMP")) == NULL || *tmpdir == '\0')
#endif
               )
	      tmpdir = DEFAULT_TMPDIR;

            template = alloca (strlen (tmpdir) + sizeof (DEFAULT_TMPFILE) + 1);
	    strcpy (template, tmpdir);

#ifdef HAVE_DOS_PATHS
	    if (strchr ("/\\", template[strlen (template) - 1]) == NULL)
	      strcat (template, "/");
#else
# ifndef VMS
	    if (template[strlen (template) - 1] != '/')
	      strcat (template, "/");
# endif /* !VMS */
#endif /* !HAVE_DOS_PATHS */

	    strcat (template, DEFAULT_TMPFILE);
	    outfile = open_tmpfile (&stdin_nm, template);
	    if (outfile == 0)
	      pfatal_with_name (_("fopen (temporary file)"));
	    while (!feof (stdin) && ! ferror (stdin))
	      {
		char buf[2048];
		unsigned int n = fread (buf, 1, sizeof (buf), stdin);
		if (n > 0 && fwrite (buf, 1, n, outfile) != n)
		  pfatal_with_name (_("fwrite (temporary file)"));
	      }
	    fclose (outfile);

	    /* Replace the name that read_all_makefiles will
	       see with the name of the temporary file.  */
            makefiles->list[i] = strcache_add (stdin_nm);

	    /* Make sure the temporary file will not be remade.  */
            {
              struct file *f = enter_file (strcache_add (stdin_nm));
              f->updated = 1;
              f->update_status = 0;
              f->command_state = cs_finished;
              /* Can't be intermediate, or it'll be removed too early for
                 make re-exec.  */
              f->intermediate = 0;
              f->dontcare = 0;
            }
	  }
    }

#ifndef __EMX__ /* Don't use a SIGCHLD handler for OS/2 */
#if defined(MAKE_JOBSERVER) || !defined(HAVE_WAIT_NOHANG)
  /* Set up to handle children dying.  This must be done before
     reading in the makefiles so that `shell' function calls will work.

     If we don't have a hanging wait we have to fall back to old, broken
     functionality here and rely on the signal handler and counting
     children.

     If we're using the jobs pipe we need a signal handler so that
     SIGCHLD is not ignored; we need it to interrupt the read(2) of the
     jobserver pipe in job.c if we're waiting for a token.

     If none of these are true, we don't need a signal handler at all.  */
  {
    RETSIGTYPE child_handler (int sig);
# if defined SIGCHLD
    bsd_signal (SIGCHLD, child_handler);
# endif
# if defined SIGCLD && SIGCLD != SIGCHLD
    bsd_signal (SIGCLD, child_handler);
# endif
  }
#endif
#endif

  /* Let the user send us SIGUSR1 to toggle the -d flag during the run.  */
#ifdef SIGUSR1
  bsd_signal (SIGUSR1, debug_signal_handler);
#endif

  /* Define the initial list of suffixes for old-style rules.  */

  set_default_suffixes ();

  /* Define the file rules for the built-in suffix rules.  These will later
     be converted into pattern rules.  We used to do this in
     install_default_implicit_rules, but since that happens after reading
     makefiles, it results in the built-in pattern rules taking precedence
     over makefile-specified suffix rules, which is wrong.  */

  install_default_suffix_rules ();

  /* Define some internal and special variables.  */

  define_automatic_variables ();

  /* Set up the MAKEFLAGS and MFLAGS variables
     so makefiles can look at them.  */

  define_makeflags (0, 0);

  /* Define the default variables.  */
  define_default_variables ();

  default_file = enter_file (strcache_add (".DEFAULT"));

  default_goal_var = define_variable (".DEFAULT_GOAL", 13, "", o_file, 0);

  /* Read all the makefiles.  */

  read_makefiles
    = read_all_makefiles (makefiles == 0 ? 0 : makefiles->list);

#ifdef WINDOWS32
  /* look one last time after reading all Makefiles */
  if (no_default_sh_exe)
    no_default_sh_exe = !find_and_set_default_shell(NULL);
#endif /* WINDOWS32 */

#if defined (__MSDOS__) || defined (__EMX__)
  /* We need to know what kind of shell we will be using.  */
  {
    extern int _is_unixy_shell (const char *_path);
    struct variable *shv = lookup_variable (STRING_SIZE_TUPLE ("SHELL"));
    extern int unixy_shell;
    extern char *default_shell;

    if (shv && *shv->value)
      {
	char *shell_path = recursively_expand(shv);

	if (shell_path && _is_unixy_shell (shell_path))
	  unixy_shell = 1;
	else
	  unixy_shell = 0;
	if (shell_path)
	  default_shell = shell_path;
      }
  }
#endif /* __MSDOS__ || __EMX__ */

  /* Decode switches again, in case the variables were set by the makefile.  */
  decode_env_switches (STRING_SIZE_TUPLE ("MAKEFLAGS"));
#if 0
  decode_env_switches (STRING_SIZE_TUPLE ("MFLAGS"));
#endif

#if defined (__MSDOS__) || defined (__EMX__)
  if (job_slots != 1
# ifdef __EMX__
      && _osmode != OS2_MODE /* turn off -j if we are in DOS mode */
# endif
      )
    {
      error (NILF,
             _("Parallel jobs (-j) are not supported on this platform."));
      error (NILF, _("Resetting to single job (-j1) mode."));
      job_slots = 1;
    }
#endif

#ifdef MAKE_JOBSERVER
  /* If the jobserver-fds option is seen, make sure that -j is reasonable.  */

  if (jobserver_fds)
    {
      const char *cp;
      unsigned int ui;

      for (ui=1; ui < jobserver_fds->idx; ++ui)
        if (!streq (jobserver_fds->list[0], jobserver_fds->list[ui]))
          fatal (NILF, _("internal error: multiple --jobserver-fds options"));

      /* Now parse the fds string and make sure it has the proper format.  */

      cp = jobserver_fds->list[0];

      if (sscanf (cp, "%d,%d", &job_fds[0], &job_fds[1]) != 2)
        fatal (NILF,
               _("internal error: invalid --jobserver-fds string `%s'"), cp);

      DB (DB_JOBS,
          (_("Jobserver client (fds %d,%d)\n"), job_fds[0], job_fds[1]));

      /* The combination of a pipe + !job_slots means we're using the
         jobserver.  If !job_slots and we don't have a pipe, we can start
         infinite jobs.  If we see both a pipe and job_slots >0 that means the
         user set -j explicitly.  This is broken; in this case obey the user
         (ignore the jobserver pipe for this make) but print a message.  */

      if (job_slots > 0)
        error (NILF,
               _("warning: -jN forced in submake: disabling jobserver mode."));

      /* Create a duplicate pipe, that will be closed in the SIGCHLD
         handler.  If this fails with EBADF, the parent has closed the pipe
         on us because it didn't think we were a submake.  If so, print a
         warning then default to -j1.  */

      else if ((job_rfd = dup (job_fds[0])) < 0)
        {
          if (errno != EBADF)
            pfatal_with_name (_("dup jobserver"));

          error (NILF,
                 _("warning: jobserver unavailable: using -j1.  Add `+' to parent make rule."));
          job_slots = 1;
        }

      if (job_slots > 0)
        {
          close (job_fds[0]);
          close (job_fds[1]);
          job_fds[0] = job_fds[1] = -1;
          free (jobserver_fds->list);
          free (jobserver_fds);
          jobserver_fds = 0;
        }
    }

  /* If we have >1 slot but no jobserver-fds, then we're a top-level make.
     Set up the pipe and install the fds option for our children.  */

  if (job_slots > 1)
    {
      char *cp;
      char c = '+';

      if (pipe (job_fds) < 0 || (job_rfd = dup (job_fds[0])) < 0)
	pfatal_with_name (_("creating jobs pipe"));

      /* Every make assumes that it always has one job it can run.  For the
         submakes it's the token they were given by their parent.  For the
         top make, we just subtract one from the number the user wants.  We
         want job_slots to be 0 to indicate we're using the jobserver.  */

      master_job_slots = job_slots;

      while (--job_slots)
        {
          int r;

          EINTRLOOP (r, write (job_fds[1], &c, 1));
          if (r != 1)
            pfatal_with_name (_("init jobserver pipe"));
        }

      /* Fill in the jobserver_fds struct for our children.  */

      cp = xmalloc ((sizeof ("1024")*2)+1);
      sprintf (cp, "%d,%d", job_fds[0], job_fds[1]);

      jobserver_fds = (struct stringlist *)
                        xmalloc (sizeof (struct stringlist));
      jobserver_fds->list = xmalloc (sizeof (char *));
      jobserver_fds->list[0] = cp;
      jobserver_fds->idx = 1;
      jobserver_fds->max = 1;
    }
#endif

#ifndef MAKE_SYMLINKS
  if (check_symlink_flag)
    {
      error (NILF, _("Symbolic links not supported: disabling -L."));
      check_symlink_flag = 0;
    }
#endif

  /* Set up MAKEFLAGS and MFLAGS again, so they will be right.  */

  define_makeflags (1, 0);

  /* Make each `struct dep' point at the `struct file' for the file
     depended on.  Also do magic for special targets.  */

  snap_deps ();

  /* Convert old-style suffix rules to pattern rules.  It is important to
     do this before installing the built-in pattern rules below, so that
     makefile-specified suffix rules take precedence over built-in pattern
     rules.  */

  convert_to_pattern ();

  /* Install the default implicit pattern rules.
     This used to be done before reading the makefiles.
     But in that case, built-in pattern rules were in the chain
     before user-defined ones, so they matched first.  */

  install_default_implicit_rules ();

  /* Compute implicit rule limits.  */

  count_implicit_rule_limits ();

  /* Construct the listings of directories in VPATH lists.  */

  build_vpath_lists ();

  /* Mark files given with -o flags as very old and as having been updated
     already, and files given with -W flags as brand new (time-stamp as far
     as possible into the future).  If restarts is set we'll do -W later.  */

  if (old_files != 0)
    {
      const char **p;
      for (p = old_files->list; *p != 0; ++p)
        {
          struct file *f = enter_file (*p);
          f->last_mtime = f->mtime_before_update = OLD_MTIME;
          f->updated = 1;
          f->update_status = 0;
          f->command_state = cs_finished;
        }
    }

  if (!restarts && new_files != 0)
    {
      const char **p;
      for (p = new_files->list; *p != 0; ++p)
	{
	  struct file *f = enter_file (*p);
	  f->last_mtime = f->mtime_before_update = NEW_MTIME;
	}
    }

  /* Initialize the remote job module.  */
  remote_setup ();

  if (read_makefiles != 0)
    {
      /* Update any makefiles if necessary.  */

      FILE_TIMESTAMP *makefile_mtimes = 0;
      unsigned int mm_idx = 0;
      char **nargv;
      int nargc;
      int orig_db_level = db_level;
      int status;

      if (! ISDB (DB_MAKEFILES))
        db_level = DB_NONE;

      DB (DB_BASIC, (_("Updating makefiles....\n")));

      /* Remove any makefiles we don't want to try to update.
	 Also record the current modtimes so we can compare them later.  */
      {
	register struct dep *d, *last;
	last = 0;
	d = read_makefiles;
	while (d != 0)
	  {
	    struct file *f = d->file;
	    if (f->double_colon)
	      for (f = f->double_colon; f != NULL; f = f->prev)
		{
		  if (f->deps == 0 && f->cmds != 0)
		    {
		      /* This makefile is a :: target with commands, but
			 no dependencies.  So, it will always be remade.
			 This might well cause an infinite loop, so don't
			 try to remake it.  (This will only happen if
			 your makefiles are written exceptionally
			 stupidly; but if you work for Athena, that's how
			 you write your makefiles.)  */

		      DB (DB_VERBOSE,
                          (_("Makefile `%s' might loop; not remaking it.\n"),
                           f->name));

		      if (last == 0)
			read_makefiles = d->next;
		      else
			last->next = d->next;

		      /* Free the storage.  */
                      free_dep (d);

		      d = last == 0 ? read_makefiles : last->next;

		      break;
		    }
		}
	    if (f == NULL || !f->double_colon)
	      {
                makefile_mtimes = xrealloc (makefile_mtimes,
                                            (mm_idx+1)
                                            * sizeof (FILE_TIMESTAMP));
		makefile_mtimes[mm_idx++] = file_mtime_no_search (d->file);
		last = d;
		d = d->next;
	      }
	  }
      }

      /* Set up `MAKEFLAGS' specially while remaking makefiles.  */
      define_makeflags (1, 1);

      rebuilding_makefiles = 1;
      status = update_goal_chain (read_makefiles);
      rebuilding_makefiles = 0;

      switch (status)
	{
	case 1:
          /* The only way this can happen is if the user specified -q and asked
           * for one of the makefiles to be remade as a target on the command
           * line.  Since we're not actually updating anything with -q we can
           * treat this as "did nothing".
           */

	case -1:
	  /* Did nothing.  */
	  break;

	case 2:
	  /* Failed to update.  Figure out if we care.  */
	  {
	    /* Nonzero if any makefile was successfully remade.  */
	    int any_remade = 0;
	    /* Nonzero if any makefile we care about failed
	       in updating or could not be found at all.  */
	    int any_failed = 0;
	    unsigned int i;
            struct dep *d;

	    for (i = 0, d = read_makefiles; d != 0; ++i, d = d->next)
              {
                /* Reset the considered flag; we may need to look at the file
                   again to print an error.  */
                d->file->considered = 0;

                if (d->file->updated)
                  {
                    /* This makefile was updated.  */
                    if (d->file->update_status == 0)
                      {
                        /* It was successfully updated.  */
                        any_remade |= (file_mtime_no_search (d->file)
                                       != makefile_mtimes[i]);
                      }
                    else if (! (d->changed & RM_DONTCARE))
                      {
                        FILE_TIMESTAMP mtime;
                        /* The update failed and this makefile was not
                           from the MAKEFILES variable, so we care.  */
                        error (NILF, _("Failed to remake makefile `%s'."),
                               d->file->name);
                        mtime = file_mtime_no_search (d->file);
                        any_remade |= (mtime != NONEXISTENT_MTIME
                                       && mtime != makefile_mtimes[i]);
                        makefile_status = MAKE_FAILURE;
                      }
                  }
                else
                  /* This makefile was not found at all.  */
                  if (! (d->changed & RM_DONTCARE))
                    {
                      /* This is a makefile we care about.  See how much.  */
                      if (d->changed & RM_INCLUDED)
                        /* An included makefile.  We don't need
                           to die, but we do want to complain.  */
                        error (NILF,
                               _("Included makefile `%s' was not found."),
                               dep_name (d));
                      else
                        {
                          /* A normal makefile.  We must die later.  */
                          error (NILF, _("Makefile `%s' was not found"),
                                 dep_name (d));
                          any_failed = 1;
                        }
                    }
              }
            /* Reset this to empty so we get the right error message below.  */
            read_makefiles = 0;

	    if (any_remade)
	      goto re_exec;
	    if (any_failed)
	      die (2);
            break;
	  }

	case 0:
	re_exec:
	  /* Updated successfully.  Re-exec ourselves.  */

	  remove_intermediates (0);

	  if (print_data_base_flag)
	    print_data_base ();

	  log_working_directory (0);

          clean_jobserver (0);

	  if (makefiles != 0)
	    {
	      /* These names might have changed.  */
	      int i, j = 0;
	      for (i = 1; i < argc; ++i)
		if (strneq (argv[i], "-f", 2)) /* XXX */
		  {
		    if (argv[i][2] == '\0')
                      /* This cast is OK since we never modify argv.  */
		      argv[++i] = (char *) makefiles->list[j];
		    else
		      argv[i] = xstrdup (concat (2, "-f", makefiles->list[j]));
		    ++j;
		  }
	    }

          /* Add -o option for the stdin temporary file, if necessary.  */
          nargc = argc;
          if (stdin_nm)
            {
              nargv = xmalloc ((nargc + 2) * sizeof (char *));
              memcpy (nargv, argv, argc * sizeof (char *));
              nargv[nargc++] = xstrdup (concat (2, "-o", stdin_nm));
              nargv[nargc] = 0;
            }
          else
            nargv = argv;

	  if (directories != 0 && directories->idx > 0)
	    {
	      int bad = 1;
	      if (directory_before_chdir != 0)
		{
		  if (chdir (directory_before_chdir) < 0)
		      perror_with_name ("chdir", "");
		  else
		    bad = 0;
		}
	      if (bad)
		fatal (NILF, _("Couldn't change back to original directory."));
	    }

          ++restarts;

          /* Reset makeflags in case they were changed.  */
          {
            const char *pv = define_makeflags (1, 1);
            char *p = alloca (sizeof ("MAKEFLAGS=") + strlen (pv) + 1);
            sprintf (p, "MAKEFLAGS=%s", pv);
            putenv (p);
          }

	  if (ISDB (DB_BASIC))
	    {
	      char **p;
	      printf (_("Re-executing[%u]:"), restarts);
	      for (p = nargv; *p != 0; ++p)
		printf (" %s", *p);
	      putchar ('\n');
	    }

#ifndef _AMIGA
          {
            char **p;
            for (p = environ; *p != 0; ++p)
              {
                if (strneq (*p, MAKELEVEL_NAME, MAKELEVEL_LENGTH)
                    && (*p)[MAKELEVEL_LENGTH] == '=')
                  {
                    *p = alloca (40);
                    sprintf (*p, "%s=%u", MAKELEVEL_NAME, makelevel);
                  }
                if (strneq (*p, "MAKE_RESTARTS=", 14))
                  {
                    *p = alloca (40);
                    sprintf (*p, "MAKE_RESTARTS=%u", restarts);
                    restarts = 0;
                  }
              }
          }
#else /* AMIGA */
	  {
	    char buffer[256];

            sprintf (buffer, "%u", makelevel);
            SetVar (MAKELEVEL_NAME, buffer, -1, GVF_GLOBAL_ONLY);

            sprintf (buffer, "%u", restarts);
            SetVar ("MAKE_RESTARTS", buffer, -1, GVF_GLOBAL_ONLY);
            restarts = 0;
	  }
#endif

          /* If we didn't set the restarts variable yet, add it.  */
          if (restarts)
            {
              char *b = alloca (40);
              sprintf (b, "MAKE_RESTARTS=%u", restarts);
              putenv (b);
            }

	  fflush (stdout);
	  fflush (stderr);

          /* Close the dup'd jobserver pipe if we opened one.  */
          if (job_rfd >= 0)
            close (job_rfd);

#ifdef _AMIGA
	  exec_command (nargv);
	  exit (0);
#elif defined (__EMX__)
	  {
	    /* It is not possible to use execve() here because this
	       would cause the parent process to be terminated with
	       exit code 0 before the child process has been terminated.
	       Therefore it may be the best solution simply to spawn the
	       child process including all file handles and to wait for its
	       termination. */
	    int pid;
	    int status;
	    pid = child_execute_job (0, 1, nargv, environ);

	    /* is this loop really necessary? */
	    do {
	      pid = wait (&status);
	    } while (pid <= 0);
	    /* use the exit code of the child process */
	    exit (WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
	  }
#else
	  exec_command (nargv, environ);
#endif
	  /* NOTREACHED */

	default:
#define BOGUS_UPDATE_STATUS 0
	  assert (BOGUS_UPDATE_STATUS);
	  break;
	}

      db_level = orig_db_level;

      /* Free the makefile mtimes (if we allocated any).  */
      if (makefile_mtimes)
        free (makefile_mtimes);
    }

  /* Set up `MAKEFLAGS' again for the normal targets.  */
  define_makeflags (1, 0);

  /* Set always_make_flag if -B was given.  */
  always_make_flag = always_make_set;

  /* If restarts is set we haven't set up -W files yet, so do that now.  */
  if (restarts && new_files != 0)
    {
      const char **p;
      for (p = new_files->list; *p != 0; ++p)
	{
	  struct file *f = enter_file (*p);
	  f->last_mtime = f->mtime_before_update = NEW_MTIME;
	}
    }

  /* If there is a temp file from reading a makefile from stdin, get rid of
     it now.  */
  if (stdin_nm && unlink (stdin_nm) < 0 && errno != ENOENT)
    perror_with_name (_("unlink (temporary file): "), stdin_nm);

  /* If there were no command-line goals, use the default.  */
  if (goals == 0)
    {
      char *p;

      if (default_goal_var->recursive)
        p = variable_expand (default_goal_var->value);
      else
        {
          p = variable_buffer_output (variable_buffer, default_goal_var->value,
                                      strlen (default_goal_var->value));
          *p = '\0';
          p = variable_buffer;
        }

      if (*p != '\0')
        {
          struct file *f = lookup_file (p);

          /* If .DEFAULT_GOAL is a non-existent target, enter it into the
             table and let the standard logic sort it out. */
          if (f == 0)
            {
              struct nameseq *ns;

              ns = parse_file_seq (&p, sizeof (struct nameseq), '\0', NULL, 0);
              if (ns)
                {
                  /* .DEFAULT_GOAL should contain one target. */
                  if (ns->next != 0)
                    fatal (NILF, _(".DEFAULT_GOAL contains more than one target"));

                  f = enter_file (strcache_add (ns->name));

                  ns->name = 0; /* It was reused by enter_file(). */
                  free_ns_chain (ns);
                }
            }

          if (f)
            {
              goals = alloc_dep ();
              goals->file = f;
            }
        }
    }
  else
    lastgoal->next = 0;


  if (!goals)
    {
      if (read_makefiles == 0)
        fatal (NILF, _("No targets specified and no makefile found"));

      fatal (NILF, _("No targets"));
    }

  /* Update the goals.  */

  DB (DB_BASIC, (_("Updating goal targets....\n")));

  {
    int status;

    switch (update_goal_chain (goals))
    {
      case -1:
        /* Nothing happened.  */
      case 0:
        /* Updated successfully.  */
        status = makefile_status;
        break;
      case 1:
        /* We are under -q and would run some commands.  */
        status = MAKE_TROUBLE;
        break;
      case 2:
        /* Updating failed.  POSIX.2 specifies exit status >1 for this;
           but in VMS, there is only success and failure.  */
        status = MAKE_FAILURE;
        break;
      default:
        abort ();
    }

    /* If we detected some clock skew, generate one last warning */
    if (clock_skew_detected)
      error (NILF,
             _("warning:  Clock skew detected.  Your build may be incomplete."));

    /* Exit.  */
    die (status);
  }

  /* NOTREACHED */
  return 0;
}

/* Parsing of arguments, decoding of switches.  */

static char options[1 + sizeof (switches) / sizeof (switches[0]) * 3];
static struct option long_options[(sizeof (switches) / sizeof (switches[0])) +
				  (sizeof (long_option_aliases) /
				   sizeof (long_option_aliases[0]))];

/* Fill in the string and vector for getopt.  */
static void
init_switches (void)
{
  char *p;
  unsigned int c;
  unsigned int i;

  if (options[0] != '\0')
    /* Already done.  */
    return;

  p = options;

  /* Return switch and non-switch args in order, regardless of
     POSIXLY_CORRECT.  Non-switch args are returned as option 1.  */
  *p++ = '-';

  for (i = 0; switches[i].c != '\0'; ++i)
    {
      long_options[i].name = (switches[i].long_name == 0 ? "" :
			      switches[i].long_name);
      long_options[i].flag = 0;
      long_options[i].val = switches[i].c;
      if (short_option (switches[i].c))
	*p++ = switches[i].c;
      switch (switches[i].type)
	{
	case flag:
	case flag_off:
	case ignore:
	  long_options[i].has_arg = no_argument;
	  break;

	case string:
        case filename:
	case positive_int:
	case floating:
	  if (short_option (switches[i].c))
	    *p++ = ':';
	  if (switches[i].noarg_value != 0)
	    {
	      if (short_option (switches[i].c))
		*p++ = ':';
	      long_options[i].has_arg = optional_argument;
	    }
	  else
	    long_options[i].has_arg = required_argument;
	  break;
	}
    }
  *p = '\0';
  for (c = 0; c < (sizeof (long_option_aliases) /
		   sizeof (long_option_aliases[0]));
       ++c)
    long_options[i++] = long_option_aliases[c];
  long_options[i].name = 0;
}

static void
handle_non_switch_argument (char *arg, int env)
{
  /* Non-option argument.  It might be a variable definition.  */
  struct variable *v;
  if (arg[0] == '-' && arg[1] == '\0')
    /* Ignore plain `-' for compatibility.  */
    return;
  v = try_variable_definition (0, arg, o_command, 0);
  if (v != 0)
    {
      /* It is indeed a variable definition.  If we don't already have this
	 one, record a pointer to the variable for later use in
	 define_makeflags.  */
      struct command_variable *cv;

      for (cv = command_variables; cv != 0; cv = cv->next)
        if (cv->variable == v)
          break;

      if (! cv) {
        cv = xmalloc (sizeof (*cv));
        cv->variable = v;
        cv->next = command_variables;
        command_variables = cv;
      }
    }
  else if (! env)
    {
      /* Not an option or variable definition; it must be a goal
	 target!  Enter it as a file and add it to the dep chain of
	 goals.  */
      struct file *f = enter_file (strcache_add (expand_command_line_file (arg)));
      f->cmd_target = 1;

      if (goals == 0)
	{
	  goals = alloc_dep ();
	  lastgoal = goals;
	}
      else
	{
	  lastgoal->next = alloc_dep ();
	  lastgoal = lastgoal->next;
	}

      lastgoal->file = f;

      {
        /* Add this target name to the MAKECMDGOALS variable. */
        struct variable *gv;
        const char *value;

        gv = lookup_variable (STRING_SIZE_TUPLE ("MAKECMDGOALS"));
        if (gv == 0)
          value = f->name;
        else
          {
            /* Paste the old and new values together */
            unsigned int oldlen, newlen;
            char *vp;

            oldlen = strlen (gv->value);
            newlen = strlen (f->name);
            vp = alloca (oldlen + 1 + newlen + 1);
            memcpy (vp, gv->value, oldlen);
            vp[oldlen] = ' ';
            memcpy (&vp[oldlen + 1], f->name, newlen + 1);
            value = vp;
          }
        define_variable ("MAKECMDGOALS", 12, value, o_default, 0);
      }
    }
}

/* Print a nice usage method.  */

static void
print_usage (int bad)
{
  const char *const *cpp;
  FILE *usageto;

  if (print_version_flag)
    print_version ();

  usageto = bad ? stderr : stdout;

  fprintf (usageto, _("Usage: %s [options] [target] ...\n"), program);

  for (cpp = usage; *cpp; ++cpp)
    fputs (_(*cpp), usageto);

  if (!remote_description || *remote_description == '\0')
    fprintf (usageto, _("\nThis program built for %s\n"), make_host);
  else
    fprintf (usageto, _("\nThis program built for %s (%s)\n"),
             make_host, remote_description);

  fprintf (usageto, _("Report bugs to <bug-make@gnu.org>\n"));
}

/* Decode switches from ARGC and ARGV.
   They came from the environment if ENV is nonzero.  */

static void
decode_switches (int argc, char **argv, int env)
{
  int bad = 0;
  register const struct command_switch *cs;
  register struct stringlist *sl;
  register int c;

  /* getopt does most of the parsing for us.
     First, get its vectors set up.  */

  init_switches ();

  /* Let getopt produce error messages for the command line,
     but not for options from the environment.  */
  opterr = !env;
  /* Reset getopt's state.  */
  optind = 0;

  while (optind < argc)
    {
      /* Parse the next argument.  */
      c = getopt_long (argc, argv, options, long_options, (int *) 0);
      if (c == EOF)
	/* End of arguments, or "--" marker seen.  */
	break;
      else if (c == 1)
	/* An argument not starting with a dash.  */
	handle_non_switch_argument (optarg, env);
      else if (c == '?')
	/* Bad option.  We will print a usage message and die later.
	   But continue to parse the other options so the user can
	   see all he did wrong.  */
	bad = 1;
      else
	for (cs = switches; cs->c != '\0'; ++cs)
	  if (cs->c == c)
	    {
	      /* Whether or not we will actually do anything with
		 this switch.  We test this individually inside the
		 switch below rather than just once outside it, so that
		 options which are to be ignored still consume args.  */
	      int doit = !env || cs->env;

	      switch (cs->type)
		{
		default:
		  abort ();

		case ignore:
		  break;

		case flag:
		case flag_off:
		  if (doit)
		    *(int *) cs->value_ptr = cs->type == flag;
		  break;

		case string:
		case filename:
		  if (!doit)
		    break;

		  if (optarg == 0)
		    optarg = xstrdup (cs->noarg_value);
                  else if (*optarg == '\0')
                    {
                      error (NILF, _("the `-%c' option requires a non-empty string argument"),
                             cs->c);
                      bad = 1;
                    }

		  sl = *(struct stringlist **) cs->value_ptr;
		  if (sl == 0)
		    {
		      sl = (struct stringlist *)
			xmalloc (sizeof (struct stringlist));
		      sl->max = 5;
		      sl->idx = 0;
		      sl->list = xmalloc (5 * sizeof (char *));
		      *(struct stringlist **) cs->value_ptr = sl;
		    }
		  else if (sl->idx == sl->max - 1)
		    {
		      sl->max += 5;
		      sl->list = xrealloc (sl->list,
                                           sl->max * sizeof (char *));
		    }
                  if (cs->type == filename)
                    sl->list[sl->idx++] = expand_command_line_file (optarg);
                  else
                    sl->list[sl->idx++] = optarg;
		  sl->list[sl->idx] = 0;
		  break;

		case positive_int:
                  /* See if we have an option argument; if we do require that
                     it's all digits, not something like "10foo".  */
		  if (optarg == 0 && argc > optind)
                    {
                      const char *cp;
                      for (cp=argv[optind]; ISDIGIT (cp[0]); ++cp)
                        ;
                      if (cp[0] == '\0')
                        optarg = argv[optind++];
                    }

		  if (!doit)
		    break;

		  if (optarg != 0)
		    {
		      int i = atoi (optarg);
                      const char *cp;

                      /* Yes, I realize we're repeating this in some cases.  */
                      for (cp = optarg; ISDIGIT (cp[0]); ++cp)
                        ;

		      if (i < 1 || cp[0] != '\0')
			{
                          error (NILF, _("the `-%c' option requires a positive integral argument"),
                                 cs->c);
			  bad = 1;
			}
		      else
			*(unsigned int *) cs->value_ptr = i;
		    }
		  else
		    *(unsigned int *) cs->value_ptr
		      = *(unsigned int *) cs->noarg_value;
		  break;

#ifndef NO_FLOAT
		case floating:
		  if (optarg == 0 && optind < argc
		      && (ISDIGIT (argv[optind][0]) || argv[optind][0] == '.'))
		    optarg = argv[optind++];

		  if (doit)
		    *(double *) cs->value_ptr
		      = (optarg != 0 ? atof (optarg)
			 : *(double *) cs->noarg_value);

		  break;
#endif
		}

	      /* We've found the switch.  Stop looking.  */
	      break;
	    }
    }

  /* There are no more options according to getting getopt, but there may
     be some arguments left.  Since we have asked for non-option arguments
     to be returned in order, this only happens when there is a "--"
     argument to prevent later arguments from being options.  */
  while (optind < argc)
    handle_non_switch_argument (argv[optind++], env);


  if (!env && (bad || print_usage_flag))
    {
      print_usage (bad);
      die (bad ? 2 : 0);
    }
}

/* Decode switches from environment variable ENVAR (which is LEN chars long).
   We do this by chopping the value into a vector of words, prepending a
   dash to the first word if it lacks one, and passing the vector to
   decode_switches.  */

static void
decode_env_switches (char *envar, unsigned int len)
{
  char *varref = alloca (2 + len + 2);
  char *value, *p;
  int argc;
  char **argv;

  /* Get the variable's value.  */
  varref[0] = '$';
  varref[1] = '(';
  memcpy (&varref[2], envar, len);
  varref[2 + len] = ')';
  varref[2 + len + 1] = '\0';
  value = variable_expand (varref);

  /* Skip whitespace, and check for an empty value.  */
  value = next_token (value);
  len = strlen (value);
  if (len == 0)
    return;

  /* Allocate a vector that is definitely big enough.  */
  argv = alloca ((1 + len + 1) * sizeof (char *));

  /* Allocate a buffer to copy the value into while we split it into words
     and unquote it.  We must use permanent storage for this because
     decode_switches may store pointers into the passed argument words.  */
  p = xmalloc (2 * len);

  /* getopt will look at the arguments starting at ARGV[1].
     Prepend a spacer word.  */
  argv[0] = 0;
  argc = 1;
  argv[argc] = p;
  while (*value != '\0')
    {
      if (*value == '\\' && value[1] != '\0')
	++value;		/* Skip the backslash.  */
      else if (isblank ((unsigned char)*value))
	{
	  /* End of the word.  */
	  *p++ = '\0';
	  argv[++argc] = p;
	  do
	    ++value;
	  while (isblank ((unsigned char)*value));
	  continue;
	}
      *p++ = *value++;
    }
  *p = '\0';
  argv[++argc] = 0;

  if (argv[1][0] != '-' && strchr (argv[1], '=') == 0)
    /* The first word doesn't start with a dash and isn't a variable
       definition.  Add a dash and pass it along to decode_switches.  We
       need permanent storage for this in case decode_switches saves
       pointers into the value.  */
    argv[1] = xstrdup (concat (2, "-", argv[1]));

  /* Parse those words.  */
  decode_switches (argc, argv, 1);
}

/* Quote the string IN so that it will be interpreted as a single word with
   no magic by decode_env_switches; also double dollar signs to avoid
   variable expansion in make itself.  Write the result into OUT, returning
   the address of the next character to be written.
   Allocating space for OUT twice the length of IN is always sufficient.  */

static char *
quote_for_env (char *out, const char *in)
{
  while (*in != '\0')
    {
      if (*in == '$')
	*out++ = '$';
      else if (isblank ((unsigned char)*in) || *in == '\\')
        *out++ = '\\';
      *out++ = *in++;
    }

  return out;
}

/* Define the MAKEFLAGS and MFLAGS variables to reflect the settings of the
   command switches.  Include options with args if ALL is nonzero.
   Don't include options with the `no_makefile' flag set if MAKEFILE.  */

static const char *
define_makeflags (int all, int makefile)
{
  static const char ref[] = "$(MAKEOVERRIDES)";
  static const char posixref[] = "$(-*-command-variables-*-)";
  register const struct command_switch *cs;
  char *flagstring;
  register char *p;
  unsigned int words;
  struct variable *v;

  /* We will construct a linked list of `struct flag's describing
     all the flags which need to go in MAKEFLAGS.  Then, once we
     know how many there are and their lengths, we can put them all
     together in a string.  */

  struct flag
    {
      struct flag *next;
      const struct command_switch *cs;
      const char *arg;
    };
  struct flag *flags = 0;
  unsigned int flagslen = 0;
#define	ADD_FLAG(ARG, LEN) \
  do {									      \
    struct flag *new = alloca (sizeof (struct flag));                         \
    new->cs = cs;							      \
    new->arg = (ARG);							      \
    new->next = flags;							      \
    flags = new;							      \
    if (new->arg == 0)							      \
      ++flagslen;		/* Just a single flag letter.  */	      \
    else								      \
      flagslen += 1 + 1 + 1 + 1 + 3 * (LEN); /* " -x foo" */		      \
    if (!short_option (cs->c))						      \
      /* This switch has no single-letter version, so we use the long.  */    \
      flagslen += 2 + strlen (cs->long_name);				      \
  } while (0)

  for (cs = switches; cs->c != '\0'; ++cs)
    if (cs->toenv && (!makefile || !cs->no_makefile))
      switch (cs->type)
	{
	case ignore:
	  break;

	case flag:
	case flag_off:
	  if (!*(int *) cs->value_ptr == (cs->type == flag_off)
	      && (cs->default_value == 0
		  || *(int *) cs->value_ptr != *(int *) cs->default_value))
	    ADD_FLAG (0, 0);
	  break;

	case positive_int:
	  if (all)
	    {
	      if ((cs->default_value != 0
		   && (*(unsigned int *) cs->value_ptr
		       == *(unsigned int *) cs->default_value)))
		break;
	      else if (cs->noarg_value != 0
		       && (*(unsigned int *) cs->value_ptr ==
			   *(unsigned int *) cs->noarg_value))
		ADD_FLAG ("", 0); /* Optional value omitted; see below.  */
	      else if (cs->c == 'j')
		/* Special case for `-j'.  */
		ADD_FLAG ("1", 1);
	      else
		{
		  char *buf = alloca (30);
		  sprintf (buf, "%u", *(unsigned int *) cs->value_ptr);
		  ADD_FLAG (buf, strlen (buf));
		}
	    }
	  break;

#ifndef NO_FLOAT
	case floating:
	  if (all)
	    {
	      if (cs->default_value != 0
		  && (*(double *) cs->value_ptr
		      == *(double *) cs->default_value))
		break;
	      else if (cs->noarg_value != 0
		       && (*(double *) cs->value_ptr
			   == *(double *) cs->noarg_value))
		ADD_FLAG ("", 0); /* Optional value omitted; see below.  */
	      else
		{
		  char *buf = alloca (100);
		  sprintf (buf, "%g", *(double *) cs->value_ptr);
		  ADD_FLAG (buf, strlen (buf));
		}
	    }
	  break;
#endif

	case filename:
	case string:
	  if (all)
	    {
	      struct stringlist *sl = *(struct stringlist **) cs->value_ptr;
	      if (sl != 0)
		{
		  /* Add the elements in reverse order, because all the flags
		     get reversed below; and the order matters for some
		     switches (like -I).  */
		  unsigned int i = sl->idx;
		  while (i-- > 0)
		    ADD_FLAG (sl->list[i], strlen (sl->list[i]));
		}
	    }
	  break;

	default:
	  abort ();
	}

  flagslen += 4 + sizeof posixref; /* Four more for the possible " -- ".  */

#undef	ADD_FLAG

  /* Construct the value in FLAGSTRING.
     We allocate enough space for a preceding dash and trailing null.  */
  flagstring = alloca (1 + flagslen + 1);
  memset (flagstring, '\0', 1 + flagslen + 1);
  p = flagstring;
  words = 1;
  *p++ = '-';
  while (flags != 0)
    {
      /* Add the flag letter or name to the string.  */
      if (short_option (flags->cs->c))
	*p++ = flags->cs->c;
      else
	{
          if (*p != '-')
            {
              *p++ = ' ';
              *p++ = '-';
            }
	  *p++ = '-';
	  strcpy (p, flags->cs->long_name);
	  p += strlen (p);
	}
      if (flags->arg != 0)
	{
	  /* A flag that takes an optional argument which in this case is
	     omitted is specified by ARG being "".  We must distinguish
	     because a following flag appended without an intervening " -"
	     is considered the arg for the first.  */
	  if (flags->arg[0] != '\0')
	    {
	      /* Add its argument too.  */
	      *p++ = !short_option (flags->cs->c) ? '=' : ' ';
	      p = quote_for_env (p, flags->arg);
	    }
	  ++words;
	  /* Write a following space and dash, for the next flag.  */
	  *p++ = ' ';
	  *p++ = '-';
	}
      else if (!short_option (flags->cs->c))
	{
	  ++words;
	  /* Long options must each go in their own word,
	     so we write the following space and dash.  */
	  *p++ = ' ';
	  *p++ = '-';
	}
      flags = flags->next;
    }

  /* Define MFLAGS before appending variable definitions.  */

  if (p == &flagstring[1])
    /* No flags.  */
    flagstring[0] = '\0';
  else if (p[-1] == '-')
    {
      /* Kill the final space and dash.  */
      p -= 2;
      *p = '\0';
    }
  else
    /* Terminate the string.  */
    *p = '\0';

  /* Since MFLAGS is not parsed for flags, there is no reason to
     override any makefile redefinition.  */
  (void) define_variable ("MFLAGS", 6, flagstring, o_env, 1);

  if (all && command_variables != 0)
    {
      /* Now write a reference to $(MAKEOVERRIDES), which contains all the
	 command-line variable definitions.  */

      if (p == &flagstring[1])
	/* No flags written, so elide the leading dash already written.  */
	p = flagstring;
      else
	{
	  /* Separate the variables from the switches with a "--" arg.  */
	  if (p[-1] != '-')
	    {
	      /* We did not already write a trailing " -".  */
	      *p++ = ' ';
	      *p++ = '-';
	    }
	  /* There is a trailing " -"; fill it out to " -- ".  */
	  *p++ = '-';
	  *p++ = ' ';
	}

      /* Copy in the string.  */
      if (posix_pedantic)
	{
	  memcpy (p, posixref, sizeof posixref - 1);
	  p += sizeof posixref - 1;
	}
      else
	{
	  memcpy (p, ref, sizeof ref - 1);
	  p += sizeof ref - 1;
	}
    }
  else if (p == &flagstring[1])
    {
      words = 0;
      --p;
    }
  else if (p[-1] == '-')
    /* Kill the final space and dash.  */
    p -= 2;
  /* Terminate the string.  */
  *p = '\0';

  /* If there are switches, omit the leading dash unless it is a single long
     option with two leading dashes.  */
  if (flagstring[0] == '-' && flagstring[1] != '-')
    ++flagstring;

  v = define_variable ("MAKEFLAGS", 9, flagstring,
		       /* This used to use o_env, but that lost when a
			  makefile defined MAKEFLAGS.  Makefiles set
			  MAKEFLAGS to add switches, but we still want
			  to redefine its value with the full set of
			  switches.  Of course, an override or command
			  definition will still take precedence.  */
		       o_file, 1);

  if (! all)
    /* The first time we are called, set MAKEFLAGS to always be exported.
       We should not do this again on the second call, because that is
       after reading makefiles which might have done `unexport MAKEFLAGS'. */
    v->export = v_export;

  return v->value;
}

/* Print version information.  */

static void
print_version (void)
{
  static int printed_version = 0;

  char *precede = print_data_base_flag ? "# " : "";

  if (printed_version)
    /* Do it only once.  */
    return;

  printf ("%sGNU Make %s\n", precede, version_string);

  if (!remote_description || *remote_description == '\0')
    printf (_("%sBuilt for %s\n"), precede, make_host);
  else
    printf (_("%sBuilt for %s (%s)\n"),
            precede, make_host, remote_description);

  /* Print this untranslated.  The coding standards recommend translating the
     (C) to the copyright symbol, but this string is going to change every
     year, and none of the rest of it should be translated (including the
     word "Copyright", so it hardly seems worth it.  */

  printf ("%sCopyright (C) 2009  Free Software Foundation, Inc.\n", precede);

  printf (_("%sLicense GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n\
%sThis is free software: you are free to change and redistribute it.\n\
%sThere is NO WARRANTY, to the extent permitted by law.\n"),
            precede, precede, precede);

  printed_version = 1;

  /* Flush stdout so the user doesn't have to wait to see the
     version information while things are thought about.  */
  fflush (stdout);
}

/* Print a bunch of information about this and that.  */

static void
print_data_base ()
{
  time_t when;

  when = time ((time_t *) 0);
  printf (_("\n# Make data base, printed on %s"), ctime (&when));

  print_variable_data_base ();
  print_dir_data_base ();
  print_rule_data_base ();
  print_file_data_base ();
  print_vpath_data_base ();
  strcache_print_stats ("#");

  when = time ((time_t *) 0);
  printf (_("\n# Finished Make data base on %s\n"), ctime (&when));
}

static void
clean_jobserver (int status)
{
  char token = '+';

  /* Sanity: have we written all our jobserver tokens back?  If our
     exit status is 2 that means some kind of syntax error; we might not
     have written all our tokens so do that now.  If tokens are left
     after any other error code, that's bad.  */

  if (job_fds[0] != -1 && jobserver_tokens)
    {
      if (status != 2)
        error (NILF,
               "INTERNAL: Exiting with %u jobserver tokens (should be 0)!",
               jobserver_tokens);
      else
        while (jobserver_tokens--)
          {
            int r;

            EINTRLOOP (r, write (job_fds[1], &token, 1));
            if (r != 1)
              perror_with_name ("write", "");
          }
    }


  /* Sanity: If we're the master, were all the tokens written back?  */

  if (master_job_slots)
    {
      /* We didn't write one for ourself, so start at 1.  */
      unsigned int tcnt = 1;

      /* Close the write side, so the read() won't hang.  */
      close (job_fds[1]);

      while (read (job_fds[0], &token, 1) == 1)
        ++tcnt;

      if (tcnt != master_job_slots)
        error (NILF,
               "INTERNAL: Exiting with %u jobserver tokens available; should be %u!",
               tcnt, master_job_slots);

      close (job_fds[0]);

      /* Clean out jobserver_fds so we don't pass this information to any
         sub-makes.  Also reset job_slots since it will be put on the command
         line, not in MAKEFLAGS.  */
      job_slots = default_job_slots;
      if (jobserver_fds)
        {
          free (jobserver_fds->list);
          free (jobserver_fds);
          jobserver_fds = 0;
        }
    }
}

/* Exit with STATUS, cleaning up as necessary.  */

void
die (int status)
{
  static char dying = 0;

  if (!dying)
    {
      int err;

      dying = 1;

      if (print_version_flag)
	print_version ();

      /* Wait for children to die.  */
      err = (status != 0);
      while (job_slots_used > 0)
	reap_children (1, err);

      /* Let the remote job module clean up its state.  */
      remote_cleanup ();

      /* Remove the intermediate files.  */
      remove_intermediates (0);

      if (print_data_base_flag)
	print_data_base ();

      verify_file_data_base ();

      clean_jobserver (status);

      /* Try to move back to the original directory.  This is essential on
	 MS-DOS (where there is really only one process), and on Unix it
	 puts core files in the original directory instead of the -C
	 directory.  Must wait until after remove_intermediates(), or unlinks
         of relative pathnames fail.  */
      if (directory_before_chdir != 0)
	chdir (directory_before_chdir);

      log_working_directory (0);
    }

  exit (status);
}

/* Write a message indicating that we've just entered or
   left (according to ENTERING) the current directory.  */

void
log_working_directory (int entering)
{
  static int entered = 0;

  /* Print nothing without the flag.  Don't print the entering message
     again if we already have.  Don't print the leaving message if we
     haven't printed the entering message.  */
  if (! print_directory_flag || entering == entered)
    return;

  entered = entering;

  if (print_data_base_flag)
    fputs ("# ", stdout);

  /* Use entire sentences to give the translators a fighting chance.  */

  if (makelevel == 0)
    if (starting_directory == 0)
      if (entering)
        printf (_("%s: Entering an unknown directory\n"), program);
      else
        printf (_("%s: Leaving an unknown directory\n"), program);
    else
      if (entering)
        printf (_("%s: Entering directory `%s'\n"),
                program, starting_directory);
      else
        printf (_("%s: Leaving directory `%s'\n"),
                program, starting_directory);
  else
    if (starting_directory == 0)
      if (entering)
        printf (_("%s[%u]: Entering an unknown directory\n"),
                program, makelevel);
      else
        printf (_("%s[%u]: Leaving an unknown directory\n"),
                program, makelevel);
    else
      if (entering)
        printf (_("%s[%u]: Entering directory `%s'\n"),
                program, makelevel, starting_directory);
      else
        printf (_("%s[%u]: Leaving directory `%s'\n"),
                program, makelevel, starting_directory);

  /* Flush stdout to be sure this comes before any stderr output.  */
  fflush (stdout);
}