/* Internals of variables for GNU Make. Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 2002 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 2, 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 GNU Make; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "make.h" #include "dep.h" #include "filedef.h" #include "job.h" #include "commands.h" #include "variable.h" #include "rule.h" #ifdef WINDOWS32 #include "pathstuff.h" #endif #include "hash.h" /* Chain of all pattern-specific variables. */ static struct pattern_var *pattern_vars; /* Pointer to last struct in the chain, so we can add onto the end. */ static struct pattern_var *last_pattern_var; /* Create a new pattern-specific variable struct. */ struct pattern_var * create_pattern_var (char *target, char *suffix) { register struct pattern_var *p = (struct pattern_var *) xmalloc (sizeof (struct pattern_var)); if (last_pattern_var != 0) last_pattern_var->next = p; else pattern_vars = p; last_pattern_var = p; p->next = 0; p->target = target; p->len = strlen (target); p->suffix = suffix + 1; return p; } /* Look up a target in the pattern-specific variable list. */ static struct pattern_var * lookup_pattern_var (struct pattern_var *start, char *target) { struct pattern_var *p; unsigned int targlen = strlen(target); for (p = start ? start->next : pattern_vars; p != 0; p = p->next) { char *stem; unsigned int stemlen; if (p->len > targlen) /* It can't possibly match. */ continue; /* From the lengths of the filename and the pattern parts, find the stem: the part of the filename that matches the %. */ stem = target + (p->suffix - p->target - 1); stemlen = targlen - p->len + 1; /* Compare the text in the pattern before the stem, if any. */ if (stem > target && !strneq (p->target, target, stem - target)) continue; /* Compare the text in the pattern after the stem, if any. We could test simply using streq, but this way we compare the first two characters immediately. This saves time in the very common case where the first character matches because it is a period. */ if (*p->suffix == stem[stemlen] && (*p->suffix == '\0' || streq (&p->suffix[1], &stem[stemlen+1]))) break; } return p; } /* Hash table of all global variable definitions. */ static unsigned long variable_hash_1 (const void *keyv) { struct variable const *key = (struct variable const *) keyv; return_STRING_N_HASH_1 (key->name, key->length); } static unsigned long variable_hash_2 (const void *keyv) { struct variable const *key = (struct variable const *) keyv; return_STRING_N_HASH_2 (key->name, key->length); } static int variable_hash_cmp (const void *xv, const void *yv) { struct variable const *x = (struct variable const *) xv; struct variable const *y = (struct variable const *) yv; int result = x->length - y->length; if (result) return result; return_STRING_N_COMPARE (x->name, y->name, x->length); } #ifndef VARIABLE_BUCKETS #define VARIABLE_BUCKETS 523 #endif #ifndef PERFILE_VARIABLE_BUCKETS #define PERFILE_VARIABLE_BUCKETS 23 #endif #ifndef SMALL_SCOPE_VARIABLE_BUCKETS #define SMALL_SCOPE_VARIABLE_BUCKETS 13 #endif static struct variable_set global_variable_set; static struct variable_set_list global_setlist = { 0, &global_variable_set }; struct variable_set_list *current_variable_set_list = &global_setlist; /* Implement variables. */ void init_hash_global_variable_set (void) { hash_init (&global_variable_set.table, VARIABLE_BUCKETS, variable_hash_1, variable_hash_2, variable_hash_cmp); } /* Define variable named NAME with value VALUE in SET. VALUE is copied. LENGTH is the length of NAME, which does not need to be null-terminated. ORIGIN specifies the origin of the variable (makefile, command line or environment). If RECURSIVE is nonzero a flag is set in the variable saying that it should be recursively re-expanded. */ struct variable * define_variable_in_set (const char *name, unsigned int length, char *value, enum variable_origin origin, int recursive, struct variable_set *set, const struct floc *flocp) { struct variable *v; struct variable **var_slot; struct variable var_key; if (set == NULL) set = &global_variable_set; var_key.name = (char *) name; var_key.length = length; var_slot = (struct variable **) hash_find_slot (&set->table, &var_key); if (env_overrides && origin == o_env) origin = o_env_override; v = *var_slot; if (! HASH_VACANT (v)) { if (env_overrides && v->origin == o_env) /* V came from in the environment. Since it was defined before the switches were parsed, it wasn't affected by -e. */ v->origin = o_env_override; /* A variable of this name is already defined. If the old definition is from a stronger source than this one, don't redefine it. */ if ((int) origin >= (int) v->origin) { if (v->value != 0) free (v->value); v->value = xstrdup (value); if (flocp != 0) v->fileinfo = *flocp; else v->fileinfo.filenm = 0; v->origin = origin; v->recursive = recursive; } return v; } /* Create a new variable definition and add it to the hash table. */ v = (struct variable *) xmalloc (sizeof (struct variable)); v->name = savestring (name, length); v->length = length; hash_insert_at (&set->table, v, var_slot); v->value = xstrdup (value); if (flocp != 0) v->fileinfo = *flocp; else v->fileinfo.filenm = 0; v->origin = origin; v->recursive = recursive; v->special = 0; v->expanding = 0; v->exp_count = 0; v->per_target = 0; v->append = 0; v->export = v_default; v->exportable = 1; if (*name != '_' && (*name < 'A' || *name > 'Z') && (*name < 'a' || *name > 'z')) v->exportable = 0; else { for (++name; *name != '\0'; ++name) if (*name != '_' && (*name < 'a' || *name > 'z') && (*name < 'A' || *name > 'Z') && !ISDIGIT(*name)) break; if (*name != '\0') v->exportable = 0; } return v; } /* If the variable passed in is "special", handle its special nature. Currently there are two such variables, both used for introspection: .VARIABLES expands to a list of all the variables defined in this instance of make. .TARGETS expands to a list of all the targets defined in this instance of make. Returns the variable reference passed in. */ #define EXPANSION_INCREMENT(_l) ((((_l) / 500) + 1) * 500) static struct variable * handle_special_var (struct variable *var) { static unsigned long last_var_count = 0; /* This one actually turns out to be very hard, due to the way the parser records targets. The way it works is that target information is collected internally until make knows the target is completely specified. It unitl it sees that some new construct (a new target or variable) is defined that it knows the previous one is done. In short, this means that if you do this: all: TARGS := $(.TARGETS) then $(TARGS) won't contain "all", because it's not until after the variable is created that the previous target is completed. Changing this would be a major pain. I think a less complex way to do it would be to pre-define the target files as soon as the first line is parsed, then come back and do the rest of the definition as now. That would allow $(.TARGETS) to be correct without a major change to the way the parser works. if (streq (var->name, ".TARGETS")) var->value = build_target_list (var->value); else */ if (streq (var->name, ".VARIABLES") && global_variable_set.table.ht_fill != last_var_count) { unsigned long max = EXPANSION_INCREMENT (strlen (var->value)); unsigned long len; char *p; struct variable **vp = (struct variable **) global_variable_set.table.ht_vec; struct variable **end = &vp[global_variable_set.table.ht_size]; /* Make sure we have at least MAX bytes in the allocated buffer. */ var->value = xrealloc (var->value, max); /* Walk through the hash of variables, constructing a list of names. */ p = var->value; len = 0; for (; vp < end; ++vp) if (!HASH_VACANT (*vp)) { struct variable *v = *vp; int l = v->length; len += l + 1; if (len > max) { unsigned long off = p - var->value; max += EXPANSION_INCREMENT (l + 1); var->value = xrealloc (var->value, max); p = &var->value[off]; } bcopy (v->name, p, l); p += l; *(p++) = ' '; } *(p-1) = '\0'; /* Remember how many variables are in our current count. Since we never remove variables from the list, this is a reliable way to know whether the list is up to date or needs to be recomputed. */ last_var_count = global_variable_set.table.ht_fill; } return var; } /* Lookup a variable whose name is a string starting at NAME and with LENGTH chars. NAME need not be null-terminated. Returns address of the `struct variable' containing all info on the variable, or nil if no such variable is defined. */ struct variable * lookup_variable (const char *name, unsigned int length) { const struct variable_set_list *setlist; struct variable var_key; var_key.name = (char *) name; var_key.length = length; for (setlist = current_variable_set_list; setlist != 0; setlist = setlist->next) { const struct variable_set *set = setlist->set; struct variable *v; v = (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key); if (v) return v->special ? handle_special_var (v) : v; } #ifdef VMS /* since we don't read envp[] on startup, try to get the variable via getenv() here. */ { char *vname = alloca (length + 1); char *value; strncpy (vname, name, length); vname[length] = 0; value = getenv (vname); if (value != 0) { char *sptr; int scnt; sptr = value; scnt = 0; while ((sptr = strchr (sptr, '$'))) { scnt++; sptr++; } if (scnt > 0) { char *nvalue; char *nptr; nvalue = alloca (strlen (value) + scnt + 1); sptr = value; nptr = nvalue; while (*sptr) { if (*sptr == '$') { *nptr++ = '$'; *nptr++ = '$'; } else { *nptr++ = *sptr; } sptr++; } *nptr = '\0'; return define_variable (vname, length, nvalue, o_env, 1); } return define_variable (vname, length, value, o_env, 1); } } #endif /* VMS */ return 0; } /* Lookup a variable whose name is a string starting at NAME and with LENGTH chars in set SET. NAME need not be null-terminated. Returns address of the `struct variable' containing all info on the variable, or nil if no such variable is defined. */ struct variable * lookup_variable_in_set (const char *name, unsigned int length, const struct variable_set *set) { struct variable var_key; var_key.name = (char *) name; var_key.length = length; return (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key); } /* Initialize FILE's variable set list. If FILE already has a variable set list, the topmost variable set is left intact, but the the rest of the chain is replaced with FILE->parent's setlist. If FILE is a double-colon rule, then we will use the "root" double-colon target's variable set as the parent of FILE's variable set. If we're READing a makefile, don't do the pattern variable search now, since the pattern variable might not have been defined yet. */ void initialize_file_variables (struct file *file, int reading) { register struct variable_set_list *l = file->variables; if (l == 0) { l = (struct variable_set_list *) xmalloc (sizeof (struct variable_set_list)); l->set = (struct variable_set *) xmalloc (sizeof (struct variable_set)); hash_init (&l->set->table, PERFILE_VARIABLE_BUCKETS, variable_hash_1, variable_hash_2, variable_hash_cmp); file->variables = l; } /* If this is a double-colon, then our "parent" is the "root" target for this double-colon rule. Since that rule has the same name, parent, etc. we can just use its variables as the "next" for ours. */ if (file->double_colon && file->double_colon != file) { initialize_file_variables (file->double_colon, reading); l->next = file->double_colon->variables; return; } if (file->parent == 0) l->next = &global_setlist; else { initialize_file_variables (file->parent, reading); l->next = file->parent->variables; } /* If we're not reading makefiles and we haven't looked yet, see if we can find pattern variables for this target. */ if (!reading && !file->pat_searched) { struct pattern_var *p; p = lookup_pattern_var (0, file->name); if (p != 0) { struct variable_set_list *global = current_variable_set_list; /* We found at least one. Set up a new variable set to accumulate all the pattern variables that match this target. */ file->pat_variables = create_new_variable_set (); current_variable_set_list = file->pat_variables; do { /* We found one, so insert it into the set. */ struct variable *v = do_variable_definition ( &p->variable.fileinfo, p->variable.name, p->variable.value, p->variable.origin, p->variable.flavor, 1); /* Also mark it as a per-target and copy export status. */ v->per_target = p->variable.per_target; v->export = p->variable.export; } while ((p = lookup_pattern_var (p, file->name)) != 0); current_variable_set_list = global; } file->pat_searched = 1; } /* If we have a pattern variable match, set it up. */ if (file->pat_variables != 0) { file->pat_variables->next = l->next; l->next = file->pat_variables; } } /* Pop the top set off the current variable set list, and free all its storage. */ static void free_variable_name_and_value (const void *item) { struct variable *v = (struct variable *) item; free (v->name); free (v->value); } void pop_variable_scope (void) { struct variable_set_list *setlist = current_variable_set_list; struct variable_set *set = setlist->set; current_variable_set_list = setlist->next; free ((char *) setlist); hash_map (&set->table, free_variable_name_and_value); hash_free (&set->table, 1); free ((char *) set); } struct variable_set_list * create_new_variable_set (void) { register struct variable_set_list *setlist; register struct variable_set *set; set = (struct variable_set *) xmalloc (sizeof (struct variable_set)); hash_init (&set->table, SMALL_SCOPE_VARIABLE_BUCKETS, variable_hash_1, variable_hash_2, variable_hash_cmp); setlist = (struct variable_set_list *) xmalloc (sizeof (struct variable_set_list)); setlist->set = set; setlist->next = current_variable_set_list; return setlist; } /* Create a new variable set and push it on the current setlist. */ struct variable_set_list * push_new_variable_scope (void) { return (current_variable_set_list = create_new_variable_set()); } /* Merge FROM_SET into TO_SET, freeing unused storage in FROM_SET. */ static void merge_variable_sets (struct variable_set *to_set, struct variable_set *from_set) { struct variable **from_var_slot = (struct variable **) from_set->table.ht_vec; struct variable **from_var_end = from_var_slot + from_set->table.ht_size; for ( ; from_var_slot < from_var_end; from_var_slot++) if (! HASH_VACANT (*from_var_slot)) { struct variable *from_var = *from_var_slot; struct variable **to_var_slot = (struct variable **) hash_find_slot (&to_set->table, *from_var_slot); if (HASH_VACANT (*to_var_slot)) hash_insert_at (&to_set->table, from_var, to_var_slot); else { /* GKM FIXME: delete in from_set->table */ free (from_var->value); free (from_var); } } } /* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */ void merge_variable_set_lists (struct variable_set_list **setlist0, struct variable_set_list *setlist1) { register struct variable_set_list *list0 = *setlist0; struct variable_set_list *last0 = 0; while (setlist1 != 0 && list0 != 0) { struct variable_set_list *next = setlist1; setlist1 = setlist1->next; merge_variable_sets (list0->set, next->set); last0 = list0; list0 = list0->next; } if (setlist1 != 0) { if (last0 == 0) *setlist0 = setlist1; else last0->next = setlist1; } } /* Define the automatic variables, and record the addresses of their structures so we can change their values quickly. */ void define_automatic_variables (void) { #if defined(WINDOWS32) || defined(__EMX__) extern char* default_shell; #else extern char default_shell[]; #endif register struct variable *v; char buf[200]; sprintf (buf, "%u", makelevel); (void) define_variable (MAKELEVEL_NAME, MAKELEVEL_LENGTH, buf, o_env, 0); sprintf (buf, "%s%s%s", version_string, (remote_description == 0 || remote_description[0] == '\0') ? "" : "-", (remote_description == 0 || remote_description[0] == '\0') ? "" : remote_description); (void) define_variable ("MAKE_VERSION", 12, buf, o_default, 0); #ifdef __MSDOS__ /* Allow to specify a special shell just for Make, and use $COMSPEC as the default $SHELL when appropriate. */ { static char shell_str[] = "SHELL"; const int shlen = sizeof (shell_str) - 1; struct variable *mshp = lookup_variable ("MAKESHELL", 9); struct variable *comp = lookup_variable ("COMSPEC", 7); /* Make $MAKESHELL override $SHELL even if -e is in effect. */ if (mshp) (void) define_variable (shell_str, shlen, mshp->value, o_env_override, 0); else if (comp) { /* $COMSPEC shouldn't override $SHELL. */ struct variable *shp = lookup_variable (shell_str, shlen); if (!shp) (void) define_variable (shell_str, shlen, comp->value, o_env, 0); } } #elif defined(__EMX__) { static char shell_str[] = "SHELL"; const int shlen = sizeof (shell_str) - 1; struct variable *shell = lookup_variable (shell_str, shlen); struct variable *replace = lookup_variable ("MAKESHELL", 9); /* if $MAKESHELL is defined in the environment assume o_env_override */ if (replace && *replace->value && replace->origin == o_env) replace->origin = o_env_override; /* if $MAKESHELL is not defined use $SHELL but only if the variable did not come from the environment */ if (!replace || !*replace->value) if (shell && *shell->value && (shell->origin == o_env || shell->origin == o_env_override)) { /* overwrite whatever we got from the environment */ free(shell->value); shell->value = xstrdup (default_shell); shell->origin = o_default; } /* Some people do not like cmd to be used as the default if $SHELL is not defined in the Makefile. With -DNO_CMD_DEFAULT you can turn off this behaviour */ # ifndef NO_CMD_DEFAULT /* otherwise use $COMSPEC */ if (!replace || !*replace->value) replace = lookup_variable ("COMSPEC", 7); /* otherwise use $OS2_SHELL */ if (!replace || !*replace->value) replace = lookup_variable ("OS2_SHELL", 9); # else # warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell # endif if (replace && *replace->value) /* overwrite $SHELL */ (void) define_variable (shell_str, shlen, replace->value, replace->origin, 0); else /* provide a definition if there is none */ (void) define_variable (shell_str, shlen, default_shell, o_default, 0); } #endif /* This won't override any definition, but it will provide one if there isn't one there. */ v = define_variable ("SHELL", 5, default_shell, o_default, 0); v->export = v_export; /* Always export SHELL. */ /* On MSDOS we do use SHELL from environment, since it isn't a standard environment variable on MSDOS, so whoever sets it, does that on purpose. On OS/2 we do not use SHELL from environment but we have already handled that problem above. */ #if !defined(__MSDOS__) && !defined(__EMX__) /* Don't let SHELL come from the environment. */ if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override) { free (v->value); v->origin = o_file; v->value = xstrdup (default_shell); } #endif /* Make sure MAKEFILES gets exported if it is set. */ v = define_variable ("MAKEFILES", 9, "", o_default, 0); v->export = v_ifset; /* Define the magic D and F variables in terms of the automatic variables they are variations of. */ #ifdef VMS define_variable ("@D", 2, "$(dir $@)", o_automatic, 1); define_variable ("%D", 2, "$(dir $%)", o_automatic, 1); define_variable ("*D", 2, "$(dir $*)", o_automatic, 1); define_variable ("variables; hash_init (&table, VARIABLE_BUCKETS, variable_hash_1, variable_hash_2, variable_hash_cmp); /* Run through all the variable sets in the list, accumulating variables in TABLE. */ for (s = set_list; s != 0; s = s->next) { struct variable_set *set = s->set; v_slot = (struct variable **) set->table.ht_vec; v_end = v_slot + set->table.ht_size; for ( ; v_slot < v_end; v_slot++) if (! HASH_VACANT (*v_slot)) { struct variable **new_slot; struct variable *v = *v_slot; /* If this is a per-target variable and it hasn't been touched already then look up the global version and take its export value. */ if (v->per_target && v->export == v_default) { struct variable *gv; gv = lookup_variable_in_set (v->name, strlen(v->name), &global_variable_set); if (gv) v->export = gv->export; } switch (v->export) { case v_default: if (v->origin == o_default || v->origin == o_automatic) /* Only export default variables by explicit request. */ continue; /* The variable doesn't have a name that can be exported. */ if (! v->exportable) continue; if (! export_all_variables && v->origin != o_command && v->origin != o_env && v->origin != o_env_override) continue; break; case v_export: break; case v_noexport: continue; case v_ifset: if (v->origin == o_default) continue; break; } new_slot = (struct variable **) hash_find_slot (&table, v); if (HASH_VACANT (*new_slot)) hash_insert_at (&table, v, new_slot); } } makelevel_key.name = MAKELEVEL_NAME; makelevel_key.length = MAKELEVEL_LENGTH; hash_delete (&table, &makelevel_key); result = result_0 = (char **) xmalloc ((table.ht_fill + 2) * sizeof (char *)); v_slot = (struct variable **) table.ht_vec; v_end = v_slot + table.ht_size; for ( ; v_slot < v_end; v_slot++) if (! HASH_VACANT (*v_slot)) { struct variable *v = *v_slot; /* If V is recursively expanded and didn't come from the environment, expand its value. If it came from the environment, it should go back into the environment unchanged. */ if (v->recursive && v->origin != o_env && v->origin != o_env_override) { char *value = recursively_expand_for_file (v, file); #ifdef WINDOWS32 if (strcmp(v->name, "Path") == 0 || strcmp(v->name, "PATH") == 0) convert_Path_to_windows32(value, ';'); #endif *result++ = concat (v->name, "=", value); free (value); } else { #ifdef WINDOWS32 if (strcmp(v->name, "Path") == 0 || strcmp(v->name, "PATH") == 0) convert_Path_to_windows32(v->value, ';'); #endif *result++ = concat (v->name, "=", v->value); } } *result = (char *) xmalloc (100); (void) sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1); *++result = 0; hash_free (&table, 0); return result_0; } /* Given a variable, a value, and a flavor, define the variable. See the try_variable_definition() function for details on the parameters. */ struct variable * do_variable_definition (const struct floc *flocp, const char *varname, char *value, enum variable_origin origin, enum variable_flavor flavor, int target_var) { char *p, *alloc_value = NULL; struct variable *v; int append = 0; int conditional = 0; /* Calculate the variable's new value in VALUE. */ switch (flavor) { default: case f_bogus: /* Should not be possible. */ abort (); case f_simple: /* A simple variable definition "var := value". Expand the value. We have to allocate memory since otherwise it'll clobber the variable buffer, and we may still need that if we're looking at a target-specific variable. */ p = alloc_value = allocated_variable_expand (value); break; case f_conditional: /* A conditional variable definition "var ?= value". The value is set IFF the variable is not defined yet. */ v = lookup_variable (varname, strlen (varname)); if (v) return v; conditional = 1; flavor = f_recursive; /* FALLTHROUGH */ case f_recursive: /* A recursive variable definition "var = value". The value is used verbatim. */ p = value; break; case f_append: { /* If we have += but we're in a target variable context, we want to append only with other variables in the context of this target. */ if (target_var) { append = 1; v = lookup_variable_in_set (varname, strlen (varname), current_variable_set_list->set); /* Don't append from the global set if a previous non-appending target-specific variable definition exists. */ if (v && !v->append) append = 0; } else v = lookup_variable (varname, strlen (varname)); if (v == 0) { /* There was no old value. This becomes a normal recursive definition. */ p = value; flavor = f_recursive; } else { /* Paste the old and new values together in VALUE. */ unsigned int oldlen, vallen; char *val; val = value; if (v->recursive) /* The previous definition of the variable was recursive. The new value is the unexpanded old and new values. */ flavor = f_recursive; else /* The previous definition of the variable was simple. The new value comes from the old value, which was expanded when it was set; and from the expanded new value. Allocate memory for the expansion as we may still need the rest of the buffer if we're looking at a target-specific variable. */ val = alloc_value = allocated_variable_expand (val); oldlen = strlen (v->value); vallen = strlen (val); p = (char *) alloca (oldlen + 1 + vallen + 1); bcopy (v->value, p, oldlen); p[oldlen] = ' '; bcopy (val, &p[oldlen + 1], vallen + 1); } } } #ifdef __MSDOS__ /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but non-Unix systems don't conform to this default configuration (in fact, most of them don't even have `/bin'). On the other hand, $SHELL in the environment, if set, points to the real pathname of the shell. Therefore, we generally won't let lines like "SHELL=/bin/sh" from the Makefile override $SHELL from the environment. But first, we look for the basename of the shell in the directory where SHELL= points, and along the $PATH; if it is found in any of these places, we define $SHELL to be the actual pathname of the shell. Thus, if you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on your $PATH, then SHELL=/usr/local/bin/bash will have the effect of defining SHELL to be "d:/unix/bash.exe". */ if ((origin == o_file || origin == o_override) && strcmp (varname, "SHELL") == 0) { char shellpath[PATH_MAX]; extern char * __dosexec_find_on_path (const char *, char *[], char *); /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */ if (__dosexec_find_on_path (p, (char **)0, shellpath)) { char *p; for (p = shellpath; *p; p++) { if (*p == '\\') *p = '/'; } v = define_variable_loc (varname, strlen (varname), shellpath, origin, flavor == f_recursive, flocp); } else { char *shellbase, *bslash; struct variable *pathv = lookup_variable ("PATH", 4); char *path_string; char *fake_env[2]; size_t pathlen = 0; shellbase = strrchr (p, '/'); bslash = strrchr (p, '\\'); if (!shellbase || bslash > shellbase) shellbase = bslash; if (!shellbase && p[1] == ':') shellbase = p + 1; if (shellbase) shellbase++; else shellbase = p; /* Search for the basename of the shell (with standard executable extensions) along the $PATH. */ if (pathv) pathlen = strlen (pathv->value); path_string = (char *)xmalloc (5 + pathlen + 2 + 1); /* On MSDOS, current directory is considered as part of $PATH. */ sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : ""); fake_env[0] = path_string; fake_env[1] = (char *)0; if (__dosexec_find_on_path (shellbase, fake_env, shellpath)) { char *p; for (p = shellpath; *p; p++) { if (*p == '\\') *p = '/'; } v = define_variable_loc (varname, strlen (varname), shellpath, origin, flavor == f_recursive, flocp); } else v = lookup_variable (varname, strlen (varname)); free (path_string); } } else #endif /* __MSDOS__ */ #ifdef WINDOWS32 if ((origin == o_file || origin == o_override) && streq (varname, "SHELL")) { extern char *default_shell; /* Call shell locator function. If it returns TRUE, then set no_default_sh_exe to indicate sh was found and set new value for SHELL variable. */ if (find_and_set_default_shell (p)) { v = define_variable_in_set (varname, strlen (varname), default_shell, origin, flavor == f_recursive, (target_var ? current_variable_set_list->set : NULL), flocp); no_default_sh_exe = 0; } else v = lookup_variable (varname, strlen (varname)); } else #endif /* If we are defining variables inside an $(eval ...), we might have a different variable context pushed, not the global context (maybe we're inside a $(call ...) or something. Since this function is only ever invoked in places where we want to define globally visible variables, make sure we define this variable in the global set. */ v = define_variable_in_set (varname, strlen (varname), p, origin, flavor == f_recursive, (target_var ? current_variable_set_list->set : NULL), flocp); v->append = append; v->conditional = conditional; if (alloc_value) free (alloc_value); return v; } /* Try to interpret LINE (a null-terminated string) as a variable definition. ORIGIN may be o_file, o_override, o_env, o_env_override, or o_command specifying that the variable definition comes from a makefile, an override directive, the environment with or without the -e switch, or the command line. See the comments for parse_variable_definition(). If LINE was recognized as a variable definition, a pointer to its `struct variable' is returned. If LINE is not a variable definition, NULL is returned. */ struct variable * parse_variable_definition (struct variable *v, char *line) { register int c; register char *p = line; register char *beg; register char *end; enum variable_flavor flavor = f_bogus; char *name; while (1) { c = *p++; if (c == '\0' || c == '#') return 0; if (c == '=') { end = p - 1; flavor = f_recursive; break; } else if (c == ':') if (*p == '=') { end = p++ - 1; flavor = f_simple; break; } else /* A colon other than := is a rule line, not a variable defn. */ return 0; else if (c == '+' && *p == '=') { end = p++ - 1; flavor = f_append; break; } else if (c == '?' && *p == '=') { end = p++ - 1; flavor = f_conditional; break; } else if (c == '$') { /* This might begin a variable expansion reference. Make sure we don't misrecognize chars inside the reference as =, := or +=. */ char closeparen; int count; c = *p++; if (c == '(') closeparen = ')'; else if (c == '{') closeparen = '}'; else continue; /* Nope. */ /* P now points past the opening paren or brace. Count parens or braces until it is matched. */ count = 0; for (; *p != '\0'; ++p) { if (*p == c) ++count; else if (*p == closeparen && --count < 0) { ++p; break; } } } } v->flavor = flavor; beg = next_token (line); while (end > beg && isblank ((unsigned char)end[-1])) --end; p = next_token (p); v->value = p; /* Expand the name, so "$(foo)bar = baz" works. */ name = (char *) alloca (end - beg + 1); bcopy (beg, name, end - beg); name[end - beg] = '\0'; v->name = allocated_variable_expand (name); if (v->name[0] == '\0') fatal (&v->fileinfo, _("empty variable name")); return v; } /* Try to interpret LINE (a null-terminated string) as a variable definition. ORIGIN may be o_file, o_override, o_env, o_env_override, or o_command specifying that the variable definition comes from a makefile, an override directive, the environment with or without the -e switch, or the command line. See the comments for parse_variable_definition(). If LINE was recognized as a variable definition, a pointer to its `struct variable' is returned. If LINE is not a variable definition, NULL is returned. */ struct variable * try_variable_definition (const struct floc *flocp, char *line, enum variable_origin origin, int target_var) { struct variable v; struct variable *vp; if (flocp != 0) v.fileinfo = *flocp; else v.fileinfo.filenm = 0; if (!parse_variable_definition (&v, line)) return 0; vp = do_variable_definition (flocp, v.name, v.value, origin, v.flavor, target_var); free (v.name); return vp; } /* Print information for variable V, prefixing it with PREFIX. */ static void print_variable (const void *item, void *arg) { const struct variable *v = (struct variable *) item; const char *prefix = (char *) arg; const char *origin; switch (v->origin) { case o_default: origin = _("default"); break; case o_env: origin = _("environment"); break; case o_file: origin = _("makefile"); break; case o_env_override: origin = _("environment under -e"); break; case o_command: origin = _("command line"); break; case o_override: origin = _("`override' directive"); break; case o_automatic: origin = _("automatic"); break; case o_invalid: default: abort (); } fputs ("# ", stdout); fputs (origin, stdout); if (v->fileinfo.filenm) printf (_(" (from `%s', line %lu)"), v->fileinfo.filenm, v->fileinfo.lineno); putchar ('\n'); fputs (prefix, stdout); /* Is this a `define'? */ if (v->recursive && strchr (v->value, '\n') != 0) printf ("define %s\n%s\nendef\n", v->name, v->value); else { register char *p; printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":"); /* Check if the value is just whitespace. */ p = next_token (v->value); if (p != v->value && *p == '\0') /* All whitespace. */ printf ("$(subst ,,%s)", v->value); else if (v->recursive) fputs (v->value, stdout); else /* Double up dollar signs. */ for (p = v->value; *p != '\0'; ++p) { if (*p == '$') putchar ('$'); putchar (*p); } putchar ('\n'); } } /* Print all the variables in SET. PREFIX is printed before the actual variable definitions (everything else is comments). */ void print_variable_set (struct variable_set *set, char *prefix) { hash_map_arg (&set->table, print_variable, prefix); fputs (_("# variable set hash-table stats:\n"), stdout); fputs ("# ", stdout); hash_print_stats (&set->table, stdout); putc ('\n', stdout); } /* Print the data base of variables. */ void print_variable_data_base (void) { puts (_("\n# Variables\n")); print_variable_set (&global_variable_set, ""); puts (_("\n# Pattern-specific Variable Values")); { struct pattern_var *p; int rules = 0; for (p = pattern_vars; p != 0; p = p->next) { ++rules; printf ("\n%s :\n", p->target); print_variable (&p->variable, "# "); } if (rules == 0) puts (_("\n# No pattern-specific variable values.")); else printf (_("\n# %u pattern-specific variable values"), rules); } } /* Print all the local variables of FILE. */ void print_file_variables (struct file *file) { if (file->variables != 0) print_variable_set (file->variables->set, "# "); } #ifdef WINDOWS32 void sync_Path_environment (void) { char *path = allocated_variable_expand ("$(Path)"); static char *environ_path = NULL; if (!path) return; /* * If done this before, don't leak memory unnecessarily. * Free the previous entry before allocating new one. */ if (environ_path) free (environ_path); /* * Create something WINDOWS32 world can grok */ convert_Path_to_windows32 (path, ';'); environ_path = concat ("Path", "=", path); putenv (environ_path); free (path); } #endif