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+;; Contents of the (gnu make) Guile module
+;; Copyright (C) 2011 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/>.
+
+(define (to-string-maybe x)
+  (cond
+   ;; In GNU make, "false" is the empty string
+   ((or (not x)
+        (unspecified? x)
+        (null? x)
+        (and (string? x) (string-null? x)))
+    #f)
+   ;; We want something not false... not sure about this
+   ((eq? x #t) "#t")
+   ;; Basics
+   ((or (symbol? x) (number? x))
+    (object->string x))
+   ((char? x)
+    (string x))
+   ;; Printable string (no special characters)
+   ((and (string? x)
+         (eq? (string-length (string-delete x char-set:printing)) 0))
+    x)
+   ;; No idea: fail
+   (else (error "Unknown object:" x))))
+
+(define (obj-to-str x)
+  (let ((acc '()))
+    (define (walk x)
+      (cond ((pair? x) (walk (car x)) (walk (cdr x)))
+            ((to-string-maybe x) => (lambda (s) (set! acc (cons s acc))))))
+    (walk x)
+    (string-join (reverse! acc))))
+
+;; eval (GNU make eval) the input string S
+(define (gmk-eval s)
+  (gmk-expand (format #f "$(eval ~a)" (obj-to-str s))))
+
+;; Return the value of the GNU make variable V
+(define (gmk-var v)
+  (gmk-expand (format #f "$(~a)" (obj-to-str v))))
+
+;; Export the public interfaces
+(export gmk-expand gmk-eval gmk-var)