(scm_gc_malloc): Return NULL if requested size is 0.

(scm_gc_free): Don't call `free' if mem is NULL.

NEWS

@@ -52,6 +52,8 @@ called with an associator proc that returns neither a pair nor #f.
 ** Avoid MacOS build problems caused by incorrect combination of "64"
 system and library calls.
 ** Fixed compilation of `numbers.c' with Sun Studio (Solaris 9)
+** Fixed wrong-type-arg errors when creating zero length SRFI-4
+uniform vectors on AIX.
 
 * New modules (see the manual for details)
 

THANKS

@@ -80,6 +80,7 @@ For fixes or providing information which led to a fix:
            Alex Shinn
          Daniel Skarda
           Cesar Strauss
+         Rainer Tammer
         Richard Todd
           Issac Trotts
            Greg Troxel

libguile/ChangeLog

@@ -1,3 +1,8 @@
+2008-02-06  Neil Jerram  <neil@ossau.uklinux.net>
+
+	* gc-malloc.c (scm_gc_malloc): Return NULL if requested size is 0.
+	(scm_gc_free): Don't call `free' if mem is NULL.
+
 2008-02-06  Ludovic Courtès  <ludo@gnu.org>
 
 	* numbers.c (scm_i_mkbig, scm_i_long2big, scm_i_ulong2big,

libguile/gc-malloc.c

@@ -319,7 +319,7 @@ scm_gc_malloc (size_t size, const char *what)
      to write it the program is killed with signal 11. --hwn
   */
 
-  void *ptr = scm_malloc (size);
+  void *ptr = size ? scm_malloc (size) : NULL;
   scm_gc_register_collectable_memory (ptr, size, what);
   return ptr;
 }
@@ -365,7 +365,8 @@ void
 scm_gc_free (void *mem, size_t size, const char *what)
 {
   scm_gc_unregister_collectable_memory (mem, size, what);
-  free (mem);
+  if (mem)
+    free (mem);
 }
 
 char *