X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Frealloc.m4;h=aba1984064f0c056523321703624bcd3109e0cdc;hb=727606d389becee323eafca6a8b03ed8219c1982;hp=b4afe939d0e6fc04d3f35b7694bd6314a5650c84;hpb=47a93f77a5ec7f3515a06e91218626f01312c702;p=gnulib.git

diff --git a/m4/realloc.m4 b/m4/realloc.m4
index b4afe939d..aba198406 100644
--- a/m4/realloc.m4
+++ b/m4/realloc.m4
@@ -1,7 +1,7 @@
 #serial 1
 
 dnl From Jim Meyering.
-dnl Determine whether realloc accepts 0 as its first argument.
+dnl Determine whether realloc works when both arguments are 0.
 dnl If it doesn't, arrange to use the replacement function.
 dnl
 dnl If you use this macro in a package, you should
@@ -12,13 +12,24 @@ dnl
 
 AC_DEFUN(jm_FUNC_REALLOC,
 [
+ if test x = y; then
+   dnl This code is deliberately never run via ./configure.
+   dnl FIXME: this is a gross hack to make autoheader put an entry
+   dnl for this symbol in config.h.in.
+   AC_CHECK_FUNCS(DONE_WORKING_REALLOC_CHECK)
+ fi
+ dnl xmalloc.c requires that this symbol be defined so it doesn't
+ dnl mistakenly use a broken realloc -- as it might if this test were omitted.
+ ac_kludge=HAVE_DONE_WORKING_REALLOC_CHECK
+ AC_DEFINE_UNQUOTED($ac_kludge)
+
  AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
   [AC_TRY_RUN([
     char *realloc ();
     int
     main ()
     {
-      exit (realloc (0, 1) ? 0 : 1);
+      exit (realloc (0, 0) ? 0 : 1);
     }
 	  ],
 	 jm_cv_func_working_realloc=yes,