2005-06-27  Stepan Kasal  <address@hidden>

	* doc/autoconf.texi (Particular Functions) <AC_FUNC_ALLOCA>:
	With GNU C, define alloca only if it wasn't defined yet.

Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.918
diff -u -r1.918 autoconf.texi
--- doc/autoconf.texi	24 Jun 2005 00:54:01 -0000	1.918
+++ doc/autoconf.texi	27 Jun 2005 11:14:48 -0000
@@ -4021,7 +4021,9 @@
 #if HAVE_ALLOCA_H
 # include <alloca.h>
 #elif defined __GNUC__
-# define alloca __builtin_alloca
+# ifndef alloca
+#  define alloca __builtin_alloca
+# endif
 #elif defined _AIX
 # define alloca __alloca
 #elif defined _MSC_VER