[SCM] GNU Autoconf source repository branch, master, updated. v2.68-132-g015ecc5

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 015ecc5018782c18fb20d0259c8a56cc258b9ab4
Author: Paul Eggert <address@hidden>
Date:   Mon Jan 23 00:10:55 2012 -0800

    doc: work around mingw-w64 alloca problem with example
    
    * doc/autoconf.texi (Particular Functions): In example code for
    alloca, do not re-#define alloca.  This works around a mingw-w64
    problem reported by Vincent Torri in
    <http://lists.gnu.org/archive/html/autoconf/2012-01/msg00018.html>.

-----------------------------------------------------------------------

Summary of changes:
 doc/autoconf.texi |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 247a46c..82837a2 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4863,15 +4863,15 @@ like the following, to declare it properly.
 #endif
 #ifdef HAVE_ALLOCA_H
 # include <alloca.h>
-#elif defined __GNUC__
-# define alloca __builtin_alloca
-#elif defined _AIX
-# define alloca __alloca
-#elif defined _MSC_VER
-# include <malloc.h>
-# define alloca _alloca
-#else
-# ifndef HAVE_ALLOCA
+#elif !defined alloca
+# ifdef __GNUC__
+#  define alloca __builtin_alloca
+# elif defined _AIX
+#  define alloca __alloca
+# elif defined _MSC_VER
+#  include <malloc.h>
+#  define alloca _alloca
+# elif !defined HAVE_ALLOCA
 #  ifdef  __cplusplus
 extern "C"
 #  endif


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