[SCM] GNU Autoconf source repository branch, master, updated. v2.68-73-g6cd9f12

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 6cd9f12520b0d6f76d3230d7565feba1ecf29497
Author: Paul Eggert <address@hidden>
Date:   Sun Jun 19 22:33:03 2011 -0700

    * lib/autoconf/functions.m4 (_AC_LIBOBJ_ALLOCA): Be even smarter.
    
    GCC was too smart for the previous patch.  See
    <http://lists.gnu.org/archive/html/bug-autoconf/2011-06/msg00035.html>.

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

Summary of changes:
 ChangeLog                 |    6 ++++++
 lib/autoconf/functions.m4 |   15 +++++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index e0e52ce..466b8a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-06-19  Paul Eggert  <address@hidden>
+
+       * lib/autoconf/functions.m4 (_AC_LIBOBJ_ALLOCA): Be even smarter.
+       GCC was too smart for the previous patch.  See
+       <http://lists.gnu.org/archive/html/bug-autoconf/2011-06/msg00035.html>.
+
 2011-06-18  Paul Eggert  <address@hidden>
 
        * lib/autoconf/functions.m4 (_AC_LIBOBJ_ALLOCA): Try to outsmart GCC.
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4
index 3156887..cbc3413 100644
--- a/lib/autoconf/functions.m4
+++ b/lib/autoconf/functions.m4
@@ -325,17 +325,20 @@ AC_CACHE_CHECK([stack direction for C alloca],
 [AC_RUN_IFELSE([AC_LANG_SOURCE(
 [AC_INCLUDES_DEFAULT
 int
-find_stack_direction (char *addr)
+find_stack_direction (int *addr, int depth)
 {
-  char dummy;
-  return (! addr ? find_stack_direction (&dummy)
-          : addr < &dummy ? 1 : -1);
+  int dir, dummy = 0;
+  if (! addr)
+    addr = &dummy;
+  *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1;
+  dir = depth ? find_stack_direction (addr, depth - 1) : 0;
+  return dir + dummy;
 }
 
 int
-main (void)
+main (int argc, char **argv)
 {
-  return find_stack_direction (0) < 0;
+  return find_stack_direction (0, argc + !argv + 20) < 0;
 }])],
               [ac_cv_c_stack_direction=1],
               [ac_cv_c_stack_direction=-1],


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