[SCM] GNU Autoconf source repository branch, master, updated. v2.69-126-g785c3df

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 785c3dff655e8d0607f2380e00460c9b72cd2edf
Author: Paul Eggert <address@hidden>
Date:   Tue Sep 2 11:43:32 2014 -0700

    autoconf: port 'restrict' to GCC 4.2.1
    
    * lib/autoconf/c.m4 (AC_C_RESTRICT): Detect GCC bug 14050.
    Problem reported by Marco Munari for OpenBSD 5.5.

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

Summary of changes:
 lib/autoconf/c.m4 |   23 +++++++++++++----------
 1 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index a944529..a565339 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1853,19 +1853,22 @@ fi
 # Otherwise, define "restrict" to be empty.
 AN_IDENTIFIER([restrict], [AC_C_RESTRICT])
 AC_DEFUN([AC_C_RESTRICT],
-[AC_CACHE_CHECK([for C/C++ restrict keyword], ac_cv_c_restrict,
+[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
   [ac_cv_c_restrict=no
    # The order here caters to the fact that C++ does not require restrict.
    for ac_kw in __restrict __restrict__ _Restrict restrict; do
-     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
-      [[typedef int * int_ptr;
-       int foo (int_ptr $ac_kw ip) {
-       return ip[0];
-       }]],
-      [[int s[1];
-       int * $ac_kw t = s;
-       t[0] = 0;
-       return foo(t)]])],
+     AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM(
+        [[typedef int *int_ptr;
+          int foo (int_ptr $ac_kw ip) { return ip[0]; }
+          int bar (int [$ac_kw]); /* Catch GCC bug 14050.  */
+          int bar (int [$ac_kw ip]) { return ip[0]; }
+        ]],
+        [[int s[1];
+          int *$ac_kw t = s;
+          t[0] = 0;
+          return foo (t) + bar (t);
+        ]])],
       [ac_cv_c_restrict=$ac_kw])
      test "$ac_cv_c_restrict" != no && break
    done


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