https://gcc.gnu.org/g:3d61ec632f9292fb7642865d8b588bb82d51d466

commit r17-5286-g3d61ec632f9292fb7642865d8b588bb82d51d466
Author: Sam James <[email protected]>
Date:   Sun Oct 11 20:15:54 2026 +0100

    config: sync ax_check_define.m4 from autoconf-archive
    
    config/ChangeLog:
    
            * ax_check_define.m4: Update to serial 12.
    
    libgfortran/ChangeLog:
    
            * configure: Regenerate.

Diff:
---
 config/ax_check_define.m4 | 39 ++++++++++-----------------------------
 libgfortran/configure     |  1 +
 2 files changed, 11 insertions(+), 29 deletions(-)

diff --git a/config/ax_check_define.m4 b/config/ax_check_define.m4
index 4bc694861c07..ef15e7130057 100644
--- a/config/ax_check_define.m4
+++ b/config/ax_check_define.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_check_define.html
+#     https://www.gnu.org/software/autoconf-archive/ax_check_define.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -18,33 +18,12 @@
 #
 #   Copyright (c) 2008 Guido U. Draheim <[email protected]>
 #
-#   This program is free software; you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation; either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
 
-#serial 8
+#serial 12
 
 AU_ALIAS([AC_CHECK_DEFINED], [AC_CHECK_DEFINE])
 AC_DEFUN([AC_CHECK_DEFINE],[
@@ -53,6 +32,7 @@ AC_CACHE_CHECK([for $1 defined], ac_var,
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
   #ifdef $1
   int ok;
+  (void)ok;
   #else
   choke me
   #endif
@@ -68,6 +48,7 @@ AC_CACHE_CHECK([for $2 defined in $1], ac_var,
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$1>]], [[
   #ifdef $2
   int ok;
+  (void)ok;
   #else
   choke me
   #endif
@@ -82,8 +63,8 @@ AC_CACHE_CHECK([for $2], ac_var,
 dnl AC_LANG_FUNC_LINK_TRY
 [AC_LINK_IFELSE([AC_LANG_PROGRAM([$1
                 #undef $2
-                char $2 ();],[
-                char (*f) () = $2;
+                char $2 (void);],[
+                char (*f) (void) = $2;
                 return f != $2; ])],
                 [AS_VAR_SET(ac_var, yes)],
                 [AS_VAR_SET(ac_var, no)])])
diff --git a/libgfortran/configure b/libgfortran/configure
index e531d3616842..c7d2c6666bf3 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -32036,6 +32036,7 @@ main ()
 
   #ifdef _SOFT_FLOAT
   int ok;
+  (void)ok;
   #else
   choke me
   #endif

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