Merge branch 'm4-serial-fix' into 'main'

m4: update ax_check_compile_flag.m4 from autoconf-archive

See merge request tpo/core/tor!813

1 files changed, 39 insertions, 37 deletions

diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
index 95df39679e..68fd43d5dd 100644
--- a/m4/ax_check_compile_flag.m4
+++ b/m4/ax_check_compile_flag.m4
@@ -1,43 +1,45 @@
- #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
- #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
- #
- #   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 <https://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.
+# ===========================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
+#   force the compiler to issue an error when a bad flag is given.
+#
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
+#
+#   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 5
- #serial 6
+#serial 7
 
- AC_DEFUN([AX_CHECK_COMPILE_FLAG],
- [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
-AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+AC_CACHE_CHECK([whether the _AC_LANG compiler accepts $1], CACHEVAR, [
   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
   AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],