Blame m4/ax_check_compile_flag.m4

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# ===========================================================================
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#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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#
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# DESCRIPTION
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#
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#   Check whether the given FLAG works with the current language's compiler
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#   or gives an error.  (Warnings, however, are ignored)
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#
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#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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#   success/failure.
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#
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#   If EXTRA-FLAGS is defined, it is added to the current language's default
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#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
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#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
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#   force the compiler to issue an error when a bad flag is given.
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#
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#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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#
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#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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#
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# LICENSE
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#
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#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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#   This program is free software: you can redistribute it and/or modify it
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#   under the terms of the GNU General Public License as published by the
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#   Free Software Foundation, either version 3 of the License, or (at your
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#   option) any later version.
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#
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#   This program is distributed in the hope that it will be useful, but
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#   WITHOUT ANY WARRANTY; without even the implied warranty of
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#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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#   Public License for more details.
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#
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#   You should have received a copy of the GNU General Public License along
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#   with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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#   As a special exception, the respective Autoconf Macro's copyright owner
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#   gives unlimited permission to copy, distribute and modify the configure
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#   scripts that are the output of Autoconf when processing the Macro. You
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#   need not follow the terms of the GNU General Public License when using
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#   or distributing such scripts, even though portions of the text of the
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#   Macro appear in them. The GNU General Public License (GPL) does govern
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#   all other use of the material that constitutes the Autoconf Macro.
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#
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#   This special exception to the GPL applies to versions of the Autoconf
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#   Macro released by the Autoconf Archive. When you make and distribute a
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#   modified version of the Autoconf Macro, you may extend this special
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#   exception to the GPL to apply to your modified version as well.
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#serial 5
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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    [AS_VAR_SET(CACHEVAR,[yes])],
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    [AS_VAR_SET(CACHEVAR,[no])])
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  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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AS_VAR_IF(CACHEVAR,yes,
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  [m4_default([$2], :)],
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  [m4_default([$3], :)])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_COMPILE_FLAGS