11.1Slukem# ===========================================================================
21.1Slukem#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
31.1Slukem# ===========================================================================
41.1Slukem#
51.1Slukem# SYNOPSIS
61.1Slukem#
71.1Slukem#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
81.1Slukem#
91.1Slukem# DESCRIPTION
101.1Slukem#
111.1Slukem#   Check whether the given FLAG works with the current language's compiler
121.1Slukem#   or gives an error.  (Warnings, however, are ignored)
131.1Slukem#
141.1Slukem#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
151.1Slukem#   success/failure.
161.1Slukem#
171.1Slukem#   If EXTRA-FLAGS is defined, it is added to the current language's default
181.1Slukem#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
191.1Slukem#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
201.1Slukem#   force the compiler to issue an error when a bad flag is given.
211.1Slukem#
221.1Slukem#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
231.1Slukem#
241.1Slukem#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
251.1Slukem#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
261.1Slukem#
271.1Slukem# LICENSE
281.1Slukem#
291.1Slukem#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
301.1Slukem#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
311.1Slukem#
321.1Slukem#   Copying and distribution of this file, with or without modification, are
331.1Slukem#   permitted in any medium without royalty provided the copyright notice
341.1Slukem#   and this notice are preserved.  This file is offered as-is, without any
351.1Slukem#   warranty.
361.1Slukem
371.1Slukem#serial 6
381.1Slukem
391.1SlukemAC_DEFUN([AX_CHECK_COMPILE_FLAG],
401.1Slukem[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
411.1SlukemAS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
421.1SlukemAC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
431.1Slukem  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
441.1Slukem  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
451.1Slukem  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
461.1Slukem    [AS_VAR_SET(CACHEVAR,[yes])],
471.1Slukem    [AS_VAR_SET(CACHEVAR,[no])])
481.1Slukem  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
491.1SlukemAS_VAR_IF(CACHEVAR,yes,
501.1Slukem  [m4_default([$2], :)],
511.1Slukem  [m4_default([$3], :)])
521.1SlukemAS_VAR_POPDEF([CACHEVAR])dnl
531.1Slukem])dnl AX_CHECK_COMPILE_FLAGS
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