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# =========================================================================== |
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# http://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 <http://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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|
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#serial 4 |
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|
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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 |
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