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- # ===========================================================================
- # http://www.nongnu.org/autoconf-archive/ax_check_compiler_flags.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
- #
- # DESCRIPTION
- #
- # Check whether the given compiler FLAGS work with the current language's
- # compiler, or whether they give an error. (Warnings, however, are
- # ignored.)
- #
- # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
- # success/failure.
- #
- # LICENSE
- #
- # Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
- # Copyright (c) 2009 Matteo Frigo
- #
- # 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.
-
- AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
- [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
- AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
- dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
- AS_LITERAL_IF([$1],
- [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
- ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
- _AC_LANG_PREFIX[]FLAGS="$1"
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
- AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
- AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
- _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
- [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
- _AC_LANG_PREFIX[]FLAGS="$1"
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
- eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
- eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
- _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
- eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
- AC_MSG_RESULT($ax_check_compiler_flags)
- if test "x$ax_check_compiler_flags" = xyes; then
- m4_default([$2], :)
- else
- m4_default([$3], :)
- fi
- ])dnl AX_CHECK_COMPILER_FLAGS
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