acinclude/ax_check_compiler_flags.m4
author Sam Lantinga <slouken@libsdl.org>
Mon, 16 Oct 2017 15:22:40 -0700
changeset 11629 ec9b9e71f51b
parent 5029 5d7d48157be7
permissions -rw-r--r--
Fixed compiler warning on iOS
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# ===========================================================================
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#  http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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#   AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
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#
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# DESCRIPTION
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#
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#   Check whether the given compiler FLAGS work with the current language's
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#   compiler, or whether they give an error. (Warnings, however, are
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#   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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# LICENSE
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#
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#   Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
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#   Copyright (c) 2009 Matteo Frigo
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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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#serial 9
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AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
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[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
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dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
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AS_LITERAL_IF([$1],
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  [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
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      ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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      _AC_LANG_PREFIX[]FLAGS="$1"
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      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
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        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
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      _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
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  [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
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   _AC_LANG_PREFIX[]FLAGS="$1"
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   AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
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     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
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   _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
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eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
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AC_MSG_RESULT($ax_check_compiler_flags)
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if test "x$ax_check_compiler_flags" = xyes; then
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	m4_default([$2], :)
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else
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	m4_default([$3], :)
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fi
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])dnl AX_CHECK_COMPILER_FLAGS