mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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148 lines
6 KiB
Text
148 lines
6 KiB
Text
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_check_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_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
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# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
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# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
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# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
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# AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
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# AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
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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
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# preprocessor/compiler/linker, or whether they give an error. (Warnings,
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# 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 us thus made
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# with the following flags: "CFLAGS EXTRA-FLAGS FLAG". EXTRA-FLAGS can
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# for example be used to force the compiler to issue an error when a bad
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# flag is given.
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#
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# AX_APPEND_FLAG appends the FLAG to the FLAG-VARIABLE shell variable or
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# the current language's flags if not specified. FLAG is not added to
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# FLAG-VARIABLE if it is already in the shell variable.
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#
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# AX_APPEND_COMPILE_FLAGS checks for each FLAG1, FLAG2, etc. using
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# AX_CHECK_COMPILE_FLAG and if the check is successful the flag is added
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# to the appropriate FLAGS variable with AX_APPEND_FLAG. The
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# FLAGS-VARIABLE and EXTRA-FLAGS arguments are the same as in the other
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# macros. AX_APPEND_LINK_FLAGS does the same for linker flags.
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#
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# NOTE: Based on AX_CHECK_COMPILER_FLAGS and AX_CFLAGS_GCC_OPTION.
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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) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
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# Copyright (c) 2009 Matteo Frigo
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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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#serial 2
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AC_DEFUN([AX_CHECK_PREPROC_FLAG],
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[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
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ax_check_save_flags=$CPPFLAGS
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CPPFLAGS="$CPPFLAGS $4 $1"
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AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
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[AS_VAR_SET([CACHEVAR],[yes])],
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[AS_VAR_SET([CACHEVAR],[no])])
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CPPFLAGS=$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_PREPROC_FLAGS
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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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 $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[AS_VAR_SET([CACHEVAR],[yes])],
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[AS_VAR_SET([CACHEVAR],[no])])
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_AC_LANG_PREFIX[]FLAGS=$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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AC_DEFUN([AX_CHECK_LINK_FLAG],
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[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
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AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
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ax_check_save_flags=$LDFLAGS
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LDFLAGS="$LDFLAGS $4 $1"
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AC_LINK_IFELSE([AC_LANG_PROGRAM()],
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[AS_VAR_SET([CACHEVAR],[yes])],
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[AS_VAR_SET([CACHEVAR],[no])])
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LDFLAGS=$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_LINK_FLAGS
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AC_DEFUN([AX_APPEND_FLAG],
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[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
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AC_REQUIRE([AC_PROG_GREP])
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AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[]FLAGS)])dnl
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AS_VAR_SET_IF([FLAGS],
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[AS_IF([AS_ECHO(" $[]FLAGS ") | $GREP " $1 " 2>&1 >/dev/null],
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[AC_RUN_LOG([: FLAGS already contains $1])],
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[AC_RUN_LOG([: FLAGS="$FLAGS $1"])
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AS_VAR_APPEND([FLAGS], [" $1"])])],
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[AS_VAR_SET([FLAGS],[$1])])
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AS_VAR_POPDEF([FLAGS])dnl
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])dnl AX_APPEND_FLAG
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AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
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[for flag in $1; do
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AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3])
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done
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])dnl AX_APPEND_COMPILE_FLAGS
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AC_DEFUN([AX_APPEND_LINK_FLAGS],
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[for flag in $1; do
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AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3])
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done
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])dnl AX_APPEND_LINK_FLAGS
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