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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_check_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
# AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
# AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS])
#
# DESCRIPTION
#
# Check whether the given FLAG works with the current language's
# preprocessor/compiler/linker, or whether they give an error. (Warnings,
# however, are ignored.)
#
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
# success/failure.
#
# If EXTRA-FLAGS is defined, it is added to the current language's default
# flags (e.g. CFLAGS) when the check is done. The check us thus made
# with the following flags: "CFLAGS EXTRA-FLAGS FLAG". EXTRA-FLAGS can
# for example be used to force the compiler to issue an error when a bad
# flag is given.
#
# AX_APPEND_FLAG appends the FLAG to the FLAG-VARIABLE shell variable or
# the current language's flags if not specified. FLAG is not added to
# FLAG-VARIABLE if it is already in the shell variable.
#
# AX_APPEND_COMPILE_FLAGS checks for each FLAG1, FLAG2, etc. using
# AX_CHECK_COMPILE_FLAG and if the check is successful the flag is added
# to the appropriate FLAGS variable with AX_APPEND_FLAG. The
# FLAGS-VARIABLE and EXTRA-FLAGS arguments are the same as in the other
# macros. AX_APPEND_LINK_FLAGS does the same for linker flags.
#
# NOTE: Based on AX_CHECK_COMPILER_FLAGS and AX_CFLAGS_GCC_OPTION.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
# Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
# Copyright (c) 2009 Matteo Frigo
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
# 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.
#serial 2
AC_DEFUN([AX_CHECK_PREPROC_FLAG],
[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
ax_check_save_flags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $4 $1"
AC_PREPROC_IFELSE([AC_LANG_PROGRAM()],
[AS_VAR_SET([CACHEVAR],[yes])],
[AS_VAR_SET([CACHEVAR],[no])])
CPPFLAGS=$ax_check_save_flags])
AS_VAR_IF([CACHEVAR], "yes",
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_PREPROC_FLAGS
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[AS_VAR_SET([CACHEVAR],[yes])],
[AS_VAR_SET([CACHEVAR],[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_VAR_IF([CACHEVAR], "yes",
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS
AC_DEFUN([AX_CHECK_LINK_FLAG],
[AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
ax_check_save_flags=$LDFLAGS
LDFLAGS="$LDFLAGS $4 $1"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[AS_VAR_SET([CACHEVAR],[yes])],
[AS_VAR_SET([CACHEVAR],[no])])
LDFLAGS=$ax_check_save_flags])
AS_VAR_IF([CACHEVAR], "yes",
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_LINK_FLAGS
AC_DEFUN([AX_APPEND_FLAG],
[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
AC_REQUIRE([AC_PROG_GREP])
AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[]FLAGS)])dnl
AS_VAR_SET_IF([FLAGS],
[AS_IF([AS_ECHO(" $[]FLAGS ") | $GREP " $1 " 2>&1 >/dev/null],
[AC_RUN_LOG([: FLAGS already contains $1])],
[AC_RUN_LOG([: FLAGS="$FLAGS $1"])
AS_VAR_APPEND([FLAGS], [" $1"])])],
[AS_VAR_SET([FLAGS],[$1])])
AS_VAR_POPDEF([FLAGS])dnl
])dnl AX_APPEND_FLAG
AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
[for flag in $1; do
AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3])
done
])dnl AX_APPEND_COMPILE_FLAGS
AC_DEFUN([AX_APPEND_LINK_FLAGS],
[for flag in $1; do
AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3])
done
])dnl AX_APPEND_LINK_FLAGS
|
