ax_check_compiler_flags.m4 (3297B)
1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE]) 8# 9# DESCRIPTION 10# 11# Check whether the given compiler FLAGS work with the current language's 12# compiler, or whether they give an error. (Warnings, however, are 13# ignored.) 14# 15# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 16# success/failure. 17# 18# LICENSE 19# 20# Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu> 21# Copyright (c) 2009 Matteo Frigo 22# 23# This program is free software: you can redistribute it and/or modify it 24# under the terms of the GNU General Public License as published by the 25# Free Software Foundation, either version 3 of the License, or (at your 26# option) any later version. 27# 28# This program is distributed in the hope that it will be useful, but 29# WITHOUT ANY WARRANTY; without even the implied warranty of 30# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 31# Public License for more details. 32# 33# You should have received a copy of the GNU General Public License along 34# with this program. If not, see <http://www.gnu.org/licenses/>. 35# 36# As a special exception, the respective Autoconf Macro's copyright owner 37# gives unlimited permission to copy, distribute and modify the configure 38# scripts that are the output of Autoconf when processing the Macro. You 39# need not follow the terms of the GNU General Public License when using 40# or distributing such scripts, even though portions of the text of the 41# Macro appear in them. The GNU General Public License (GPL) does govern 42# all other use of the material that constitutes the Autoconf Macro. 43# 44# This special exception to the GPL applies to versions of the Autoconf 45# Macro released by the Autoconf Archive. When you make and distribute a 46# modified version of the Autoconf Macro, you may extend this special 47# exception to the GPL to apply to your modified version as well. 48 49#serial 9 50 51AC_DEFUN([AX_CHECK_COMPILER_FLAGS], 52[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX 53AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1]) 54dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname: 55AS_LITERAL_IF([$1], 56 [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [ 57 ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS 58 _AC_LANG_PREFIX[]FLAGS="$1" 59 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 60 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes, 61 AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no) 62 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])], 63 [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS 64 _AC_LANG_PREFIX[]FLAGS="$1" 65 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 66 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes, 67 eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no) 68 _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS]) 69eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]) 70AC_MSG_RESULT($ax_check_compiler_flags) 71if test "x$ax_check_compiler_flags" = xyes; then 72 m4_default([$2], :) 73else 74 m4_default([$3], :) 75fi 76])dnl AX_CHECK_COMPILER_FLAGS