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 51 AC_DEFUN([AX_CHECK_COMPILER_FLAGS], 52 [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX 53 AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1]) 54 dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname: 55 AS_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]) 69 eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]) 70 AC_MSG_RESULT($ax_check_compiler_flags) 71 if test "x$ax_check_compiler_flags" = xyes; then 72 m4_default([$2], :) 73 else 74 m4_default([$3], :) 75 fi 76 ])dnl AX_CHECK_COMPILER_FLAGS