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ax_check_compile_flag.m4 (3241B)
1 # =========================================================================== 2 # http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html 3 # =========================================================================== 4 # 5 # SYNOPSIS 6 # 7 # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS]) 8 # 9 # DESCRIPTION 10 # 11 # Check whether the given FLAG works with the current language's compiler 12 # or gives an error. (Warnings, however, are ignored) 13 # 14 # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on 15 # success/failure. 16 # 17 # If EXTRA-FLAGS is defined, it is added to the current language's default 18 # flags (e.g. CFLAGS) when the check is done. The check is thus made with 19 # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to 20 # force the compiler to issue an error when a bad flag is given. 21 # 22 # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 23 # macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 24 # 25 # LICENSE 26 # 27 # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 28 # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> 29 # 30 # This program is free software: you can redistribute it and/or modify it 31 # under the terms of the GNU General Public License as published by the 32 # Free Software Foundation, either version 3 of the License, or (at your 33 # option) any later version. 34 # 35 # This program is distributed in the hope that it will be useful, but 36 # WITHOUT ANY WARRANTY; without even the implied warranty of 37 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 38 # Public License for more details. 39 # 40 # You should have received a copy of the GNU General Public License along 41 # with this program. If not, see <http://www.gnu.org/licenses/>. 42 # 43 # As a special exception, the respective Autoconf Macro's copyright owner 44 # gives unlimited permission to copy, distribute and modify the configure 45 # scripts that are the output of Autoconf when processing the Macro. You 46 # need not follow the terms of the GNU General Public License when using 47 # or distributing such scripts, even though portions of the text of the 48 # Macro appear in them. The GNU General Public License (GPL) does govern 49 # all other use of the material that constitutes the Autoconf Macro. 50 # 51 # This special exception to the GPL applies to versions of the Autoconf 52 # Macro released by the Autoconf Archive. When you make and distribute a 53 # modified version of the Autoconf Macro, you may extend this special 54 # exception to the GPL to apply to your modified version as well. 55 56 #serial 2 57 58 AC_DEFUN([AX_CHECK_COMPILE_FLAG], 59 [AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX 60 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 61 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 62 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 63 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 64 AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 65 [AS_VAR_SET(CACHEVAR,[yes])], 66 [AS_VAR_SET(CACHEVAR,[no])]) 67 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 68 AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], 69 [m4_default([$2], :)], 70 [m4_default([$3], :)]) 71 AS_VAR_POPDEF([CACHEVAR])dnl 72 ])dnl AX_CHECK_COMPILE_FLAGS