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], [INPUT]) 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 # INPUT gives an alternative input source to AC_COMPILE_IFELSE. 23 # 24 # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 25 # macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG. 26 # 27 # LICENSE 28 # 29 # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 30 # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> 31 # 32 # This program is free software: you can redistribute it and/or modify it 33 # under the terms of the GNU General Public License as published by the 34 # Free Software Foundation, either version 3 of the License, or (at your 35 # option) any later version. 36 # 37 # This program is distributed in the hope that it will be useful, but 38 # WITHOUT ANY WARRANTY; without even the implied warranty of 39 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 40 # Public License for more details. 41 # 42 # You should have received a copy of the GNU General Public License along 43 # with this program. If not, see <http://www.gnu.org/licenses/>. 44 # 45 # As a special exception, the respective Autoconf Macro's copyright owner 46 # gives unlimited permission to copy, distribute and modify the configure 47 # scripts that are the output of Autoconf when processing the Macro. You 48 # need not follow the terms of the GNU General Public License when using 49 # or distributing such scripts, even though portions of the text of the 50 # Macro appear in them. The GNU General Public License (GPL) does govern 51 # all other use of the material that constitutes the Autoconf Macro. 52 # 53 # This special exception to the GPL applies to versions of the Autoconf 54 # Macro released by the Autoconf Archive. When you make and distribute a 55 # modified version of the Autoconf Macro, you may extend this special 56 # exception to the GPL to apply to your modified version as well. 57 58 #serial 4 59 60 AC_DEFUN([AX_CHECK_COMPILE_FLAG], 61 [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF 62 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl 63 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ 64 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS 65 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" 66 AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 67 [AS_VAR_SET(CACHEVAR,[yes])], 68 [AS_VAR_SET(CACHEVAR,[no])]) 69 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) 70 AS_VAR_IF(CACHEVAR,yes, 71 [m4_default([$2], :)], 72 [m4_default([$3], :)]) 73 AS_VAR_POPDEF([CACHEVAR])dnl 74 ])dnl AX_CHECK_COMPILE_FLAGS
