| Thomas Tsou | 3eaae80 | 2013-08-20 19:31:14 -0400 | [diff] [blame] | 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 |