1 # =========================================================================== 2 # http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html 3 # =========================================================================== 4 # 5 # SYNOPSIS 6 # 7 # AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS]) 8 # 9 # DESCRIPTION 10 # 11 # Check whether the given FLAG works with the linker or gives an error. 12 # (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 linker's default flags 18 # when the check is done. The check is thus made with the flags: "LDFLAGS 19 # EXTRA-FLAGS FLAG". This can for example be used to force the linker to 20 # 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,COMPILE}_FLAG. 24 # 25 # LICENSE 26 # 27 # Copyright (c) 2008 Guido U. Draheim <guidod (a] gmx.de> 28 # Copyright (c) 2011 Maarten Bosmans <mkbosmans (a] 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_LINK_FLAG], 59 [AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl 60 AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ 61 ax_check_save_flags=$LDFLAGS 62 LDFLAGS="$LDFLAGS $4 $1" 63 AC_LINK_IFELSE([AC_LANG_PROGRAM()], 64 [AS_VAR_SET(CACHEVAR,[yes])], 65 [AS_VAR_SET(CACHEVAR,[no])]) 66 LDFLAGS=$ax_check_save_flags]) 67 AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], 68 [m4_default([$2], :)], 69 [m4_default([$3], :)]) 70 AS_VAR_POPDEF([CACHEVAR])dnl 71 ])dnl AX_CHECK_LINK_FLAGS 72
