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], [INPUT]) 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 # INPUT gives an alternative input source to AC_LINK_IFELSE. 23 # 24 # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this 25 # macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG. 26 # 27 # LICENSE 28 # 29 # Copyright (c) 2008 Guido U. Draheim <guidod (a] gmx.de> 30 # Copyright (c) 2011 Maarten Bosmans <mkbosmans (a] 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 3 59 60 AC_DEFUN([AX_CHECK_LINK_FLAG], 61 [AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl 62 AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ 63 ax_check_save_flags=$LDFLAGS 64 LDFLAGS="$LDFLAGS $4 $1" 65 AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], 66 [AS_VAR_SET(CACHEVAR,[yes])], 67 [AS_VAR_SET(CACHEVAR,[no])]) 68 LDFLAGS=$ax_check_save_flags]) 69 AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], 70 [m4_default([$2], :)], 71 [m4_default([$3], :)]) 72 AS_VAR_POPDEF([CACHEVAR])dnl 73 ])dnl AX_CHECK_LINK_FLAGS 74
