| # =========================================================================== |
| # https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html |
| # =========================================================================== |
| # |
| # SYNOPSIS |
| # |
| # AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) |
| # |
| # DESCRIPTION |
| # |
| # Check whether the given FLAG works with the linker or gives an error. |
| # (Warnings, however, are ignored) |
| # |
| # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on |
| # success/failure. |
| # |
| # If EXTRA-FLAGS is defined, it is added to the linker's default flags |
| # when the check is done. The check is thus made with the flags: "LDFLAGS |
| # EXTRA-FLAGS FLAG". This can for example be used to force the linker to |
| # issue an error when a bad flag is given. |
| # |
| # INPUT gives an alternative input source to AC_LINK_IFELSE. |
| # |
| # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this |
| # macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG. |
| # |
| # LICENSE |
| # |
| # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> |
| # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> |
| # |
| # This program is free software: you can redistribute it and/or modify it |
| # under the terms of the GNU General Public License as published by the |
| # Free Software Foundation, either version 3 of the License, or (at your |
| # option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, but |
| # WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| # Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License along |
| # with this program. If not, see <https://www.gnu.org/licenses/>. |
| # |
| # As a special exception, the respective Autoconf Macro's copyright owner |
| # gives unlimited permission to copy, distribute and modify the configure |
| # scripts that are the output of Autoconf when processing the Macro. You |
| # need not follow the terms of the GNU General Public License when using |
| # or distributing such scripts, even though portions of the text of the |
| # Macro appear in them. The GNU General Public License (GPL) does govern |
| # all other use of the material that constitutes the Autoconf Macro. |
| # |
| # This special exception to the GPL applies to versions of the Autoconf |
| # Macro released by the Autoconf Archive. When you make and distribute a |
| # modified version of the Autoconf Macro, you may extend this special |
| # exception to the GPL to apply to your modified version as well. |
| |
| #serial 5 |
| |
| AC_DEFUN([AX_CHECK_LINK_FLAG], |
| [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF |
| AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl |
| AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ |
| ax_check_save_flags=$LDFLAGS |
| LDFLAGS="$LDFLAGS $4 $1" |
| AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], |
| [AS_VAR_SET(CACHEVAR,[yes])], |
| [AS_VAR_SET(CACHEVAR,[no])]) |
| LDFLAGS=$ax_check_save_flags]) |
| AS_VAR_IF(CACHEVAR,yes, |
| [m4_default([$2], :)], |
| [m4_default([$3], :)]) |
| AS_VAR_POPDEF([CACHEVAR])dnl |
| ])dnl AX_CHECK_LINK_FLAGS |