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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| # =========================================================================== | ||
| # 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 |
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