| # =========================================================================== |
| # 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> |
| # |
| # Copying and distribution of this file, with or without modification, are |
| # permitted in any medium without royalty provided the copyright notice |
| # and this notice are preserved. This file is offered as-is, without any |
| # warranty. |
| |
| #serial 6 |
| |
| 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 |