Return to ax_check_link_flag.m4 CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / sudo / m4

1.8.7

    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@gmx.de>
   28: #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@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: