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Annotation of embedaddon/libnet/m4/ax_check_link_flag.m4, revision 1.1

1.1     ! misho       1: # ===========================================================================
        !             2: #    https://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@gmx.de>
        !            30: #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@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 <https://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 5
        !            59: 
        !            60: AC_DEFUN([AX_CHECK_LINK_FLAG],
        !            61: [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
        !            62: AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
        !            63: AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
        !            64:   ax_check_save_flags=$LDFLAGS
        !            65:   LDFLAGS="$LDFLAGS $4 $1"
        !            66:   AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
        !            67:     [AS_VAR_SET(CACHEVAR,[yes])],
        !            68:     [AS_VAR_SET(CACHEVAR,[no])])
        !            69:   LDFLAGS=$ax_check_save_flags])
        !            70: AS_VAR_IF(CACHEVAR,yes,
        !            71:   [m4_default([$2], :)],
        !            72:   [m4_default([$3], :)])
        !            73: AS_VAR_POPDEF([CACHEVAR])dnl
        !            74: ])dnl AX_CHECK_LINK_FLAGS