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Member "libextractor-1.11/m4/ax_check_link_flag.m4" (2 Dec 2018, 3183 Bytes) of package /linux/privat/libextractor-1.11.tar.gz:


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    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