Return to ax_check_link_flag.m4 CVS log

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

Annotation of embedaddon/libnet/m4/ax_check_link_flag.m4, revision 1.1.1.1

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