m4/ax_append_link_flags.m4

   1 # ===========================================================================
   2 #   https://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   For every FLAG1, FLAG2 it is checked whether the linker works with the
  12 #   flag.  If it does, the flag is added FLAGS-VARIABLE
  13 #
  14 #   If FLAGS-VARIABLE is not specified, the linker's flags (LDFLAGS) is
  15 #   used. During the check the flag is always added to the linker's flags.
  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_COMPILE_IFELSE.
  23 #
  24 #   NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
  25 #   Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
  26 #
  27 # LICENSE
  28 #
  29 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
  30 #
  31 #   This program is free software: you can redistribute it and/or modify it
  32 #   under the terms of the GNU General Public License as published by the
  33 #   Free Software Foundation, either version 3 of the License, or (at your
  34 #   option) any later version.
  35 #
  36 #   This program is distributed in the hope that it will be useful, but
  37 #   WITHOUT ANY WARRANTY; without even the implied warranty of
  38 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  39 #   Public License for more details.
  40 #
  41 #   You should have received a copy of the GNU General Public License along
  42 #   with this program. If not, see <https://www.gnu.org/licenses/>.
  43 #
  44 #   As a special exception, the respective Autoconf Macro's copyright owner
  45 #   gives unlimited permission to copy, distribute and modify the configure
  46 #   scripts that are the output of Autoconf when processing the Macro. You
  47 #   need not follow the terms of the GNU General Public License when using
  48 #   or distributing such scripts, even though portions of the text of the
  49 #   Macro appear in them. The GNU General Public License (GPL) does govern
  50 #   all other use of the material that constitutes the Autoconf Macro.
  51 #
  52 #   This special exception to the GPL applies to versions of the Autoconf
  53 #   Macro released by the Autoconf Archive. When you make and distribute a
  54 #   modified version of the Autoconf Macro, you may extend this special
  55 #   exception to the GPL to apply to your modified version as well.
  56
  57 #serial 6
  58
  59 AC_DEFUN([AX_APPEND_LINK_FLAGS],
  60 [AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
  61 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
  62 for flag in $1; do
  63   AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
  64 done
  65 ])dnl AX_APPEND_LINK_FLAGS