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 #   Copying and distribution of this file, with or without modification, are
  32 #   permitted in any medium without royalty provided the copyright notice
  33 #   and this notice are preserved.  This file is offered as-is, without any
  34 #   warranty.
  35
  36 #serial 7
  37
  38 AC_DEFUN([AX_APPEND_LINK_FLAGS],
  39 [AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
  40 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
  41 for flag in $1; do
  42   AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
  43 done
  44 ])dnl AX_APPEND_LINK_FLAGS