1 # ===========================================================================
2 # https://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
3 # ===========================================================================
7 # AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
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
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.
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.
22 # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
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.
29 # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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.
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.
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/>.
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.
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.
59 AC_DEFUN([AX_APPEND_LINK_FLAGS],
60 [AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
61 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
63 AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
65 ])dnl AX_APPEND_LINK_FLAGS