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[babeltrace.git] / 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
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