source: trunk/m4/ax_append_link_flags.m4

Last change on this file was 3782, checked in by Peter, 2 years ago

upgrade to autoconf-archive-2019.01.06

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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
38AC_DEFUN([AX_APPEND_LINK_FLAGS],
39[AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
40AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
41for flag in $1; do
42  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
43done
44])dnl AX_APPEND_LINK_FLAGS
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