29d86e0fe876dc12d18b09d9fd8945fb6c74ab93
[urcu.git] / m4 / ax_append_compile_flags.m4
1 # SPDX-License-Identifier: FSFAP
2 # ============================================================================
3 # https://www.gnu.org/software/autoconf-archive/ax_append_compile_flags.html
4 # ============================================================================
5 #
6 # SYNOPSIS
7 #
8 # AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
9 #
10 # DESCRIPTION
11 #
12 # For every FLAG1, FLAG2 it is checked whether the compiler works with the
13 # flag. If it does, the flag is added FLAGS-VARIABLE
14 #
15 # If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
16 # CFLAGS) is used. During the check the flag is always added to the
17 # current language's flags.
18 #
19 # If EXTRA-FLAGS is defined, it is added to the current language's default
20 # flags (e.g. CFLAGS) when the check is done. The check is thus made with
21 # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
22 # force the compiler to issue an error when a bad flag is given.
23 #
24 # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
25 #
26 # NOTE: This macro depends on the AX_APPEND_FLAG and
27 # AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
28 # AX_APPEND_LINK_FLAGS.
29 #
30 # LICENSE
31 #
32 # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
33 #
34 # Copying and distribution of this file, with or without modification, are
35 # permitted in any medium without royalty provided the copyright notice
36 # and this notice are preserved. This file is offered as-is, without any
37 # warranty.
38
39 #serial 7
40
41 AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
42 [AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
43 AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
44 for flag in $1; do
45 AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
46 done
47 ])dnl AX_APPEND_COMPILE_FLAGS
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