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