actions: introduce start session action
[lttng-tools.git] / m4 / ax_check_compile_flag.m4
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1# ===========================================================================
2# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
8#
9# DESCRIPTION
10#
11# Check whether the given FLAG works with the current language's compiler
12# or gives an error. (Warnings, however, are ignored)
13#
14# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
15# success/failure.
16#
17# If EXTRA-FLAGS is defined, it is added to the current language's default
18# flags (e.g. CFLAGS) when the check is done. The check is thus made with
19# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
20# force the compiler to issue an error when a bad flag is given.
21#
22# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
23#
24# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
26#
27# LICENSE
28#
29# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
30# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
31#
32# Copying and distribution of this file, with or without modification, are
33# permitted in any medium without royalty provided the copyright notice
34# and this notice are preserved. This file is offered as-is, without any
35# warranty.
36
37#serial 6
38
39AC_DEFUN([AX_CHECK_COMPILE_FLAG],
40[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
41AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
42AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
43 ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
44 _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
45 AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
46 [AS_VAR_SET(CACHEVAR,[yes])],
47 [AS_VAR_SET(CACHEVAR,[no])])
48 _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
49AS_VAR_IF(CACHEVAR,yes,
50 [m4_default([$2], :)],
51 [m4_default([$3], :)])
52AS_VAR_POPDEF([CACHEVAR])dnl
53])dnl AX_CHECK_COMPILE_FLAGS
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