Fix: lttng: track-untrack: error assigned to wrong variable
[lttng-tools.git] / m4 / ax_check_link_flag.m4
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1# ===========================================================================
2# https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
8#
9# DESCRIPTION
10#
11# Check whether the given FLAG works with the linker or gives an error.
12# (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 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_LINK_IFELSE.
23#
24# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
25# macro in sync with AX_CHECK_{PREPROC,COMPILE}_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#
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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.
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6333b87b 37#serial 6
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38
39AC_DEFUN([AX_CHECK_LINK_FLAG],
40[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
41AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
42AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
43 ax_check_save_flags=$LDFLAGS
44 LDFLAGS="$LDFLAGS $4 $1"
45 AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
46 [AS_VAR_SET(CACHEVAR,[yes])],
47 [AS_VAR_SET(CACHEVAR,[no])])
48 LDFLAGS=$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_LINK_FLAGS
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