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1# Extracted from the package's shipped aclocal.m4. Custom macros should be in
2# acinclude.m4 so running aclocal doesn't blow them away.
3#
4# Signed-off-by: Ross Burton <ross.burton@intel.com>
5
6# from http://autoconf-archive.cryp.to/ax_tls.html
7#
8# This was licensed under the GPL with the following exception:
9#
10# As a special exception, the respective Autoconf Macro's copyright
11# owner gives unlimited permission to copy, distribute and modify the
12# configure scripts that are the output of Autoconf when processing
13# the Macro. You need not follow the terms of the GNU General Public
14# License when using or distributing such scripts, even though
15# portions of the text of the Macro appear in them. The GNU General
16# Public License (GPL) does govern all other use of the material that
17# constitutes the Autoconf Macro.
18#
19# This special exception to the GPL applies to versions of the
20# Autoconf Macro released by the Autoconf Macro Archive. When you make
21# and distribute a modified version of the Autoconf Macro, you may
22# extend this special exception to the GPL to apply to your modified
23# version as well.
24#
25AC_DEFUN([AX_TLS], [
26 AC_MSG_CHECKING(for thread local storage (TLS) class)
27 AC_CACHE_VAL(ac_cv_tls, [
28 ax_tls_keywords="__thread __declspec(thread) none"
29 for ax_tls_keyword in $ax_tls_keywords; do
30 case $ax_tls_keyword in
31 none) ac_cv_tls=none ; break ;;
32 *)
33 AC_TRY_COMPILE(
34 [#include <stdlib.h>
35 static void
36 foo(void) {
37 static ] $ax_tls_keyword [ int bar;
38 exit(1);
39 }],
40 [],
41 [ac_cv_tls=$ax_tls_keyword ; break],
42 ac_cv_tls=none
43 )
44 esac
45 done
46])
47
48 if test "$ac_cv_tls" != "none"; then
49 dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
50 AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
51 fi
52 AC_MSG_RESULT($ac_cv_tls)
53])
54
55# ===========================================================================
56# http://www.nongnu.org/autoconf-archive/check_gnu_make.html
57# ===========================================================================
58#
59# SYNOPSIS
60#
61# CHECK_GNU_MAKE()
62#
63# DESCRIPTION
64#
65# This macro searches for a GNU version of make. If a match is found, the
66# makefile variable `ifGNUmake' is set to the empty string, otherwise it
67# is set to "#". This is useful for including a special features in a
68# Makefile, which cannot be handled by other versions of make. The
69# variable _cv_gnu_make_command is set to the command to invoke GNU make
70# if it exists, the empty string otherwise.
71#
72# Here is an example of its use:
73#
74# Makefile.in might contain:
75#
76# # A failsafe way of putting a dependency rule into a makefile
77# $(DEPEND):
78# $(CC) -MM $(srcdir)/*.c > $(DEPEND)
79#
80# @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
81# @ifGNUmake@ include $(DEPEND)
82# @ifGNUmake@ endif
83#
84# Then configure.in would normally contain:
85#
86# CHECK_GNU_MAKE()
87# AC_OUTPUT(Makefile)
88#
89# Then perhaps to cause gnu make to override any other make, we could do
90# something like this (note that GNU make always looks for GNUmakefile
91# first):
92#
93# if ! test x$_cv_gnu_make_command = x ; then
94# mv Makefile GNUmakefile
95# echo .DEFAULT: > Makefile ;
96# echo \ $_cv_gnu_make_command \$@ >> Makefile;
97# fi
98#
99# Then, if any (well almost any) other make is called, and GNU make also
100# exists, then the other make wraps the GNU make.
101#
102# LICENSE
103#
104# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
105#
106# Copying and distribution of this file, with or without modification, are
107# permitted in any medium without royalty provided the copyright notice
108# and this notice are preserved.
109#
110# Note: Modified by Ted Ts'o to add @ifNotGNUMake@
111
112AC_DEFUN(
113 [CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
114 _cv_gnu_make_command='' ;
115dnl Search all the common names for GNU make
116 for a in "$MAKE" make gmake gnumake ; do
117 if test -z "$a" ; then continue ; fi ;
118 if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then
119 _cv_gnu_make_command=$a ;
120 break;
121 fi
122 done ;
123 ) ;
124dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
125 if test "x$_cv_gnu_make_command" != "x" ; then
126 ifGNUmake='' ;
127 ifNotGNUmake='#' ;
128 else
129 ifGNUmake='#' ;
130 ifNotGNUmake='' ;
131 AC_MSG_RESULT("Not found");
132 fi
133 AC_SUBST(ifGNUmake)
134 AC_SUBST(ifNotGNUmake)
135] )