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1# from http://autoconf-archive.cryp.to/ax_tls.html
2#
3# This was licensed under the GPL with the following exception:
4#
5# As a special exception, the respective Autoconf Macro's copyright
6# owner gives unlimited permission to copy, distribute and modify the
7# configure scripts that are the output of Autoconf when processing
8# the Macro. You need not follow the terms of the GNU General Public
9# License when using or distributing such scripts, even though
10# portions of the text of the Macro appear in them. The GNU General
11# Public License (GPL) does govern all other use of the material that
12# constitutes the Autoconf Macro.
13#
14# This special exception to the GPL applies to versions of the
15# Autoconf Macro released by the Autoconf Macro Archive. When you make
16# and distribute a modified version of the Autoconf Macro, you may
17# extend this special exception to the GPL to apply to your modified
18# version as well.
19#
20AC_DEFUN([AX_TLS], [
21  AC_MSG_CHECKING(for thread local storage (TLS) class)
22  AC_CACHE_VAL(ac_cv_tls, [
23    ax_tls_keywords="__thread __declspec(thread) none"
24    for ax_tls_keyword in $ax_tls_keywords; do
25       case $ax_tls_keyword in
26          none) ac_cv_tls=none ; break ;;
27          *)
28             AC_TRY_COMPILE(
29                [#include <stdlib.h>
30                 static void
31                 foo(void) {
32                 static ] $ax_tls_keyword [ int bar;
33                 exit(1);
34                 }],
35                 [],
36                 [ac_cv_tls=$ax_tls_keyword ; break],
37                 ac_cv_tls=none
38             )
39          esac
40    done
41])
42
43  if test "$ac_cv_tls" != "none"; then
44    dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
45    AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
46  fi
47  AC_MSG_RESULT($ac_cv_tls)
48])
49
50# ===========================================================================
51#         http://www.nongnu.org/autoconf-archive/check_gnu_make.html
52# ===========================================================================
53#
54# SYNOPSIS
55#
56#   CHECK_GNU_MAKE()
57#
58# DESCRIPTION
59#
60#   This macro searches for a GNU version of make. If a match is found, the
61#   makefile variable `ifGNUmake' is set to the empty string, otherwise it
62#   is set to "#". This is useful for including a special features in a
63#   Makefile, which cannot be handled by other versions of make. The
64#   variable _cv_gnu_make_command is set to the command to invoke GNU make
65#   if it exists, the empty string otherwise.
66#
67#   Here is an example of its use:
68#
69#   Makefile.in might contain:
70#
71#       # A failsafe way of putting a dependency rule into a makefile
72#       $(DEPEND):
73#               $(CC) -MM $(srcdir)/*.c > $(DEPEND)
74#
75#       @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
76#       @ifGNUmake@ include $(DEPEND)
77#       @ifGNUmake@ endif
78#
79#   Then configure.in would normally contain:
80#
81#       CHECK_GNU_MAKE()
82#       AC_OUTPUT(Makefile)
83#
84#   Then perhaps to cause gnu make to override any other make, we could do
85#   something like this (note that GNU make always looks for GNUmakefile
86#   first):
87#
88#       if  ! test x$_cv_gnu_make_command = x ; then
89#               mv Makefile GNUmakefile
90#               echo .DEFAULT: > Makefile ;
91#               echo \  $_cv_gnu_make_command \$@ >> Makefile;
92#       fi
93#
94#   Then, if any (well almost any) other make is called, and GNU make also
95#   exists, then the other make wraps the GNU make.
96#
97# LICENSE
98#
99#   Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
100#
101#   Copying and distribution of this file, with or without modification, are
102#   permitted in any medium without royalty provided the copyright notice
103#   and this notice are preserved.
104#
105# Note: Modified by Ted Ts'o to add @ifNotGNUMake@
106
107AC_DEFUN(
108        [CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
109                _cv_gnu_make_command='' ;
110dnl Search all the common names for GNU make
111                if test -n "$FORCE_NATIVE_MAKE" ; then
112                   MAKES="make"
113                else
114                   MAKES="make gmake gnumake"
115                fi
116                for a in "$MAKE" $MAKES ; do
117                        if test -z "$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] )
136