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1 | # =========================================================================== |
2 | # http://www.gnu.org/software/autoconf-archive/ax_tls.html | |
3 | # =========================================================================== | |
4 | # | |
5 | # SYNOPSIS | |
6 | # | |
7 | # AX_TLS([action-if-found], [action-if-not-found]) | |
8 | # | |
9 | # DESCRIPTION | |
10 | # | |
11 | # Provides a test for the compiler support of thread local storage (TLS) | |
12 | # extensions. Defines TLS if it is found. Currently knows about GCC/ICC | |
13 | # and MSVC. I think SunPro uses the same as GCC, and Borland apparently | |
14 | # supports either. | |
15 | # | |
16 | # LICENSE | |
17 | # | |
18 | # Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk> | |
19 | # Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com> | |
20 | # | |
21 | # This program is free software: you can redistribute it and/or modify it | |
22 | # under the terms of the GNU General Public License as published by the | |
23 | # Free Software Foundation, either version 3 of the License, or (at your | |
24 | # option) any later version. | |
25 | # | |
26 | # This program is distributed in the hope that it will be useful, but | |
27 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
29 | # Public License for more details. | |
30 | # | |
31 | # You should have received a copy of the GNU General Public License along | |
32 | # with this program. If not, see <http://www.gnu.org/licenses/>. | |
33 | # | |
34 | # As a special exception, the respective Autoconf Macro's copyright owner | |
35 | # gives unlimited permission to copy, distribute and modify the configure | |
36 | # scripts that are the output of Autoconf when processing the Macro. You | |
37 | # need not follow the terms of the GNU General Public License when using | |
38 | # or distributing such scripts, even though portions of the text of the | |
39 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
40 | # all other use of the material that constitutes the Autoconf Macro. | |
41 | # | |
42 | # This special exception to the GPL applies to versions of the Autoconf | |
43 | # Macro released by the Autoconf Archive. When you make and distribute a | |
44 | # modified version of the Autoconf Macro, you may extend this special | |
45 | # exception to the GPL to apply to your modified version as well. | |
46 | ||
450b9709 MD |
47 | #serial 11 |
48 | ||
49 | # Define m4_ifblank and m4_ifnblank macros from introduced in | |
50 | # autotools 2.64 m4sugar.m4 if using an earlier autotools. | |
51 | ||
52 | ifdef([m4_ifblank], [], [ | |
53 | m4_define([m4_ifblank], | |
54 | [m4_if(m4_translit([[$1]], [ ][ ][ | |
55 | ]), [], [$2], [$3])]) | |
56 | ]) | |
57 | ||
58 | ||
59 | ifdef([m4_ifnblank], [], [ | |
60 | m4_define([m4_ifnblank], | |
61 | [m4_if(m4_translit([[$1]], [ ][ ][ | |
62 | ]), [], [$3], [$2])]) | |
63 | ]) | |
a767fdc3 MD |
64 | |
65 | AC_DEFUN([AX_TLS], [ | |
66 | AC_MSG_CHECKING(for thread local storage (TLS) class) | |
67 | AC_CACHE_VAL(ac_cv_tls, [ | |
68 | ax_tls_keywords="__thread __declspec(thread) none" | |
69 | for ax_tls_keyword in $ax_tls_keywords; do | |
70 | AS_CASE([$ax_tls_keyword], | |
71 | [none], [ac_cv_tls=none ; break], | |
75478b32 MD |
72 | [AC_TRY_LINK( |
73 | [$ax_tls_keyword int foo;], | |
74 | [++foo;], | |
a767fdc3 | 75 | [ac_cv_tls=$ax_tls_keyword ; break], |
75478b32 | 76 | [ac_cv_tls=none] |
a767fdc3 MD |
77 | )]) |
78 | done | |
79 | ]) | |
80 | AC_MSG_RESULT($ac_cv_tls) | |
81 | ||
82 | AS_IF([test "$ac_cv_tls" != "none"], | |
83 | AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here]) | |
84 | m4_ifnblank([$1], [$1]), | |
85 | m4_ifnblank([$2], [$2]) | |
86 | ) | |
87 | ]) |