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1 | # SYNOPSIS |
2 | # | |
3 | # AE_CC_ATOMIC_BUILTINS([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) | |
4 | # | |
5 | # LICENSE | |
6 | # | |
7 | # Copyright (c) 2023 Michael Jeanson <mjeanson@efficios.com> | |
8 | # | |
9 | # This program is free software; you can redistribute it and/or modify it | |
10 | # under the terms of the GNU General Public License as published by the | |
11 | # Free Software Foundation; either version 2 of the License, or (at your | |
12 | # option) any later version. | |
13 | # | |
14 | # This program is distributed in the hope that it will be useful, but | |
15 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
17 | # Public License for more details. | |
18 | # | |
19 | # You should have received a copy of the GNU General Public License along | |
20 | # with this program. If not, see <https://www.gnu.org/licenses/>. | |
21 | # | |
22 | # As a special exception, the respective Autoconf Macro's copyright owner | |
23 | # gives unlimited permission to copy, distribute and modify the configure | |
24 | # scripts that are the output of Autoconf when processing the Macro. You | |
25 | # need not follow the terms of the GNU General Public License when using | |
26 | # or distributing such scripts, even though portions of the text of the | |
27 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
28 | # all other use of the material that constitutes the Autoconf Macro. | |
29 | # | |
30 | # This special exception to the GPL applies to versions of the Autoconf | |
31 | # Macro released by the Autoconf Archive. When you make and distribute a | |
32 | # modified version of the Autoconf Macro, you may extend this special | |
33 | # exception to the GPL to apply to your modified version as well. | |
34 | ||
35 | #serial 1 | |
36 | ||
37 | AC_DEFUN([AE_CC_ATOMIC_BUILTINS], [ | |
38 | AC_REQUIRE([AC_PROG_CC]) | |
39 | AC_LANG_PUSH([C]) | |
40 | ||
41 | AC_CACHE_CHECK( | |
42 | [whether $CC supports atomic builtins], | |
43 | [ae_cv_cc_atomic_builtins], | |
44 | [ | |
45 | AC_LINK_IFELSE([ | |
46 | AC_LANG_PROGRAM([ | |
47 | int x, y; | |
48 | ],[ | |
49 | __atomic_store_n(&x, 0, __ATOMIC_RELAXED); | |
50 | __atomic_load_n(&x, __ATOMIC_RELAXED); | |
51 | y = __atomic_exchange_n(&x, 1, __ATOMIC_RELAXED); | |
52 | __atomic_compare_exchange_n(&x, &y, 0, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED); | |
53 | __atomic_add_fetch(&x, 1, __ATOMIC_RELAXED); | |
54 | __atomic_sub_fetch(&x, 1, __ATOMIC_RELAXED); | |
55 | __atomic_and_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
56 | __atomic_or_fetch(&x, 0x01, __ATOMIC_RELAXED); | |
57 | __atomic_thread_fence(__ATOMIC_RELAXED); | |
58 | __atomic_signal_fence(__ATOMIC_RELAXED); | |
59 | ]) | |
60 | ],[ | |
61 | ae_cv_cc_atomic_builtins=yes | |
62 | ],[ | |
63 | ae_cv_cc_atomic_builtins=no | |
64 | ]) | |
65 | ] | |
66 | ) | |
67 | ||
68 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
69 | if test "x$ae_cv_cc_atomic_builtins" = "xyes"; then | |
70 | $1 | |
71 | : | |
72 | else | |
73 | $2 | |
74 | : | |
75 | fi | |
76 | ||
77 | AC_LANG_POP | |
78 | ])dnl AE_CC_ATOMIC_BUILTINS |