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Use a proper compiler test for constexpr support

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After GCC 15, C23 became the default version. [1]

Add a proper compiler test for constexpr support to ensure that GCC 15+
invoked with `c_std` set to `none` does not erroneously use the
constexpr shim.

This change does not affect the build in its default configuration
(which uses GNU C11); it is only meant to prepare the build system for
adding C23 elements to the code.

[1]: https://gcc.gnu.org/gcc-15/changes.html
This commit is contained in:
Aydın Mercan 2025-07-28 13:19:41 +00:00
parent e8c3bcc0a2
commit 6ae002f1ae
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1 changed files with 8 additions and 3 deletions
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meson.build
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@ -293,9 +293,14 @@ config.set_quoted('NAMED_CONFFILE', sysconfdir / 'named.conf')
config.set_quoted('CACHEDB_DEFAULT', get_option('cachedb'))
config.set_quoted('ZONEDB_DEFAULT', get_option('zonedb'))
# Shim constexpr for pre-C23
# "ne" => "none"
if c_std.substring(-2) in ['ne', '89', '99', '11', '17', '18']
constexpr_test = '''
static constexpr int r = 0;
int main(void) {
return r;
}
'''
if not cc.compiles(constexpr_test, name: 'usage of constexpr')
config.set('constexpr', 'static const')
endif