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meson: Replicate Autotools check for __sync_sub_and_fetch

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The built-in atomic intrinsics are not exactly functions, so it's
incorrect to use has_function to check for them.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2022-06-28 12:30:55 +01:00
parent ec3edd80a6
commit 35eca11708
1 changed files with 13 additions and 2 deletions
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15
meson.build
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@ -615,8 +615,19 @@ endif
config.set('DBUS_VA_COPY', va_copy)
#### Atomic integers
config.set10('DBUS_USE_SYNC', cc.has_function('__sync_sub_and_fetch') ? 1 : false)
# Can't use cc.has_function here because atomic operations are not
# exactly functions
config.set10(
'DBUS_USE_SYNC',
cc.links('''
int main(void)
{
int a = 4;
int b = __sync_sub_and_fetch (&a, 4);
return b;
}
''')
)
config.set10('HAVE_DECL_MSG_NOSIGNAL',
cc.has_header_symbol('sys/socket.h', 'MSG_NOSIGNAL')