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meson: Add exception for atomic ops test for Android

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Some compilers, particularly Android on armv5 and old versions of Clang
provide atomic ops, but don't define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
so we need to define it ourselves.

This matches what configure does, with the exception that now it's only
done for Android since clang defines __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
now.

https://bugzilla.gnome.org/show_bug.cgi?id=796325
This commit is contained in:
Nirbheek Chauhan 2018-05-22 11:45:37 +05:30
parent 0b60f2589f
commit 74af384153
1 changed files with 15 additions and 2 deletions
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meson.build
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@ -1460,15 +1460,28 @@ atomictest = '''int main() {
}
'''
atomicdefine = '''
#ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
#error "compiler has atomic ops, but doesn't define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4"
#endif
'''
# We know that we can always use real ("lock free") atomic operations with MSVC
if cc.get_id() == 'msvc' or cc.links(atomictest, name : 'atomic ops')
glibconfig_conf.set('G_ATOMIC_LOCK_FREE', true)
have_atomic_lock_free = true
if host_system == 'android' and not cc.compiles(atomicdefine, name : 'atomic ops define')
# When building for armv5 on Android, gcc 4.9 provides
# __sync_bool_compare_and_swap but doesn't define
# __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
glib_conf.set('__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4', true)
endif
else
have_atomic_lock_free = false
if host_machine.cpu_family() == 'x86' and cc.links(atomictest, args : '-march=i486')
error('GLib must be built with -march=i486 or later.')
endif
glibconfig_conf.set('G_ATOMIC_LOCK_FREE', false)
endif
glibconfig_conf.set('G_ATOMIC_LOCK_FREE', have_atomic_lock_free)
# === Threads ===