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meson: error out if atomic ops would be available with -march=i486

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Same as autotools build.
This commit is contained in:
Tim-Philipp Müller 2017-06-14 23:57:11 +01:00 committed by Matthias Clasen
parent 0689231bd6
commit 4268372fae
1 changed files with 9 additions and 0 deletions
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meson.build
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@ -1198,6 +1198,12 @@ else
endif
glibconfig_conf.set('G_ATOMIC_OP_MEMORY_BARRIER_NEEDED', glib_memory_barrier_needed)
# Note that the atomic ops are only available with GCC on x86 when
# using -march=i486 or higher. If we detect that the atomic ops are
# not available but would be available given the right flags, we want
# to abort and advise the user to fix their CFLAGS. It's better to do
# that then to silently fall back on emulated atomic ops just because
# the user had the wrong build environment.
atomictest = '''void func() {
volatile int atomic = 2;
__sync_bool_compare_and_swap (&atomic, 2, 3);
@ -1206,6 +1212,9 @@ atomictest = '''void func() {
if cc.compiles(atomictest)
glibconfig_conf.set('G_ATOMIC_LOCK_FREE', true)
else
if host_machine.cpu_family() == 'x86' and cc.compiles(atomictest, args : '-march=i486')
error('GLib must be built with -march=i486 or later.')
endif
glibconfig_conf.set('G_ATOMIC_LOCK_FREE', false)
endif