diff options
Diffstat (limited to 'ext/raindrops/extconf.rb')
| -rw-r--r-- | ext/raindrops/extconf.rb | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/ext/raindrops/extconf.rb b/ext/raindrops/extconf.rb index 9f5de95..447a90a 100644 --- a/ext/raindrops/extconf.rb +++ b/ext/raindrops/extconf.rb @@ -13,23 +13,20 @@ have_func('rb_thread_blocking_region') have_func('rb_thread_io_blocking_region') checking_for "GCC 4+ atomic builtins" do + # we test CMPXCHG anyways even though we don't need it to filter out + # ancient i386-only targets without CMPXCHG src = <<SRC int main(int argc, char * const argv[]) { - volatile unsigned long i = 0; + unsigned long i = 0; + __sync_lock_test_and_set(&i, 0); + __sync_lock_test_and_set(&i, 1); __sync_add_and_fetch(&i, argc); __sync_sub_and_fetch(&i, argc); return 0; } SRC - if try_run(src) - # some systems target GCC for i386 and don't get the atomic builtins - # when building shared objects - arch = `#{CONFIG['CC']} -dumpmachine`.split(/-/)[0] - if arch == "i386" && $CFLAGS !~ /\b-march=/ - $CFLAGS += " -march=i486 " - end - + if try_link(src) $defs.push(format("-DHAVE_GCC_ATOMIC_BUILTINS")) true else |