fix the clang __builtin_unreachable emulation
Previously, it would evaluate its argument twice, which resulted in
bugs.
diff --git a/aos/build/aos.gypi b/aos/build/aos.gypi
index ed7ff63..f6fefd5 100644
--- a/aos/build/aos.gypi
+++ b/aos/build/aos.gypi
@@ -311,7 +311,7 @@
],
'defines': [
# This tells clang's optimizer the same thing.
- '__builtin_assume_aligned(p, a)=(((uintptr_t(p) % (a)) == 0) ? (p) : (__builtin_unreachable(), (p)))',
+ '__builtin_assume_aligned(p, a)=({ const typeof(p) my_p_ = (p); ((((uintptr_t)my_p_ % (a)) == 0u) ? my_p_ : (__builtin_unreachable(), (my_p_))); })',
],
},
],