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-rw-r--r--third_party/base/numerics/safe_math_impl.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/third_party/base/numerics/safe_math_impl.h b/third_party/base/numerics/safe_math_impl.h
index 4bcc67188c..61f18d2b2a 100644
--- a/third_party/base/numerics/safe_math_impl.h
+++ b/third_party/base/numerics/safe_math_impl.h
@@ -44,7 +44,11 @@ struct UnsignedOrFloatForSize<Numeric, false, true> {
};
// Probe for builtin math overflow support on Clang and version check on GCC.
-#if defined(__has_builtin)
+#if defined(EMSCRIPTEN)
+// Emscripten Clang reports that it has the builtins, it may be lowered to an
+// instruction that is unsupported in asm.js
+#define USE_OVERFLOW_BUILTINS (0)
+#elif defined(__has_builtin)
#define USE_OVERFLOW_BUILTINS (__has_builtin(__builtin_add_overflow))
#elif defined(__GNUC__)
#define USE_OVERFLOW_BUILTINS (__GNUC__ >= 5)