Fix missing __muloti4 function with UBSAN
llvm-svn: 369483
diff --git a/libcxx/src/filesystem/int128_builtins.cpp b/libcxx/src/filesystem/int128_builtins.cpp
index a55540f..ed531ee 100644
--- a/libcxx/src/filesystem/int128_builtins.cpp
+++ b/libcxx/src/filesystem/int128_builtins.cpp
@@ -18,7 +18,7 @@
#if !defined(_LIBCPP_HAS_NO_INT128)
-extern "C" __attribute__((no_sanitize("undefined")))
+extern "C" __attribute__((no_sanitize("undefined"))) _LIBCPP_FUNC_VIS
__int128_t __muloti4(__int128_t a, __int128_t b, int* overflow) {
const int N = (int)(sizeof(__int128_t) * CHAR_BIT);
const __int128_t MIN = (__int128_t)1 << (N - 1);