1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 4dea717f98..8763f7aa77 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -4710,10 +4710,11 @@ void darwin::Link::ConstructJob(Compilation &C, const JobAction &JA,
   Args.AddAllArgs(CmdArgs, options::OPT_L);
 
   SanitizerArgs Sanitize(getToolChain().getDriver(), Args);
-  // If we're building a dynamic lib with -fsanitize=address, unresolved
-  // symbols may appear. Mark all of them as dynamic_lookup.
-  // Linking executables is handled in lib/Driver/ToolChains.cpp.
-  if (Sanitize.needsAsanRt()) {
+  // If we're building a dynamic lib with -fsanitize=address, or
+  // -fsanitize=undefined, unresolved symbols may appear. Mark all
+  // of them as dynamic_lookup. Linking executables is handled in
+  // lib/Driver/ToolChains.cpp.
+  if (Sanitize.needsAsanRt() || Sanitize.needsUbsanRt()) {
     if (Args.hasArg(options::OPT_dynamiclib) ||
         Args.hasArg(options::OPT_bundle)) {
       CmdArgs.push_back("-undefined");