1 files changed, 4 insertions, 1 deletions
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 596037d77222..2d787332a445 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1760,6 +1760,8 @@ HandleSignalMode GetHandleSignalMode(int signum) {
 
 #if !SANITIZER_GO
 void *internal_start_thread(void *(*func)(void *arg), void *arg) {
+  if (&real_pthread_create == 0)
+    return nullptr;
   // Start the thread with signals blocked, otherwise it can steal user signals.
   ScopedBlockSignals block(nullptr);
   void *th;
@@ -1768,7 +1770,8 @@ void *internal_start_thread(void *(*func)(void *arg), void *arg) {
 }
 
 void internal_join_thread(void *th) {
-  real_pthread_join(th, nullptr);
+  if (&real_pthread_join)
+    real_pthread_join(th, nullptr);
 }
 #else
 void *internal_start_thread(void *(*func)(void *), void *arg) { return 0; }