Index: lldb/source/Host/common/MainLoop.cpp
===================================================================
--- lldb/source/Host/common/MainLoop.cpp
+++ lldb/source/Host/common/MainLoop.cpp
@@ -137,18 +137,18 @@
 }
 
 sigset_t MainLoop::RunImpl::get_sigmask() {
+  sigset_t sigmask;
 #if SIGNAL_POLLING_UNSUPPORTED
-  return 0;
+  sigemptyset(&sigmask);
 #else
-  sigset_t sigmask;
   int ret = pthread_sigmask(SIG_SETMASK, nullptr, &sigmask);
   assert(ret == 0);
   (void) ret;
 
   for (const auto &sig : loop.m_signals)
     sigdelset(&sigmask, sig.first);
-  return sigmask;
 #endif
+  return sigmask;
 }
 
 #ifdef __ANDROID__