Index: compiler-rt/lib/asan/asan_posix.cc
===================================================================
--- compiler-rt/lib/asan/asan_posix.cc
+++ compiler-rt/lib/asan/asan_posix.cc
@@ -35,11 +35,7 @@
 
 void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
   ScopedDeadlySignal signal_scope(GetCurrentThread());
-  // Write the first message using fd=2, just in case.
-  // It may actually fail to write in case stderr is closed.
-  internal_write(2, SanitizerToolName, internal_strlen(SanitizerToolName));
-  static const char kDeadlySignal[] = ":DEADLYSIGNAL\n";
-  internal_write(2, kDeadlySignal, sizeof(kDeadlySignal) - 1);
+  StartReportDeadlySignal();
   SignalContext sig = SignalContext::Create(siginfo, context);
   if (IsStackOverflow(((siginfo_t *)siginfo)->si_code, sig))
     ReportStackOverflow(sig);
Index: compiler-rt/lib/sanitizer_common/sanitizer_common.h
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -308,9 +308,11 @@
 // Functions related to signal handling.
 typedef void (*SignalHandlerType)(int, void *, void *);
 HandleSignalMode GetHandleSignalMode(int signum);
-bool IsStackOverflow(int code, const SignalContext &sig);
 void InstallDeadlySignalHandlers(SignalHandlerType handler);
 const char *DescribeSignalOrException(int signo);
+// Signal reporting.
+void StartReportDeadlySignal();
+bool IsStackOverflow(int code, const SignalContext &sig);
 // Alternative signal stack (POSIX-only).
 void SetAlternateSignalStack();
 void UnsetAlternateSignalStack();
Index: compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
+++ compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
@@ -322,6 +322,7 @@
 }
 
 #if !SANITIZER_GO
+
 bool IsStackOverflow(int code, const SignalContext &sig) {
   // Access at a reasonable offset above SP, or slightly below it (to account
   // for x86_64 or PowerPC redzone, ARM push of multiple registers, etc) is
@@ -366,8 +367,17 @@
   // unaligned memory access.
   return IsStackAccess && (code == si_SEGV_MAPERR || code == si_SEGV_ACCERR);
 }
+
 #endif  //! SANITIZER_GO
 
+void StartReportDeadlySignal() {
+  // Write the first message using fd=2, just in case.
+  // It may actually fail to write in case stderr is closed.
+  internal_write(2, SanitizerToolName, internal_strlen(SanitizerToolName));
+  static const char kDeadlySignal[] = ":DEADLYSIGNAL\n";
+  internal_write(2, kDeadlySignal, sizeof(kDeadlySignal) - 1);
+}
+
 } // namespace __sanitizer
 
 #endif // SANITIZER_POSIX
Index: compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
+++ compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
@@ -215,6 +215,7 @@
   MaybeInstallSigaction(SIGFPE, handler);
   MaybeInstallSigaction(SIGILL, handler);
 }
+
 #endif  // SANITIZER_GO
 
 bool IsAccessibleMemoryRange(uptr beg, uptr size) {