Index: lib/sanitizer_common/sanitizer_common_libcdep.cc
===================================================================
--- lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -37,6 +37,10 @@
   if (SANITIZER_WINDOWS)
     return false;
 
+  // The macOS syslog viewer doesn't know what to do with color codes.
+  if (common_flags()->log_to_syslog)
+    return false;
+
   const char *flag = common_flags()->color;
   return internal_strcmp(flag, "always") == 0 ||
          (internal_strcmp(flag, "auto") == 0 && report_file.SupportsColors());
Index: lib/ubsan/ubsan_diag.cc
===================================================================
--- lib/ubsan/ubsan_diag.cc
+++ lib/ubsan/ubsan_diag.cc
@@ -100,8 +100,14 @@
   const char *Note() const { return Black(); }
   const char *EndNote() const { return Default(); }
 };
+
+void PrintToLog(const char *S) {
+  Printf("%s", S);
+  LogFullErrorReport(S);
 }
 
+} // end anonymous namespace
+
 SymbolizedStack *__ubsan::getSymbolizedLocation(uptr PC) {
   InitAsStandaloneIfNecessary();
   return Symbolizer::GetOrInit()->SymbolizePC(PC);
@@ -263,7 +269,7 @@
   Max = addNoOverflow(Min, BytesToShow);
 
   if (!IsAccessibleMemoryRange(Min, Max - Min)) {
-    Printf("<memory cannot be printed>\n");
+    PrintToLog("<memory cannot be printed>\n");
     return;
   }
 
@@ -319,7 +325,8 @@
     Spaces += 2;
   }
 
-  Printf("%s", Buffer.data());
+  PrintToLog(Buffer.data());
+
   // FIXME: Print names for anything we can identify within the line:
   //
   //  * If we can identify the memory itself as belonging to a particular
@@ -356,7 +363,7 @@
   RenderText(&Buffer, Message, Args);
 
   Buffer.append("%s\n", Decor.Default());
-  Printf("%s", Buffer.data());
+  PrintToLog(Buffer.data());
 
   if (Loc.isMemoryLocation())
     PrintMemorySnippet(Decor, Loc.getMemoryLocation(), Ranges, NumRanges, Args);
Index: test/ubsan/TestCases/Misc/log-path_test.cc
===================================================================
--- test/ubsan/TestCases/Misc/log-path_test.cc
+++ test/ubsan/TestCases/Misc/log-path_test.cc
@@ -20,6 +20,10 @@
 // RUN: %env_ubsan_opts=log_path='"%t.log"'  %run %t 4
 // RUN: not cat %t.log.*
 
+// We should print out a report even if we're logging to syslog.
+// RUN: %env_ubsan_opts=log_to_syslog=1 %run %t -4 2> %t.out
+// RUN: FileCheck %s --check-prefix=CHECK-ERROR < %t.out
+
 // FIXME: log_path is not supported on Windows yet.
 // XFAIL: win32