Index: lib/Sema/AnalysisBasedWarnings.cpp
===================================================================
--- lib/Sema/AnalysisBasedWarnings.cpp
+++ lib/Sema/AnalysisBasedWarnings.cpp
@@ -2080,10 +2080,10 @@
   //     time.
   DiagnosticsEngine &Diags = S.getDiagnostics();
 
-  // Do not do any analysis for declarations in system headers if we are
-  // going to just ignore them.
-  if (Diags.getSuppressSystemWarnings() &&
-      S.SourceMgr.isInSystemHeader(D->getLocation()))
+  // Do not do any analysis if we are going to just ignore them.
+  if (Diags.getIgnoreAllWarnings() ||
+      (Diags.getSuppressSystemWarnings() &&
+       S.SourceMgr.isInSystemHeader(D->getLocation())))
     return;
 
   // For code in dependent contexts, we'll do this at instantiation time.