track whether an error has been emitted.

llvm-svn: 39502

clang/Basic/Diagnostic.cpp

@@ -57,6 +57,8 @@ Diagnostic::Diagnostic(DiagnosticClient &client) : Client(client) {
   ErrorOnExtensions = false;
   // Clear all mappings, setting them to MAP_DEFAULT.
   memset(DiagMappings, 0, sizeof(DiagMappings));
+  
+  ErrorOccurred = false;
 }
 
 /// isNoteWarningOrExtension - Return true if the unmapped diagnostic level of
@@ -126,6 +128,9 @@ void Diagnostic::Report(SourceLocation Pos, unsigned DiagID,
   if (DiagLevel == Diagnostic::Ignored)
     return;
   
+  if (DiagLevel >= Diagnostic::Error)
+    ErrorOccurred = true;
+  
   // Finally, report it.
   Client.HandleDiagnostic(DiagLevel, Pos, (diag::kind)DiagID, Strs, NumStrs,
                           Ranges, NumRanges);

clang/include/clang/Basic/Diagnostic.h

@@ -55,6 +55,10 @@ class Diagnostic {
   /// DiagMappings - Mapping information for diagnostics.  Mapping info is
   /// packed into two bits per diagnostic.
   unsigned char DiagMappings[(diag::NUM_DIAGNOSTICS+3)/4];
+  
+  /// ErrorOccurred - This is set to true when an error is emitted, and is
+  /// sticky.
+  bool ErrorOccurred;
 public:
   explicit Diagnostic(DiagnosticClient &client);
   
@@ -93,6 +97,7 @@ public:
     return (diag::Mapping)((DiagMappings[Diag/4] >> (Diag & 3)*2) & 3);
   }
   
+  bool hasErrorOccurred() const { return ErrorOccurred; }
   
   //===--------------------------------------------------------------------===//
   // Diagnostic classification and reporting interfaces.