add a virtual method to DiagnosticClient to get rid of some fragile

casting in clang-cc.

llvm-svn: 69377

clang/include/clang/Basic/Diagnostic.h

@@ -27,6 +27,7 @@ namespace clang {
   class SourceRange;
   class DiagnosticBuilder;
   class IdentifierInfo;
+  class LangOptions;
   
   // Import the diagnostic enums themselves.
   namespace diag {
@@ -667,6 +668,13 @@ class DiagnosticClient {
 public:
   virtual ~DiagnosticClient();
   
+  /// setLangOptions - This is set by clients of diagnostics when they know the
+  /// language parameters of the diagnostics that may be sent through.  Note
+  /// that this can change over time if a DiagClient has multiple languages sent
+  /// through it.  It may also be set to null (e.g. when processing command line
+  /// options).
+  virtual void setLangOptions(const LangOptions *LO) {}
+  
   /// IncludeInDiagnosticCounts - This method (whose default implementation
   ///  returns true) indicates whether the diagnostics handled by this
   ///  DiagnosticClient should be included in the number of diagnostics

clang/include/clang/Frontend/TextDiagnosticPrinter.h

@@ -50,8 +50,8 @@ public:
       PrintRangeInfo(printRangeInfo),
       PrintDiagnosticOption(printDiagnosticOption) {}
 
-  void SetLangOpts(const LangOptions &LO) {
-    LangOpts = &LO;
+  void setLangOptions(const LangOptions *LO) {
+    LangOpts = LO;
   }
   
   void PrintIncludeStack(SourceLocation Loc, const SourceManager &SM);

clang/tools/clang-cc/clang-cc.cpp

@@ -2301,11 +2301,7 @@ int main(int argc, char **argv) {
     
     // Initialize language options, inferring file types from input filenames.
     LangOptions LangInfo;
-    
-    if (!VerifyDiagnostics)
-      static_cast<TextDiagnosticPrinter*>(TextDiagClient)
-        ->SetLangOpts(LangInfo);
-
+    TextDiagClient->setLangOptions(&LangInfo);
     
     InitializeBaseLanguage();
     LangKind LK = GetLanguage(InFile);
@@ -2346,7 +2342,8 @@ int main(int argc, char **argv) {
     // Process the source file.
     ProcessInputFile(*PP, PPFactory, InFile, ProgAction);
     
-    HeaderInfo.ClearFileInfo();      
+    HeaderInfo.ClearFileInfo();
+    TextDiagClient->setLangOptions(0);
   }
 
   if (Verbose)