r241705 - AST: Avoid reading an unitialized value

[Justin Bogner]

Author: bogner
Date: Wed Jul  8 13:32:26 2015
New Revision: 241705

URL: http://llvm.org/viewvc/llvm-project?rev=241705&view=rev
Log:
AST: Avoid reading an unitialized value

Desugar doesn't necessarily initialize ShouldAKA, but as of r241542 it
may read it. Fix the misuse of the API and initialize this before
passing it in.

Found by ubsan.

Modified:
    cfe/trunk/lib/AST/ASTDiagnostic.cpp

Modified: cfe/trunk/lib/AST/ASTDiagnostic.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ASTDiagnostic.cpp?rev=241705&r1=241704&r2=241705&view=diff
==============================================================================
--- cfe/trunk/lib/AST/ASTDiagnostic.cpp (original)
+++ cfe/trunk/lib/AST/ASTDiagnostic.cpp Wed Jul  8 13:32:26 2015
@@ -192,8 +192,8 @@ ConvertTypeToDiagnosticString(ASTContext
     if (CompareCanTy == CanTy)
       continue;  // Same canonical types
     std::string CompareS = CompareTy.getAsString(Context.getPrintingPolicy());
-    bool aka;
-    QualType CompareDesugar = Desugar(Context, CompareTy, aka);
+    bool ShouldAKA = false;
+    QualType CompareDesugar = Desugar(Context, CompareTy, ShouldAKA);
     std::string CompareDesugarStr =
         CompareDesugar.getAsString(Context.getPrintingPolicy());
     if (CompareS != S && CompareDesugarStr != S)