[cfe-dev] ParseClassSpecifier: can "unions" inherit?

Ted Kremenek kremenek at apple.com
Thu Sep 4 09:01:27 PDT 2008

I just noticed the following code fragment in ParseClassSpecifier:

   // Parse the tag portion of this.
   DeclTy *TagDecl = Actions.ActOnTag(CurScope, TagType, TK, StartLoc,  
                                      NameLoc, Attr);

   // Parse the optional base clause (C++ only).
   if (getLang().CPlusPlus && Tok.is(tok::colon)) {

It appears from the code that the 'if' branch can be taken even if the  
tag decl is a union.  Is this valid in the C++ grammar?  That is, can  
there be a "base clause" for unions in C++, and if so, what does that  

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