When instantiating a function that was declared via a typedef, e.g.,

    typedef int functype(int, int);
    functype func;

also instantiate the synthesized function parameters for the resulting
function declaration. 

With this change, Boost.Wave builds and passes all of its regression
tests.

llvm-svn: 103025

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 8b851b21eac..da8480633d5 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -1169,6 +1169,27 @@ TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
     return 0;
   QualType T = TInfo->getType();
 
+  // \brief If the type of this function is not *directly* a function
+  // type, then we're instantiating the a function that was declared
+  // via a typedef, e.g.,
+  //
+  //   typedef int functype(int, int);
+  //   functype func;
+  //
+  // In this case, we'll just go instantiate the ParmVarDecls that we
+  // synthesized in the method declaration.
+  if (!isa<FunctionProtoType>(T)) {
+    assert(!Params.size() && "Instantiating type could not yield parameters");
+    for (unsigned I = 0, N = D->getNumParams(); I != N; ++I) {
+      ParmVarDecl *P = SemaRef.SubstParmVarDecl(D->getParamDecl(I), 
+                                                TemplateArgs);
+      if (!P)
+        return 0;
+
+      Params.push_back(P);
+    }
+  }
+
   NestedNameSpecifier *Qualifier = D->getQualifier();
   if (Qualifier) {
     Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier,