More fixes to the handling of CVR-comparisons on array types. Adds a method to

QualType to get CVR-qualifiers through array types, and switches the primary
comparison methods to use it. This may allow simplifying some of the callers of
getUnqualifiedArrayType.

Also fix the normalizing of CV-qualification during template deduction to
normalize through arrays and allow a more qualified deduced array type. This
fixes PR5911.

llvm-svn: 92289

1 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index e31c05cf2af..21f79963bd8 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -375,9 +375,11 @@ DeduceTemplateArguments(ASTContext &Context,
   //     referred to by the reference) can be more cv-qualified than the
   //     transformed A.
   if (TDF & TDF_ParamWithReferenceType) {
-    Qualifiers Quals = Param.getQualifiers();
-    Quals.setCVRQualifiers(Quals.getCVRQualifiers() & Arg.getCVRQualifiers());
-    Param = Context.getQualifiedType(Param.getUnqualifiedType(), Quals);
+    Qualifiers Quals;
+    QualType UnqualParam = Context.getUnqualifiedArrayType(Param, Quals);
+    Quals.setCVRQualifiers(Quals.getCVRQualifiers() &
+                           Arg.getCVRQualifiersThroughArrayTypes());
+    Param = Context.getQualifiedType(UnqualParam, Quals);
   }
 
   // If the parameter type is not dependent, there is nothing to deduce.