[LLVMbugs] [Bug 17859] New: mishandling of cv-qualification dropping in covariant return types

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17859

            Bug ID: 17859
           Summary: mishandling of cv-qualification dropping in covariant
                    return types
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Clang accepts this ill-formed code:

typedef int X;
struct A { virtual const X *f(); };
struct B : A { virtual X *f(); };

Per 10.3/7, a covariant return type can only drop a cv-qualifier if it is a
pointer or reference to *class* type.

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