[LLVMbugs] [Bug 7611] New: Not emitting covariant thunk

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7611

           Summary: Not emitting covariant thunk
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dgregor at apple.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Given:

struct A
{
 virtual A* f();
};

struct B: virtual A
{
 virtual A* f();
};

struct C: B
{
 virtual C* f();
};

C* C::f() { return 0; }

clang is omitting the virtual this+virtual return thunk
(_ZTcv0_n12_v0_n16_N1C1fEv), and emitting a virtual this only thunk
(_ZTv0_n12_N1C1fEv) instead.

(thanks to Jason M for reporting this issue!)

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