[cfe-dev] Failing test SemaCXX/underlying_type.cpp on Mingw/Msys

[Eli Friedman]

On Wed, May 25, 2011 at 10:00 AM, Matthieu Monrocq
<matthieu.monrocq at gmail.com> wrote:
> Hello,
>
> SemaCXX/underlying_type.cpp fails on Mingw/Msys with the following message:
>
>   Assertion failed: (PtrVal & ((1 << PtrTraits::NumLowBitsAvailable)-1)) ==
> 0 && "Pointer is not sufficiently aligned", file
> d:/clang/llvm/include/llvm/ADT/PointerIntPair.h, line 80
>
> From this function:
>
>   void setPointer(PointerTy Ptr) {
>     intptr_t PtrVal
>       = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(Ptr));
>     assert((PtrVal & ((1 << PtrTraits::NumLowBitsAvailable)-1)) == 0 &&
>            "Pointer is not sufficiently aligned");
>     // Preserve all low bits, just update the pointer.
>     Value = PtrVal | (Value & ~PointerBitMask);
>   }
>
> I don't know whether the problem only occurs on mingw/msys or also occurs on
> a "bare" windows system.

Also occurs on bare Windows, at least according to some Apple-internal
buildbots. A backtrace would be helpful.

This is most likely caused by r132017; Sean, any ideas?

-Eli