[llvm-bugs] [Bug 33358] New: libunwind left-shifts negative number

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33358

            Bug ID: 33358
           Summary: libunwind left-shifts negative number
           Product: libc++abi
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: liuw at liuw.name
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

While building the rumprun project, which contains a copy of NetBSD source
code, which contains a copy of LLVM libunwind, I encountered the following
error with gcc 6.3 on Debian Stretch.

/local/work/Rump-kernels/rumprun/src-netbsd/sys/lib/libunwind/AddressSpace.hpp:
In member function '__int64_t _Unwind::LocalAddressSpace::getSLEB128(_Unwind::
LocalAddressSpace::pint_t&, _Unwind::LocalAddressSpace::pint_t)':
/local/work/Rump-kernels/rumprun/src-netbsd/sys/lib/libunwind/AddressSpace.hpp:143:27:
error: left shift of negative value [-Werror=shift-negative-value]
       result |= (-1LL) << bit;
                           ^~~
cc1plus: all warnings being treated as errors

*** Failed target:  libunwind.o

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