[llvm-bugs] [Bug 41890] New: error: assembler label '' can not be undefined

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https://bugs.llvm.org/show_bug.cgi?id=41890

            Bug ID: 41890
           Summary: error: assembler label '' can not be undefined
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tiagomacarios at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

One of our open-source projects is failing to build with clang in 32 bits:
https://github.com/microsoft/wil/issues/7

I tracked down the minimal repro to be:

#include <intrin.h>
void f()
{
 __annotation(L"");
 __int2c();
}

clang-cl.exe -c -m32 -Zi a.cpp
error: assembler label '' can not be undefined
error: assembler label '' can not be undefined
2 errors generated.

It works fine without the -m32 flag.

RNK take on the issue:
It looks like I misclassified the label as an EH_LABEL, and some pass is
dropping it. I'm not sure why the -m32 flag matters, but I don't think it will
be hard to fix.

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