vsk added a comment.

In D83592#2170912 <https://reviews.llvm.org/D83592#2170912>, @zequanwu wrote:

> I don't why when using the cmake option 
> `-DLLVM_BUILD_INSTRUMENTED_COVERAGE=On` to test coverage for clang itself, it 
> does tracking comments.
>  Also, with that option on, `llvm-cov` crashes at 
> assertion:`llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp:578: 
> virtual Expected<const char *> (anonymous 
> namespace)::VersionedCovMapFuncRecordReader<llvm::coverage::Version4, 
> unsigned long, llvm::support::little>::readCoverageHeader(const char *, const 
> char *, BinaryCoverageReader::DecompressedData &) [Version = 
> llvm::coverage::Version4, IntPtrT = unsigned long, Endian = 
> llvm::support::little]: Assertion 
> `(CovMapVersion)CovHeader->getVersion<Endian>() == Version' failed.`


Just to double-check: are you using llvm-{cov,profdata} binaries from the 
stage1 llvm build to produce reports for stage2 (coverage-instrumented) 
binaries?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D83592/new/

https://reviews.llvm.org/D83592



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