mstorsjo wrote:

> I also bisected errors on Windows, down to this commit.
> 
> The errors show up when running the compiler-rt testsuite, like this: 
> https://github.com/mstorsjo/llvm-mingw/actions/runs/11356888872/job/31598676534
>  A number of tests fail, where `llvm-cov` errors out with `profile uses zlib 
> compression but the profile reader was built without zlib support`.
> 
> This can be reproduced with something as small as `llvm-cov show 
> coverage_comments.cpp.exe -instr-profile coverage_comments.cpp.tmp.profdata`. 
> Binaries of `llvm-cov` from before this change work fine, while binaries from 
> after it produce this error.
This issue can be reproduced with a few prebuilt files: 
https://martin.st/temp/profile/

Download those three files, build `llvm-cov` (on Linux or anywhere), and 
execute this:
```
$ llvm-cov show coverage_comments.cpp.exe -instr-profile 
coverage_comments.cpp.tmp.profdata
```

Before this breaking change, you'll get this:
```
error: C:/path/to/llvm-project/compiler-rt/test/profile/coverage_comments.cpp: 
No such file or directory
warning: The file 
'C:/path/to/llvm-project/compiler-rt/test/profile/coverage_comments.cpp' isn't 
covered.
```
After this change, you instead get this:
```
error: failed to load coverage: 'coverage_comments.cpp.exe': failed to 
uncompress data (zlib)
```

Can someone revert this change to get things back into working order?

https://github.com/llvm/llvm-project/pull/111332
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