[cfe-dev] How to report bug when compiler hangs

[Steven Peters via cfe-dev]

Hello,

I've been digging into a compilation problem using the version of clang
distrubuted with XCode 9 on macOS High Sierra. I narrowed the problem down
to the transition from `-O1` to `-O2` for a target cpu of core2, and then I
further narrowed it down to the `-vectorize-loops` option for clang. The
challenge is that this problem manifests with clang failing to terminate. I
don't know if it's a deadlock or getting stuck in an infinite loop, but I
didn't see any guidance in the support documents about how to submit a bug
report in a case like this.

Current discussion of the compilation failure:
https://github.com/bulletphysics/bullet3/issues/1347

~~~
$ cc --version
Apple LLVM version 9.0.0 (clang-900.0.37)
Target: x86_64-apple-darwin17.0.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
~~~

Thanks for your time.

Regards,
Steve Peters
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