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[clang] Allow CLANG_MODULE_CACHE_PATH env var to override module caching behavior

Authored by abrachet on May 30 2022, 1:45 PM.



CLANG_MODULE_CACHE_PATH can be used to change where clang should put the module cache, or can be set to "" to disable caching entirely.

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abrachet created this revision.May 30 2022, 1:45 PM
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abrachet requested review of this revision.May 30 2022, 1:45 PM

To give a bit of context behind this change, we have noticed that as of D125331, a single run of libc++ test suites generates 3.1G of data inside Clang's module cache. This is problematic in CI where we quickly run out of disk space as a consequence. We would like to have a way to either change the cache path to a temporary location, or disable it altogether, that could be used without having to pass an extra flag to every compiler invocation.

phosek added inline comments.May 30 2022, 3:18 PM

This needs a trailing slash.


This needs a trailing slash.

abrachet updated this revision to Diff 432992.May 30 2022, 4:15 PM
abrachet marked 2 inline comments as done.
abrachet added inline comments.

The classic "harmless" cosmetic change that I don't need to run tests again for :)

phosek accepted this revision.Jun 6 2022, 2:00 PM

LGTM this would be really valuable for our use cases, but please wait a few more days to give other reviewers a chance to respond.

This revision is now accepted and ready to land.Jun 6 2022, 2:00 PM
This revision was automatically updated to reflect the committed changes.
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