llvm-project

4e007c11 - [lit] [compiler-rt] Add llvm-lit global command cache to speed up test config (#195888)

[lit] [compiler-rt] Add llvm-lit global command cache to speed up test config (#195888) Compiler-rt lit test discovery takes quite a while on Darwin (i.e. the time from when you launch llvm-lit to when the first test runs can be minutes for check-compiler-rt). This appears to be mostly due to subprocess calls during test configuration. This adds a memoized command-runner to llvm-lit, so that lit.cfg.py scripts can re-use the result of feature-detection commands when running multiple test suites at once. I've adopted it for several subprocess calls in compiler-rt. rdar://175893448