llvm-project

8cbd8f04 - [libc++] Add scripts to build and test libc++ at a specified commit (#158104)

[libc++] Add scripts to build and test libc++ at a specified commit (#158104) This is useful to perform historical analyses, bisections or establish a benchmarking baseline after making some changes on a branch. For example, one can run benchmarks against `main` and easily compare them to the results on the current feature branch with: libcxx/utils/test-at-commit --commit $(git merge-base main HEAD) \ -B build/baseline -- <lit args> libcxx/utils/libcxx-lit build/candidate <lit args> libcxx/utils/compare-benchmarks \ <(libcxx/utils/consolidate-benchmarks build/baseline) \ <(libcxx/utils/consolidate-benchmarks build/candidate) Doing this without these scripts would require checking out the desired baseline, setting up the build directory and running the tests manually. With these scripts, this can automatically be automated without dirtying the current checkout.