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The building of the std module has been moved from `params.py` and `dsl.py` to a `lit.local.cfg` for the entire test suite. In theory this change allows testing modules in most configurations, except: - combined with clang modules - C++ versions that don't support the std module Currently only C++23 with all parts enabled works. C++26 is expected to work properly with CMake 3.27. That versions of CMake knows how to invoke clang using C++26. The parts disabled modi of libc++ have not been modularized yet. It still is the goal that in the future CMake will be able to do the work done in `lit.local.cfg`. Doing this in CMake would require a more mature libc++ implementation. Thanks a lot to @ldionne for giving hints how to enable modules in a `lit.local.cfg`. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D157625