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382b707e52
In recent versions of Clang, using -std=c++20 (and later) implies LSV when compiling with modules. This change resulted in making our LSV job redundant with the regular modules job, which uses the latest Standard. This patch increases the coverage of our CI without increasing its cost by pinning the LSV job to use C++17, which normally doesn't use LSV. A related question is whether we should add coverage for non-LSV builds using Clang modules.
libc++ / libc++abi configuration caches
This directory contains CMake caches for the supported configurations of libc++. Some of the configurations are specific to a vendor, others are generic and not tied to any vendor.
While we won't explicitly work to break configurations not listed here, any configuration not listed here is not explicitly supported. If you use or ship libc++ under a configuration not listed here, you should work with the libc++ maintainers to make it into a supported configuration and add it here.
Similarly, adding any new configuration that's not already covered must be discussed with the libc++ maintainers as it entails a maintenance burden.