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ba8c96593c
Summary: I initially thought that it would be convenient to automatically link these libraries like they are for standard C/C++ targets. However, this created issues when trying to use C++ as a GPU target. This patch moves the logic to now implicitly pass it as part of the offloading toolchain instead, if found. This means that the user needs to set the target toolchain for the link job for automatic detection, but can still be done manually via `-Xoffload-linker -lc`.
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.