“llvm-libc” C Standard Library — LLVM 13 documentation
This is a proposal to start llvm-libc, an implementation of the C standard library targeting C17 and above, as part of the LLVM project. llvm-libc will also provide platform specific extensions as relevant. For example, on Linux it also provides pthreads, librt and other POSIX extension libraries.
from Pocket https://llvm.org/docs/Proposals/LLVMLibC.html
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