[libcxx-commits] [libcxx] [libc++] Handle Newlib and picolibc using options (PR #152968)

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inglorion wrote:

Some open questions:

1. This now requires an option to be set. We can probably autodetect the correct value. Should we? How would we implement that?
2. Instead of having boolean options for various libcs, should we have a single option to select the libc flavor?

https://github.com/llvm/llvm-project/pull/152968