[libc-commits] [libc] [libc] Set default visibility for LLVM functions (PR #116686)

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lntue wrote:

also, technically users can use something like `-DLIBC_COMPILE_OPTIONS_DEFAULT="-DLLVM_LIBC_FUNCTION_ATTR=..."` in the cmake invocation if needed?

https://github.com/llvm/llvm-project/pull/116686