Hi,

I tried to build libcxx/libcxxabi using MUSL. Compiler is clang.

The build issues I got:

1) In libcxx, it complains that some pthread structure is not completely 
initialized.

2) Some types like max_align_t are already defined in clang's include.

3) libcxx can't find it's own math.h

A patch is attached. Please review if the changes are correct.


Thank,

Weiming




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