69258491d2
Rather than selecting the errno implementation based on the platform which doesn't provide the necessary flexibility, make it configurable. The errno value location is returned by `int *__llvm_libc_errno()` which is a common design used by other C libraries.
libc Documentation ================== The libc documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBC_INCLUDE_DOCS=ON After configuring libc with these options the make rule `docs-libc-html` should be available.