Dyadic floats were an existing option for float to string conversion, but it had become stale. This patch fixes it up as well as adding proper config options and test support. Due to the test changes this is a followup to #110759
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.