This might be a stupid question, because why would they design it for a library if it's only for compilers that already support float128.
I just want to make sure before I download the library. Couldn't find the answer online. Here's what I'm referring to. It says that it's a "very thin wrapper" around GCC's and Intel's 128-bit floating-point types and that makes me think it's dependent on them existing and won't work for Visual C++.