Microsoft endorses and works on clang-cl, though I wouldn't say they give it as much attention as their own compiler. As for compatibility, I don't think it's a

Microsoft endorses and works on clang-cl, though I wouldn't say they give it as much attention as their own compiler. As for compatibility, I don't think it's a huge issue, if they never changed the compiler again, it would probably still generate working binaries for the next decade, including PDBs.