[3JPLW]

Some of the NaN-handling issues are unique, but the compiler availability itself is still a problem.

https://twitter.com/StefanKarpinski/status/12929837172128931...

Since then, GCC has stepped up with this out-of-tree build, but it's still not 100% to my knowledge.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96168