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10.279 fesetround

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/fesetround.html

Gnulib module: fenv-rounding

Portability problems fixed by Gnulib:

• This function is missing on some platforms: FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, Solaris 9, Cygwin 1.7.7, MSVC 9, Android 4.4.
• This function does not work on some platforms: MSVC 14.

Portability problems not fixed by Gnulib:

• The rounding mode has no effect on long double operations on some platforms: FreeBSD/arm64, NetBSD/sparc64, OpenBSD/arm64, OpenBSD/mips64.