feupdateenv
===========

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

Gnulib module: fenv-environment

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: FreeBSD 5.2.1, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, IRIX 6.5, Solaris 9, Cygwin 1.7.7, MSVC 14, Android 4.4.

  * This function crashes when given the argument FE_DFL_ENV on some platforms: glibc 2.37/riscv64.

  * This function does not work on some platforms: glibc 2.5/ia64, FreeBSD 12.2/arm64.

  * This function forgets about the currently set floating-point exception flags on some platforms: Mac OS X 10.5/i386, Mac OS X 10.5/x86_64.

  * This function does not restore the floating-point exception trap bits on some platforms: musl libc/i386, musl libc/x86_64, AIX 7.3, Solaris 10 and 11, mingw 10.

  * This function does not trigger traps on glibc 2.37/hppa, musl libc/s390x, NetBSD 9.3/powerpc.

  * This function may fail on some platforms: MSVC 14.

Portability problems not fixed by Gnulib: