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10.280 fetestexcept

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

Gnulib module: fenv-exceptions-tracking-c99

Portability problems fixed by Gnulib:

• This function is missing on some platforms: FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, Solaris 9, Cygwin 1.7.7, MSVC 9, Android 4.4.
• This function clears the floating-point exception trap bits on some platforms: NetBSD 9.3/x86_64.
• This function is broken on some platforms: Minix 3.3/i386.

Portability problems not fixed by Gnulib: