4 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/fenv.h.html}
9 Portability problems fixed by Gnulib:
12 This header file is missing on some platforms:
13 FreeBSD 5.2.1, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, Cygwin 1.7.7, MSVC 9.
16 Portability problems not fixed by Gnulib:
19 On MSVC, the values of the rounding direction macros have changed:
20 @c https://github.com/MicrosoftDocs/cpp-docs/issues/4796
21 In MSVC 14, @code{FE_UPWARD} is 0x100 and @code{FE_DOWNWARD} is 0x200,
22 whereas in MSVC 14.30, it's the opposite.