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10.620 modff

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

Gnulib module: modff or modff-ieee

Portability problems fixed by either Gnulib module modff or modff-ieee:

• This function is missing on some platforms: Minix 3.1.8, AIX 5.1, HP-UX 11.
• This function is only defined as a buggy macro with arguments on some platforms: MSVC 14.

Portability problems fixed by Gnulib module modff-ieee:

• This function has problems with a NaN argument on some platforms: NetBSD 5.1, OpenBSD 6.7, Solaris 9, Cygwin.
• This function has problems with infinite arguments on some platforms: IRIX 6.5, mingw.

Portability problems not fixed by Gnulib: