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10.651 modfl

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

Gnulib module: modfl or modfl-ieee

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

• This function is missing on some platforms: FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, HP-UX 11, Solaris 9, Cygwin 1.7.x, Android 4.4.
• This function is only defined as a macro with arguments on some platforms: MSVC 14.
• This function produces wrong results on some platforms: NetBSD 10.0/arm64.

Portability problems fixed by Gnulib module modfl-ieee:

• This function has problems with infinite arguments on some platforms: mingw.

Portability problems not fixed by Gnulib: