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10.961 round

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

Gnulib module: round or round-ieee

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

• This function is missing on some platforms: FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, Solaris 9, MSVC 9.
• This function is not declared on some platforms: glibc 2.8.
• This functions returns a wrong result for x = 1/2 - 2^-54 on some platforms: NetBSD 3.0, AIX 7.1.

Portability problems fixed by Gnulib module round-ieee:

• This function returns a positive zero for an argument between -0.5 and 0 on some platforms: AIX 7.1.

Portability problems not fixed by Gnulib: