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10.505 isfinite

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

Gnulib module: isfinite

Portability problems fixed by Gnulib:

• This macro is missing on some platforms: macOS 14, OpenBSD 6.7, AIX 5.1, Solaris 11.4.
• This macro incorrectly yields true for some ‘double’ and for some ‘long double’ arguments, on some platforms: Linux/ia64 (NaNs).

Portability problems not fixed by Gnulib:

• It is implementation-dependent whether isfinite raises an exception given a signaling NaN operand.
• This macro returns an unspecified result when given noncanonical values such as unnormalized numbers, pseudo-denormals, pseudo-NaNs, pseudo-Infinities, and pseudo-zeroes.