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10.480 ilogb

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

Gnulib module: ilogb

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, MSVC 9.
• This function returns a wrong result for a zero argument on some platforms: OpenBSD 6.7, AIX 5.1.
• This function returns a wrong result for denormalized arguments on some platforms: Mac OS X 10.5 64-bit, AIX 7.1 64-bit.
• This function returns a wrong result for an infinite argument on some platforms: NetBSD 7.1, OpenBSD 6.7.
• This function returns a wrong result for a NaN argument on some platforms: NetBSD 7.1, OpenBSD 6.7.

Portability problems not fixed by Gnulib: