ilogb
=====

POSIX specification:
 http://www.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, IRIX 5.3, MSVC 9.

  * This function returns a wrong result for a zero argument on some platforms: OpenBSD 4.9, AIX 5.1.

  * This function returns a wrong result for an infinite argument on some platforms: NetBSD 5.1, OpenBSD 4.9.

  * This function returns a wrong result for a NaN argument on some platforms: OpenBSD 4.9.

Portability problems not fixed by Gnulib: