ilogbl
======

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

Gnulib module: ilogbl

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: FreeBSD 5.2.1, NetBSD 7.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, Cygwin 1.7.x, MSVC 9.

  * This function returns a wrong result for a zero argument on some platforms: Cygwin 2.9.

  * This function returns a wrong result for a NaN argument on some platforms: Cygwin 3.4.6.

  * This function returns a wrong result for denormalized arguments on some platforms: AIX 7.1 64-bit, Haiku 2017.

Portability problems not fixed by Gnulib: