strerror
========

POSIX specification:
 http://www.opengroup.org/onlinepubs/9699919799/functions/strerror.html

Gnulib module: strerror

Portability problems fixed by Gnulib:

  * This function does not support the error values that are specified by POSIX but not defined by the system, on some platforms: OpenBSD 4.0, OSF/1 5.1, NonStop Kernel, Cygwin 1.5.x, mingw.

  * This function reports failure for strerror(0) (by setting errno or using a string similar to out-of-range values), although POSIX requires this to leave errno unchanged and report success, on some platforms: FreeBSD 8.2, MacOS X 10.5.

  * This function fails to return a string for out-of-range integers on some platforms: HP-UX 11, IRIX 6.5, Solaris 8. (Some return NULL which is a POSIX violation, others return the empty string which is valid but not as useful); this can still cause bugs because most programs call strerror without setting and testing errno.)

Portability problems not fixed by Gnulib: