4 POSIX specification: @url{http://www.opengroup.org/susv3xbd/math.h.html}
8 Portability problems fixed by Gnulib:
11 The macro @code{NAN} is not defined on some platforms:
12 OpenBSD 4.0, AIX 5.1, IRIX 6.5, OSF/1 5.1.
15 The macro @code{NAN} is not exposed outside of C99 compilation on some
20 The macros @code{NAN} and @code{HUGE_VAL} expand to a function address
21 rather than a floating point constant on some platforms:
25 Portability problems not fixed by Gnulib:
28 @code{NAN} is not a compile time constant with some compilers:
29 OSF/1 with Compaq (ex-DEC) C 6.4.