This function fails to parse C99 hexadecimal floating point on some
platforms:
NetBSD 5.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1,
-Solaris 10, mingw.
+Solaris 11 2010-11, mingw.
@item
This function returns the wrong end pointer for @samp{0x1p} on some