7.12 float.h

POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html

Gnulib module: float

Portability problems fixed by Gnulib:

• The values of LDBL_* macros are incorrect on some platforms: On OpenBSD 4.0, MirBSD 10, and BeOS, they are the same as the values of the DBL_* macros, although ‘long double’ is a larger type than ‘double’.

Portability problems not fixed by Gnulib: