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POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html
Gnulib module: float
Portability problems fixed by Gnulib:
int to long double in incorrect on some
platforms:
glibc 2.7 on Linux/SPARC64.
LDBL_* macros are incorrect on some platforms:
On OpenBSD 4.0 and MirBSD 10, they are the same as the values of the
DBL_* macros, although ‘long double’ is a larger type than
‘double’.
On FreeBSD/x86 6.4, they represent the incorrect 53-bit precision assumptions
in the compiler, not the real 64-bit precision at runtime.
On Linux/PowerPC with GCC 4.4, on AIX 7.1 with GCC 4.2, and on IRIX 6.5,
they don’t reflect the “double double” representation of long double
correctly.
Portability problems not fixed by Gnulib:
FLT_ROUNDS is a constant expression and does not represent
the current rounding mode on some platforms:
glibc 2.11, HP-UX 11, mingw.