Next: fmtmsg.h, Previous: fenv.h, Up: ISO C and POSIX Header File Substitutes [Contents][Index]
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, and on AIX 7.1 with GCC 4.2,
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.