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* doc/posix-headers/float.texi: Mention problem with FLT_ROUNDS. * doc/posix-headers/math.texi: Mention problem with math_errhandling.
33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
@node float.h
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@section @file{float.h}
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/basedefs/float.h.html}
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Gnulib module: float
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Portability problems fixed by Gnulib:
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@itemize
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@item
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The conversion from @code{int} to @code{long double} in incorrect on some
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platforms:
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glibc 2.7 on Linux/SPARC64.
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@item
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The values of @code{LDBL_*} macros are incorrect on some platforms:
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On OpenBSD 4.0, MirBSD 10, and BeOS, they are the same as the values of the
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@code{DBL_*} macros, although @samp{long double} is a larger type than
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@samp{double}.
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On FreeBSD/x86 6.4, they represent the incorrect 53-bit precision assumptions
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in the compiler, not the real 64-bit precision at runtime.
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On Linux/PowerPC with GCC 4.4, on AIX 7.1 with GCC 4.2, and on IRIX 6.5,
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they don't reflect the ``double double'' representation of @code{long double}
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correctly.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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The macro @code{FLT_ROUNDS} is a constant expression and does not represent
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the current rounding mode on some platforms:
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glibc 2.11, HP-UX 11, mingw.
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@end itemize
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