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* m4/log2-ieee.m4: New file. * m4/log2.m4 (gl_FUNC_LOG2): If gl_FUNC_LOG2_IEEE is present, test whether log2 works with a minus zero argument. Replace it if not. * modules/log2-ieee (Files): Add m4/log2-ieee.m4. (configure.ac): Invoke gl_FUNC_LOG2_IEEE. * doc/posix-functions/log2.texi: Mention the log2-ieee module.
39 lines
1.0 KiB
Plaintext
39 lines
1.0 KiB
Plaintext
@node log2
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@section @code{log2}
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@findex log2
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log2.html}
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Gnulib module: log2 or log2-ieee
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Portability problems fixed by either Gnulib module @code{log2} or @code{log2-ieee}:
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@itemize
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@item
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This function is missing on some platforms:
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FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, older IRIX 6.5,
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Solaris 9, MSVC 9, Interix 3.5.
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@item
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This function is not declared on some platforms:
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IRIX 6.5.
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@item
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This function is only provided as a macro on some platforms:
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Cygwin 1.5.x.
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@item
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This function returns a wrong value for a minus zero argument on some platforms:
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OSF/1 5.1.
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@item
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This function returns slightly wrong values for exact powers of 2 on some platforms:
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Cygwin 1.7.9.
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@end itemize
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Portability problems fixed by Gnulib module @code{log2-ieee}:
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@itemize
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@item
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This function returns a wrong value for a negative argument on some platforms:
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NetBSD 5.1, Solaris 11 2011-11.
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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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@end itemize
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