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* m4/log-ieee.m4: New file. * m4/log.m4 (gl_FUNC_LOG): If gl_FUNC_LOG_IEEE is present, test whether log works with a negative argument. Replace it if not. * lib/log.c (log): For negative arguments, return NaN. * modules/log-ieee (Files): Add m4/log-ieee.m4. (configure.ac): Invoke gl_FUNC_LOG_IEEE. * doc/posix-functions/log.texi: Mention the log-ieee module.
26 lines
639 B
Plaintext
26 lines
639 B
Plaintext
@node log
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@section @code{log}
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@findex log
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log.html}
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Gnulib module: log or log-ieee
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Portability problems fixed by either Gnulib module @code{log} or @code{log-ieee}:
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@itemize
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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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@end itemize
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Portability problems fixed by Gnulib module @code{log-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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