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b5cc9885b4
* m4/modf-ieee.m4: New file. * m4/modf.m4 (gl_FUNC_MODF): If gl_FUNC_MODF_IEEE is present, test whether modf works with NaN and Inf. Replace it if not. * lib/math.in.h (modf): New declaration. * lib/modf.c: New file. * m4/math_h.m4 (gl_MATH_H): Test whether modf is declared. (gl_MATH_H_DEFAULTS): Initialize GNULIB_MODF, REPLACE_MODF. * modules/math (Makefile.am): Substitute GNULIB_MODF, REPLACE_MODF. * modules/modf (Files): Add lib/modf.c. (Depends-on): Add math, isfinite, trunc, isinf. (configure.ac): Addrange to compile lib/modf.c if needed. * modules/modf-ieee (Files): Add m4/modf-ieee.m4, m4/minus-zero.m4, m4/signbit.m4. (configure.ac): Invoke gl_FUNC_MODF_IEEE. * tests/test-math-c++.cc: Check the declaration of modf. * doc/posix-functions/modf.texi: Mention the modf-ieee module.
26 lines
648 B
Plaintext
26 lines
648 B
Plaintext
@node modf
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@section @code{modf}
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@findex modf
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/modf.html}
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Gnulib module: modf or modf-ieee
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Portability problems fixed by either Gnulib module @code{modf} or @code{modf-ieee}:
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@itemize
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@end itemize
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Portability problems fixed by Gnulib module @code{modf-ieee}:
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@itemize
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@item
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This function has problems with a NaN argument on some platforms:
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NetBSD 5.1, Cygwin.
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@item
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This function has problems with infinite arguments on some platforms:
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FreeBSD 6.4, OpenBSD 4.9, IRIX 6.5, OSF/1 5.1.
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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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