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9fb732a430
* lib/math.in.h (hypot): New declaration. * lib/hypot.c: New file. * m4/hypot-ieee.m4: New file. * m4/hypot.m4 (gl_FUNC_HYPOT): If gl_FUNC_HYPOT_IEEE is present, test whether hypot works with mixed NaN and Infinity arguments. Replace it if not. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize GNULIB_HYPOT, REPLACE_HYPOT. * modules/math (Makefile.am): Substitute GNULIB_HYPOT, REPLACE_HYPOT. * modules/hypot (Files): Add lib/hypot.c. (Depends-on): Add dependencies. (configure.ac): Arrange to compile replacement if REPLACE_HYPOT is 1. * modules/hypot-ieee (Files): Add m4/hypot-ieee.m4. (configure.ac): Invoke gl_FUNC_HYPOT_IEEE. * tests/test-math-c++.cc: Check the declaration of hypot. * doc/posix-functions/hypot.texi: Mention the hypot-ieee module.
24 lines
576 B
Plaintext
24 lines
576 B
Plaintext
@node hypot
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@section @code{hypot}
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@findex hypot
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/hypot.html}
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Gnulib module: hypot or hypot-ieee
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Portability problems fixed by either Gnulib module @code{hypot} or @code{hypot-ieee}:
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@itemize
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@end itemize
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Portability problems fixed by Gnulib module @code{hypot-ieee}:
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@itemize
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@item
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When the arguments are mixed NaN and Infinity, this function returns a wrong
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value on some platforms:
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OSF/1 5.1, mingw, MSVC 9.
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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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