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According to Bruno Haible on 2/24/2007 7:08 PM:
> Cygwin: isnan() is a function, defined in cygwin.dll
No, on cygwin, isnan is a macro in <math.h> that wraps the internal
functions __isnan{,lf}, and the isnan entry point in cygwin1.dll exists
only for backwards compatibility for multi-year-old apps that were
compiled against cygwin prior to the POSIX compliance bug being fixed of
providing isnan only as a macro. And you still didn't catch my point that
on cygwin, you don't need -lm to get isnan() to work, whether or not it is
an exported function, since modern code should not be linking against the
entry point isnan on cygwin anyways. Checking AC_CHECK_FUNC([isnan]) is
wrong since POSIX does not guarantee that isnan is a function; instead,
you must check whether including <math.h> and using isnan() will link
correctly in the absence of -lm.
- --
Don't work too hard, make some time for fun as well!
Eric Blake [EMAIL PROTECTED]
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