Re: C++: Math function round() does not compile - why?
On Tue, 2006-02-14 at 14:11 +0100, Jan C. Nordholz wrote:
> Hi Oliver,
>
> > g++-2.95 -c -pipe -DQWS -fexceptions -fno-rtti -Wall -W -g -std=c99 -I/opt/Qtopia/include -o orderimpl.o orderimpl.cpp
> > orderimpl.cpp: In method `void OrderImpl::calculate_line(int)':
> > orderimpl.cpp:84: implicit declaration of function `int round(...)'
>
> this sounds like <math.h> doesn't give you the prototype for round().
> Try to run <math.h> through the preprocessor alone
> (g++-2.95 -std=c99 -E /usr/include/math.h), and grep for "round".
> I don't get the definition with "g++-3.3" alone, but with
> "g++-3.3 -std=c99" I do... YMMV. I've got no g++-2.95 here to continue
> the tests.
with g++-2.95, this gives no prototypes for round().
So it appears that -std=c99 does not work. Is there some way to achieve
this for 2.95? (This is now academic, since I have written my own
version for this application.)
--
Oliver Elphick olly@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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