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Re: why does g++ not warn about division by zero?
Hello,
yes, i have tried -O , -O1 , -O2, -O3 and no warning is raised by g++.
Best regards
Martin
-------- Original-Nachricht --------
> Datum: Sun, 21 Jun 2009 08:34:50 -0400
> Von: John Fine <johnsfine@verizon.net>
> An: Martin Ettl <ettl.martin@gmx.de>
> CC: gcc-help@gcc.gnu.org
> Betreff: Re: why does g++ not warn about division by zero?
> Have you tried that at various optimization levels?
>
> At lower optimization levels, the "inline" keyword should not cause the
> function to actually get inlined.
>
> If the function is not actually inlined, gcc cannot be aware of the
> divide by zero.
>
> I don't happen to know whether gcc would warn if it were aware of the
> divide by zero, nor if actually inlining is sufficient to make it
> aware. I'm just saying actually inlining should be necessary to make it
> aware of the divide by zero.
>
> Martin Ettl wrote:
> > template <typename T1, typename T2> inline T1 foo (T1 const& a, T2
> const& b)
> > {
> > // ....
> > return a/b;
> > }
> >
> > int main()
> > {
> > std::cout << foo(4.,0) << std::endl;
> > return 0;
> > }
> >
> > I compiled the testprogramm with following command:
> > g++ -W -Wall -pedantic -o test test.cpp
> >
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