[Bug c/11051] -Wno-deprecated needed also for C

[manu at gcc dot gnu dot org]

------- Comment #9 from manu at gcc dot gnu dot org  2007-01-27 01:02 -------
(In reply to comment #8)
> Subject: Re:  -Wno-deprecated needed also for C
> 
> > manu at gcc dot gnu dot org wrote:
> > > ------- Comment #4 from manu at gcc dot gnu dot org  2007-01-23 00:01 -------
> > > The testcase given is not valid any more. Could you think in any other
> > > testcase?
> > > 
> > > In stmt.c (expand_asm_operands) there is:
> > > 
> > >             warning (0, "use of memory input without lvalue in "
> > >                        "asm operand %d is deprecated", i + noutputs);
> > > 
> > > 
> > 
> > Hang on, hang on...
> > 
> > WTF?!  Using an rvalue in an assembly input that may contain "m" is 
> > something that is highly useful, and it will break metric tons of code. 
> >   -Wno-deprecated or no -Wno-deprecated, deprecating this particular 
> > construct is a major mistake.
> 
> This has been true since 3.3.3 and in fact, this was made an error in 4.0.0,
> even though the warning remains.  

Huh? What is that suppose to mean? 

> So:
> float f(float a)
> {
>   asm(""::"mo"((double)a));
>   return a;
> }
> 
> Fails

But it doesn't produce that warning. Is that warning dead code or what?

Still, going back to this PR, is there anything deprecated in C front-end worth
of implementing -Wno-deprecated for C?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11051