On Fri, Aug 19, 2011 at 1:35 PM, <paul_kon...@dell.com> wrote:
> I think the point is that the effect of -Wmissing-prototypes is always
> enabled in C++, so that switch is rejected. The solution would seem to be to
> remove that switch from the command line if C++ is used to build; that will
> produce the intended result.
G++ doesn't give a warning at all:
[hjl@gnu-33 gcc]$ cat x.c
int
foo (int x)
{
return x;
}
[hjl@gnu-33 gcc]$ ./g++ -B./ -Wall -S -O x.c
[hjl@gnu-33 gcc]$
> paul
>
> -----Original Message-----
> From: gcc-ow...@gcc.gnu.org [mailto:gcc-ow...@gcc.gnu.org] On Behalf Of H.J.
> Lu
> Sent: Friday, August 19, 2011 3:34 PM
> To: Joe Buck
> Cc: GCC Development
> Subject: Re: Bootstrap with -Wmissing-prototypes doesn't work for C++
>
> [hjl@gnu-33 gcc]$ cat x.c
> int
> foo (int x)
> {
> return x;
> }
> [hjl@gnu-33 gcc]$ ./xgcc -B./ -S -O -Wmissing-prototypes x.c
> x.c:2:1: warning: no previous prototype for 'foo' [-Wmissing-prototypes]
> [hjl@gnu-33 gcc]$ ./g++ -B./ -S -O -Wmissing-prototypes x.c
> cc1plus: warning: command line option '-Wmissing-prototypes' is valid for
> Ada/AdaWhy/C/ObjC but not for C++ [enabled by default]
> [hjl@gnu-33 gcc]$ ./g++ -B./ -S -O x.c
> [hjl@gnu-33 gcc]$
>
> Is this a bug?
>
> On Fri, Aug 19, 2011 at 12:24 PM, Joe Buck <joe.b...@synopsys.com> wrote:
>> I'm confused. Since C++ treats the lack of a prototype as a hard error, what
>> does it mean to make -Wmissing-prototypes useless?
>>
>> ________________________________________
>> From: gcc-ow...@gcc.gnu.org [gcc-ow...@gcc.gnu.org] On Behalf Of H.J.
>> Lu [hjl.to...@gmail.com]
>> Sent: Friday, August 19, 2011 9:36 AM
>> To: GCC Development
>> Subject: Bootstrap with -Wmissing-prototypes doesn't work for C++
>>
>> Since -Wmissing-prototypes doesn't work for C++, using
>> C++ to bootstrap GCC makes -Wmissing-prototypes useless.
>> You will see the -Wmissing-prototypes message in stage 1, but you
>> won't see it in stage3 2/3.
>>
>> --
>> H.J.
>
>
>
> --
> H.J.
>
--
H.J.
