clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

[Sedat Dilek]

Hi,

I am playing with llvm/clang v3.2 and mesa.

It's annoying to see these hundreds of warnings...

    clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

NOTE: '-fno-builtin-memcmp' is a gcc-specific compiler-flag.

I have done here a brutal solution, maybe someone else has a more elegant one.

Thanks.

Regards,
- Sedat -

Re: clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

[Sedat Dilek]

On Fri, Jan 18, 2013 at 5:19 AM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> Hi,
>
> I am playing with llvm/clang v3.2 and mesa.
>
> It's annoying to see these hundreds of warnings...
>
>     clang: warning: argument unused during compilation: '-fno-builtin-memcmp'
>
> NOTE: '-fno-builtin-memcmp' is a gcc-specific compiler-flag.
>
> I have done here a brutal solution, maybe someone else has a more elegant one.
>
> Thanks.
>

[ CCing LLVMLinux ]

OK, there exists smarter solutions like this...

### Export compiler settings (here: clang)
export CC=clang
export CXX=clang++
export CFLAGS="-Qunused-arguments"
export CXXFLAGS="$CFLAGS"

...but we do not live only in a GCC world :-).
I would like to see a fix in mesa (XORG) world.

- Sedat -


> Regards,
> - Sedat -

Re: clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

[Matt Turner]

On Thu, Jan 17, 2013 at 8:19 PM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> Hi,
>
> I am playing with llvm/clang v3.2 and mesa.
>
> It's annoying to see these hundreds of warnings...
>
>     clang: warning: argument unused during compilation: '-fno-builtin-memcmp'
>
> NOTE: '-fno-builtin-memcmp' is a gcc-specific compiler-flag.
>
> I have done here a brutal solution, maybe someone else has a more elegant one.
>
> Thanks.
>
> Regards,
> - Sedat -

> mesa3d-dev@lists.sourceforge.net

Please send to mesa-dev@lists.freedesktop.org and not the sourceforge list.

-fno-builtin-memcmp is added to CFLAGS inside a block that checks if
the compiler is gcc:

dnl Add flags for gcc and g++
if test "x$GCC" = xyes; then
    ...
    CFLAGS_FOR_BUILD="$CFLAGS_FOR_BUILD -fno-builtin-memcmp"
    CFLAGS="$CFLAGS -fno-builtin-memcmp"
    ...
fi

Re: clang: warning: argument unused during compilation: '-fno-builtin-memcmp'

[Sedat Dilek]

On Fri, Jan 18, 2013 at 6:25 PM, Matt Turner <mattst88@gmail.com> wrote:
> On Thu, Jan 17, 2013 at 8:19 PM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>> Hi,
>>
>> I am playing with llvm/clang v3.2 and mesa.
>>
>> It's annoying to see these hundreds of warnings...
>>
>>     clang: warning: argument unused during compilation: '-fno-builtin-memcmp'
>>
>> NOTE: '-fno-builtin-memcmp' is a gcc-specific compiler-flag.
>>
>> I have done here a brutal solution, maybe someone else has a more elegant one.
>>
>> Thanks.
>>
>> Regards,
>> - Sedat -
>
>> mesa3d-dev@lists.sourceforge.net
>
> Please send to mesa-dev@lists.freedesktop.org and not the sourceforge list.
>
> -fno-builtin-memcmp is added to CFLAGS inside a block that checks if
> the compiler is gcc:
>
> dnl Add flags for gcc and g++
> if test "x$GCC" = xyes; then
>     ...
>     CFLAGS_FOR_BUILD="$CFLAGS_FOR_BUILD -fno-builtin-memcmp"
>     CFLAGS="$CFLAGS -fno-builtin-memcmp"
>     ...
> fi

YUPP, I had a look at configure.ac and other files.
For clang -fno-builtin-memcmp is added to compiler-flags anyway and
flooded my build-log.
Dunno, how to fix it...

- Sedat -