Re: [Qemu-devel] [PATCH] pixman: remove -Wredundand-decls

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 04/16/2013 07:22 PM, Paolo Bonzini wrote:
> Il 16/04/2013 09:57, Markus Armbruster ha scritto:
>>>
>>> I think this is just beautiful. Fedora18, x86_64, NO cross
>>> compiler. gcc does not apply -Wredundant-decls to /usr/include/* but
>>> does it for all other headers and in the case of cross compilation I
>>> hit this case.
>
> '-Wsystem-headers'
>       Print warning messages for constructs found in system header files.
>       Warnings from system headers are normally suppressed, on the
>       assumption that they usually do not indicate real problems and
>       would only make the compiler output harder to read.
>
>>> Does anyone know the way to tell gcc that libc headers are not at
>>> /usr/include but somewhere else?
>
> I think this helps:
>
> '--sysroot=DIR'
>       Use DIR as the logical root directory for headers and libraries.
>       For example, if the compiler normally searches for headers in
>       '/usr/include' and libraries in '/usr/lib', it instead searches
>       'DIR/usr/include' and 'DIR/usr/lib'.
>
> but you shouldn't need it.  Just configure your GCC with
> --with-sysroot=/foo and it should just work.


--sysroot helps for native compiler but does not for the cross compiler.

Anyway, I tried Markus's patch, now assert.h generates just warnings which 
I can successfully suppress. Cool, thanks everyone :)



-- 
Alexey