[OE-core] [RFC PATCH 1/4] qt4: fix compile error in Qt 4.8.0 with gcc 4.6

[Paul Eggleton]

On Thursday 09 February 2012 13:19:22 Khem Raj wrote:
> since there is a namespace conflict that should be fixed IMO removing
> Wrror is not quite the right thing to do here IMO.

So removing -Werror is somewhat heavy-handed, yes; perhaps we can simply
add -Wno-error=c++0x-compat and mark this patch as inappropriate for
upstreaming instead?

> Its a workaround but probably upstream wont
> accept it. So change nullptr here to something like qt_nullptr in source
> tree

What the code is attempting to do is provide its own "nullptr" if it isn't
being provided as part of the language:

------------------------------
#if __has_feature(cxx_nullptr) || (GCC_VERSION_AT_LEAST(4, 6, 0) && defined(__GXX_EXPERIMENTAL_CXX0X__)) || (defined(_MSC_VER) && _MSC_VER >= 1600 && !COMPILER(INTEL))

#define HAVE_NULLPTR 1

#else

namespace std {
    class nullptr_t { };
}

extern std::nullptr_t nullptr;

#endif
------------------------------

gcc 4.6 is preempting this and complaining about the use of the identifier. I
don't think renaming it is going to be acceptable upstream either.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre