[Buildroot] [PATCH] qt: build using old C++ standart

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

Hi Khem,

On Fri, 2016-08-19 at 10:21 -0700, Khem Raj wrote:
> > 
> > On Aug 19, 2016, at 9:18 AM, Vlad Zakharov <Vladislav.Zakharov@synopsys.com> wrote:
> > 
> > 'std::auto_ptr' is deprecated with gcc-6 but is used in qt4 code.
> > So we have to build using old C++ standart to prevent build failures.
> > 
> > qt4 is not being developed no more, so unfortunately we can't update
> > obsolete C++ code and have to add this workaround.
> > 
> > Fixes:
> > http://autobuild.buildroot.net/results/541/54172d55f39b2fcfa5b7fb4d4ee01566678babbc//
> > and also Qt build for ARC.
> > 
> > Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
> > ---
> > package/qt/qt.mk | 5 +++++
> > 1 file changed, 5 insertions(+)
> > 
> > diff --git a/package/qt/qt.mk b/package/qt/qt.mk
> > index 09b8dc2..41cdd1a 100644
> > --- a/package/qt/qt.mk
> > +++ b/package/qt/qt.mk
> > @@ -41,6 +41,11 @@ QT_CFLAGS = $(TARGET_CFLAGS)
> > QT_CXXFLAGS = $(TARGET_CXXFLAGS)
> > QT_LDFLAGS = $(TARGET_LDFLAGS)
> > 
> > +# Qt WebKit build fails when gcc-6 is used for build.
> > +# 'std::auto_ptr' is deprecated with gcc-6
> > +# So, we have to use old c++ standart to prevent build failure
> > +QT_CXXFLAGS += -std=gnu++98
> 
> you might add -Wno-deprecated as well.

Why would we need it if "-std=gnu++98" already fixes the build problem?

-Alexey