[oe] nativesdk-qtbase 5.9.2 C++11 errors with gcc 6.3?

[Patrick Ohly]

On Tue, 2017-10-03 at 19:45 -0400, Denys Dmytriyenko wrote:
> Martin, Khem,
> 
> Have you tried building Qt 5.9 with gcc 6.3 from oe-core? I'm seeing
> bunch of 
> what seems to be C++11 related errors during do_configure of
> nativesdk-qtbase. 
> Target qtbase builds fine and switching to gcc 7.2 seems to resolve
> it as well.
> 
> Any ideas or pointers? Thanks!
> 
> 
> Errors are like these:
> 
> In file included from
> ../include/QtCore/5.9.2/QtCore/private/qnumeric_p.h:1:0,
>                  from /OE/master/build/tmp-glibc/work/x86_64-
> nativesdk-oe-linux/nativesdk-qtbase/5.9.2+gitAUTOINC+73573fce29-
> r0/git/src/corelib/tools/qarraydata.cpp:42:
> ../include/QtCore/5.9.2/QtCore/private/../../../../../../git/src/core
> lib/global/qnumeric_p.h: In function 'bool
> qnumeric_std_wrapper::__builtin_isnan(double)':
> ../include/QtCore/5.9.2/QtCore/private/../../../../../../git/src/core
> lib/global/qnumeric_p.h:104:45: error: '__builtin_isnan' is not a
> member of 'std'
>  static inline bool isnan(double d) { return std::isnan(d); }

I'm getting the same error when building qemu 2.8.0 for intel-corei7-64 
with gcc 6.3.0.

The reason seems to be that somewhere there's a
  #define isnan __builtin_isnan
which doesn't work in C++ because std::__builtin_isnan    does not
exist.

I'm still looking for the define... if someone has suggestions, I'm all
ears.

-- 
Best Regards, Patrick Ohly

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