Qt 5.7.0 qtwayland build error with gcc6

[Paul H.]

I am trying to build 5.7.0 in linux with gcc 6.1.0. The module qtwayland is failing. If I skip this module, everything else builds. There are multiple errors about something "not being declared in this scope". Here is the first error:

In file included from /home/paul/mnt/sources/build-qt/qtbase/include/QtCore/qglobal.h:1:0,
                 from ../../include/QtWaylandCompositor/../../../../../../src_mnt/sources/qt5/qtwayland/src/compositor/global/qwaylandexport.h:40,
                 from ../../include/QtWaylandCompositor/qwaylandexport.h:1,
                 from ../../include/QtWaylandCompositor/../../../../../../src_mnt/sources/qt5/qtwayland/src/compositor/global/qwaylandcompositorextension.h:40,
                 from ../../include/QtWaylandCompositor/qwaylandcompositorextension.h:1,
                 from ../../include/QtWaylandCompositor/QWaylandCompositorExtension:1,
                 from /home/paul/src_mnt/sources/qt5/qtwayland/src/compositor/extensions/qwaylandtextinput.h:40,
                 from /home/paul/src_mnt/sources/qt5/qtwayland/src/compositor/extensions/qwaylandtextinput.cpp:37:
/home/paul/src_mnt/sources/qt5/qtwayland/src/compositor/extensions/qwaylandtextinput.cpp: In member function 'void QWaylandTextInputPrivate::sendKeyEvent(QKeyEvent*)':
/home/paul/src_mnt/sources/qt5/qtwayland/src/compositor/extensions/qwaylandtextinput.cpp:218:35: error: 'QWaylandXkb' was not declared in this scope
     foreach (xkb_keysym_t keysym, QWaylandXkb::toKeysym(event)) {

Here are my build commands:

export CXXFLAGS=-fno-delete-null-pointer-checks &&

<path_to_git_source>/configure -prefix         /opt/qt5 \
            -sysconfdir     /etc/xdg   \
            -confirm-license           \
            -opensource                \
            -dbus-linked               \
            -openssl-linked            \
            -system-harfbuzz           \
            -system-sqlite             \
            -nomake examples           \
            -no-rpath                  \
            -optimized-qmake           \
            -skip qtwebengine          &&
make

Any ideas on how to fix?

[Paul H.]

Ok, I got this figured out. I thought it might be an issue with gcc6, so I tried on a different system with gcc5, which was successful. I compared the config.summary files from the 2 builds and saw that the unsuccessful build was attempting to use a bundled version of libxkbcommon. I installed libxkbcommon-0.6.1 on the gcc6 system and re-built. This time it was successful.

Paul

[frust]

@Paul-H. i got the same error , and installed libxkbcommon-0.6.1,but the same error is also ~
these days , i compiled qt5 for a lot time , but eventuily disappointed~