qt - How to suppress warnings for file included from header

Question

I use GCC -Weffc++ option in my Qt project. To suppress warnings from Qt headers i add QMAKE_CXXFLAGS += -isystem $(QTDIR)include.
But this doesn't suppress all warnings, i still get annoying warnings from QUuid class because $(QTDIR)includeQtCorequuid.h
file includes
....srccorelibpluginquuid.h.
I tried to add
QMAKE_CXXFLAGS += -isystem $(QTDIR)src
and
QMAKE_CXXFLAGS += -isystem $(QTDIR)srccorelibplugin
but it didn't help. Is there a way to fix this?

Answer 1

You need to suppress each directory separately. Example from my project:

QMAKE_CXXFLAGS += -isystem "$$[QT_INSTALL_HEADERS]/qt5" -isystem "$$[QT_INSTALL_HEADERS]/qt5/QtWidgets" 
                  -isystem "$$[QT_INSTALL_HEADERS]/QtXml" -isystem "/usr/include/qt5/QtGui" 
                  -isystem "$$[QT_INSTALL_HEADERS]/QtCore"

Or, to automate the above for the exact Qt modules you have enabled:

for (inc, QT) {
    QMAKE_CXXFLAGS += -isystem "$$[QT_INSTALL_HEADERS]/Qt$$system("echo $$inc | sed 's/.*/u&/'")"
}

# Still need this separately:
QMAKE_CXXFLAGS += -isystem "$$[QT_INSTALL_HEADERS]/qt5"