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

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"