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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)\include\QtCore\quuid.h
file includes..\..\src\corelib\plugin\quuid.h.
I tried to addQMAKE_CXXFLAGS += -isystem $(QTDIR)\src
andQMAKE_CXXFLAGS += -isystem $(QTDIR)\src\corelib\plugin
but it didn't help. Is there a way to fix this?
625
asked Jul 26 '12 06:07
To disable a set of warnings for a given piece of code, you have to start with a “push” pre-processor instruction, then with a disabling instruction for each of the warning you want to suppress, and finish with a “pop” pre-processor instruction.
-w is the GCC-wide option to disable warning messages.
To answer your question about disabling specific warnings in GCC, you can enable specific warnings in GCC with -Wxxxx and disable them with -Wno-xxxx. From the GCC Warning Options: You can request many specific warnings with options beginning -W , for example -Wimplicit to request warnings on implicit declarations.
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"
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