Project file:
CONFIG -= qt
QMAKE_CXXFLAGS += -std=c++98
QMAKE_CXXFLAGS -= -std=c++11
QMAKE_CXXFLAGS -= -std=gnu++11
CONFIG -= c++11
Result:
g++ -c -pipe -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-unused-but-set-variable -Wno-reorder -Wno-missing-field-initializers -std=c++98 -DDEBUG -g -std=gnu++11 -Wall -W -fPIC -DQT_QML_DEBUG -I../../qqq -I. -I../src/jsoncpp -I../lib -I../../../../Qt/5.9.1/gcc_64/mkspecs/linux-g++ -o ../build/debug/obj/TaskManager.o ../src/TaskManager.cpp
g++ -c -pipe -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-unused-but-set-variable -Wno-reorder -Wno-missing-field-initializers -std=c++98 -DDEBUG -g -std=gnu++11 -Wall -W -fPIC -DQT_QML_DEBUG -I../../qqq -I. -I../src/jsoncpp -I../lib -I../../../../Qt/5.9.1/gcc_64/mkspecs/linux-g++ -o ../build/debug/obj/Utils.o ../src/Utils.cpp
As you can see, the option -std=gnu++11still exists (no reaction to "QMAKE_CXXFLAGS -="/ "CONFIG -=").
Qt:
Qt Creator 4.3.1
Based on Qt 5.9.1 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)
Built on Jun 29 2017 04:10:39
Thank you very much.
PS I have compatibility issues with gnu ++ 11 (C ++ with gcc extenstions) on a clean system
./qqq: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by ./qqq)
./qqq: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by ./qqq)
./qqq: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.21' not found
and want to use C ++ 11 (C ++ without gcc extenstions) instead of gnu ++ 11 without any extensions, but I cannot disable it: - (
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