c++ - Qt Creator - Getting error D8021 - Invalid numeric argument '/Wextra' -

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i'm using qt creator make simple gui. functioning past couple weeks, i'm not sure changed i'll best detail be.

windows 10 qt creator 5.5

currently using following lines in .pro file, commenting them out makes no difference:

qmake_cxxflags += -std=c++14 -wall -wextra config += c++14

i guessing either has odd flag/exception, or compiler i'm using. in honesty, can't tell compiler i'm using, can tell in compiler options in settings, has 4 "microsoft visual c++ compiler 12.0"s under auto-detected.

i'm not sure here, appreciated.


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