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[Solved] QMake and optimization flags for compiler

  • I'm using Qt Creator and find out that in default, g++ will use -O2 for compiling phase and -O1 for linking phase. I have add -O3 to both QMAKE_CXXFLAGS and LIBS but end up with there both -O3 -O2 in compiling phase and -O1 -O3 in linking phase. Is there a way to control the optimization flags in .pro files?

  • @

    Make sure you've re-run qmake after modifying your .pro file.

  • Oh. I never thought of "-=" operator. Thank you very much.

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