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This variable contains flags for the C compiler that enable extra optimizations. This comes from the QBUILD_CFLAGS_OPTMORE variable in qmake.conf. For optimizations that do not increase the code size, see MKSPEC.CFLAGS_OPTBASE. Note that you should assign the contents of this variable to QMAKE_CFLAGS_RELEASE for compatibility with qmake.

See also QBuild Variables and QBuild Script.

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Qt Extended - QBuild Maintainer Guide