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CMP0020
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Automatically link Qt executables to qtmain target on Windows.
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CMake 2.8.10 and lower required users of Qt to always specify a link
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dependency to the qtmain.lib static library manually on Windows.
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CMake 2.8.11 gained the ability to evaluate generator expressions
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while determining the link dependencies from IMPORTED targets. This
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allows CMake itself to automatically link executables which link to Qt
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to the qtmain.lib library when using IMPORTED Qt targets. For
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applications already linking to qtmain.lib, this should have little
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impact. For applications which supply their own alternative WinMain
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implementation and for applications which use the QAxServer library,
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this automatic linking will need to be disabled as per the
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documentation.
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The OLD behavior for this policy is not to link executables to
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qtmain.lib automatically when they link to the QtCore IMPORTED target.
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The NEW behavior for this policy is to link executables to qtmain.lib
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automatically when they link to QtCore IMPORTED target.
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This policy was introduced in CMake version 2.8.11. CMake version
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|release| warns when the policy is not set and uses OLD behavior. Use
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the cmake_policy command to set it to OLD or NEW explicitly.
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