cmake: Cannot use multiple qt builds in the same project

I compile a series of Qts so that each one is in a separate directory:

qt5-x64-shared-debug
qt5-x64-shared-release
qt5-x64-static-debug
qt5-x64-static-release
qt5-x86-shared-debug
qt5-x86-shared-release
qt5-x86-static-debug
qt5-x86-static-release

this way I can point from my cmake build system to the respective flavor of qt5 i want. Note that each version may or may not include some features. For instance I don't compile Designer for debug builds. This also means that my directories may not have all modules or populated with the same headers etc. That is the reason I have 1 directory per configuration, plus it is much cleaner than putting it altogether in my opinion, despite consuming a bit more space.

The problem is that support of cmake in Qt5 assumes either release or debug or both installed in the same place. The way Qt5::XXX targets are setup do not offer the possibility to have multiple qts used in the same project as it would be in my case. I currently don't use Qt's own cmake scripts because I cannot do something like this:

CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)

project(use-multiple-qt-builds)

SET(__QT5_ROOT "D:/dev/qt5-5.2.0-vs2012/qt5-x64-shared-debug")

FIND_PACKAGE(	Qt5Core REQUIRED
		PATHS "${__QT5_ROOT}" 
		NO_DEFAULT_PATH
)

get_target_property(QtCore_location Qt5::Core LOCATION)
MESSAGE("Debug Qt5: ${QtCore_location}")


SET(__QT5_ROOT "D:/dev/qt5-5.2.0-vs2012/qt5-x64-shared-release")

FIND_PACKAGE(	Qt5Core REQUIRED
		PATHS "${__QT5_ROOT}" 
		NO_DEFAULT_PATH
)

get_target_property(QtCore_location Qt5::Core LOCATION)
MESSAGE("Release Qt5: ${QtCore_location}")

I am proposing that Qt5 targets are setup with another namespace level referring to their configuration, for instance:

Qt5::Core::release and Qt5::Core::debug

or they are seperated with the "d" suffix from their release counter parts:

Qt5::Core and Qt5::Cored

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