Utiliser le générateur Ninja sous Windows. Avec Visual Studio, les MOC vont se re-générer à chaque fois et donc tous les binaires seront systématiquement recompilés :

[build]   1>Checking Build System
[build]   Automatic MOC and UIC for target VtkTest
[build]   VtkTest.vcxproj -> ...\VtkTest.exe
[build]   Building Custom Rule ../CMakeLists.txt
[build]   Automatic MOC and UIC for target lib1
[build]   lib1.vcxproj -> ...\lib1.dll
[build]   Automatic MOC and UIC for target lib2
[build]   lib2.vcxproj -> ...\lib2.dll
[build]   Automatic MOC and UIC for target exec
[build]   1>Automatic RCC for .qrc
[build]   Building Custom Rule .../CMakeLists.txt