Building without tests is not supported?

I’ve tried to build O2 with BUILD_TESTING and BUILD_TEST_ROOT_MACROS set to false and got this:

[cmake] CMake Error at Framework/Core/CMakeLists.txt:310 (set_property):
[cmake]   set_property given TEST names that do not exist:
[cmake] 
[cmake]     test_Framework_test_DanglingInputs
[cmake] 
[cmake] 
[cmake] 
[cmake] CMake Error at Framework/Core/CMakeLists.txt:313 (set_property):
[cmake]   set_property given TEST names that do not exist:
[cmake] 
[cmake]     test_Framework_test_BoostSerializedProcessing
[cmake] 
[cmake] 
[cmake] 
[cmake] CMake Error at Framework/GUISupport/CMakeLists.txt:50 (set_property):
[cmake]   set_property given TEST names that do not exist:
[cmake] 
[cmake]     test_Framework_test_SimpleTracksED
[cmake] 
[cmake] 
[cmake] 
[cmake] CMake Error at Framework/GUISupport/CMakeLists.txt:51 (set_property):
[cmake]   set_property given TEST names that do not exist:
[cmake] 
[cmake]     test_Framework_test_CustomGUIGL
[cmake] 
[cmake] 
[cmake] 
[cmake] CMake Error at Framework/GUISupport/CMakeLists.txt:52 (set_property):
[cmake]   set_property given TEST names that do not exist:
[cmake] 
[cmake]     test_Framework_test_CustomGUISokol