cmake/modules/KstPchSupport.cmake

@@ -60,7 +60,11 @@ macro(kst_add_pch_rule  _header _sources _lib_type)
 			list(APPEND _args ${CMAKE_SHARED_LIBRARY_CXX_FLAGS})
 		endif()
 		if(_definitions_type)
-			list(APPEND _args -D${_definitions_type})
+			if(CMAKE_MAJOR_VERSION LESS 3)
+				list(APPEND _args "-D${_definitions_type}")
+			else()
+				list(APPEND _args "$<$<BOOL:${_definitions_type}>:-D${_definitions_type}>")
+			endif()
 		endif()
 		#message(STATUS "pch: ${_args}")