New CMake option OGS_DISABLE_LOGGING to do just that.

CMakeLists.txt

@@ -48,6 +48,9 @@ OPTION(OGS_BUILD_GUI "Should the Data Explorer be built?" OFF)
 
 OPTION(OGS_NO_EXTERNAL_LIBS "Builds OGS without any external dependencies." OFF)
 
+# Logging
+OPTION(OGS_DISABLE_LOGGING "Disables all logog messages." OFF)
+
 # Print CMake variable values
 IF (OGS_CMAKE_DEBUG)
 	INCLUDE(ListAllCMakeVariableValues)

scripts/cmake/ProjectSetup.cmake

@@ -3,6 +3,10 @@ SET( EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin )
 SET( LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib )
 
 # Logging level
+IF(OGS_DISABLE_LOGGING)
+	SET(OGS_LOG_LEVEL LOGOG_LEVEL_NONE)
+ENDIF()
+
 IF(NOT DEFINED OGS_LOG_LEVEL)
 	IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
 		ADD_DEFINITIONS(-DLOGOG_LEVEL=LOGOG_LEVEL_DEBUG)