Improve build logging.

CMake/CarlaDependencies.cmake

@@ -14,7 +14,7 @@ set (CARLA_DEPENDENCIES_PENDING)
 
 macro (carla_dependency_add NAME TAG ARCHIVE_URL GIT_URL)
   if (PREFER_CLONE)
-    message ("Cloning ${NAME}...")
+    carla_message ("Cloning ${NAME}...")
     FetchContent_Declare(
       ${NAME}
       GIT_REPOSITORY ${GIT_URL}
@@ -27,7 +27,7 @@ macro (carla_dependency_add NAME TAG ARCHIVE_URL GIT_URL)
     )
     list (APPEND CARLA_DEPENDENCIES_PENDING ${NAME})
   else ()
-    message ("Downloading ${NAME}...")
+    carla_message ("Downloading ${NAME}...")
     FetchContent_Declare(
       ${NAME}
       URL ${ARCHIVE_URL}

CMake/LinuxToolchain.cmake

@@ -20,9 +20,7 @@ if ("${UE_ROOT}" STREQUAL "")
 endif ()
 
 if (NOT EXISTS ${UE_ROOT})
-	message (
-		FATAL_ERROR
-		"The specified Carla Unreal Engine 5 path does not exist (\"${UE_ROOT}\").")
+	carla_error ("The specified Carla Unreal Engine 5 path does not exist (\"${UE_ROOT}\").")
 endif ()
 
 set (ARCH ${CMAKE_HOST_SYSTEM_PROCESSOR})

CMake/Options/Unreal.cmake

@@ -28,7 +28,7 @@ carla_string_option (
   "${CARLA_UNREAL_ENGINE_PATH_INFERRED}"
 )
 
-message (
+carla_message (
   "Using \"${CARLA_UNREAL_ENGINE_PATH}\" as Unreal Engine root path."
 )
 
@@ -57,11 +57,10 @@ carla_string_option (
 )
 
 if (${BUILD_CARLA_UNREAL} AND ${CARLA_HAS_UNREAL_ENGINE_PATH})
-  message (
+  carla_message (
     "Carla UE project successfully added to build. (UE path: ${CARLA_UNREAL_ENGINE_PATH})")
 else ()
-  message (
-    FATAL_ERROR
+  carla_error (
     "Could not add UE project to build since the option CARLA_UNREAL_ENGINE_PATH"
     "is not set to a valid path (\"${CARLA_UNREAL_ENGINE_PATH}\")."
     "Please set it to point to the root path of your CARLA Unreal Engine installation."

CMakeLists.txt

@@ -59,6 +59,14 @@ set (
   ${CARLA_WORKSPACE_PATH}/Unreal/CarlaUnreal/Plugins
 )
 
+macro (carla_message)
+  message (STATUS "CARLA: " ${ARGN})
+endmacro ()
+
+macro (carla_error)
+  message (FATAL_ERROR ${ARGN})
+endmacro ()
+
 include (CheckCCompilerFlag)
 include (CheckCXXCompilerFlag)
 include (CheckLinkerFlag)
@@ -80,7 +88,7 @@ endif ()
 # Similar to configure_file, but also expands variables
 # that are set at generate time, like generator expressions.
 macro (carla_two_step_configure_file DESTINATION SOURCE)
-  message ("Configuring file \"${DESTINATION}\"")
+  carla_message ("Configuring file \"${DESTINATION}\"")
   # Configure-time step; evaluate variables:
   configure_file (${SOURCE} ${DESTINATION})
   # Generate-time step; evaluate generator expressions:

Unreal/CMakeLists.txt

@@ -173,7 +173,7 @@ elseif (APPLE)
   set (EXE_EXT)
   set (UE_SYSTEM_NAME Mac)
 else ()
-  message (FATAL_ERROR "Unknown target system.")
+  carla_error ("Unknown target system.")
 endif ()
 
 set (