cmake: ensure generated source files exist before extracting events

Only needed for Makefile-based builds:
gmake[3]: *** No rule to make target 'src/modules/flight_mode_manager/FlightTasks_generated.hpp', needed by 'events/px4.json'.  Stop.

msg/CMakeLists.txt

@@ -34,6 +34,8 @@
 # Support IN_LIST if() operator
 cmake_policy(SET CMP0057 NEW)
 
+include(px4_list_make_absolute)
+
 set(msg_files
 	actuator_armed.msg
 	actuator_controls.msg
@@ -230,6 +232,8 @@ if(invalid_msgs)
 	endif()
 endif()
 
+px4_list_make_absolute(msg_files ${CMAKE_CURRENT_SOURCE_DIR} ${msg_files})
+
 if(NOT EXTERNAL_MODULES_LOCATION STREQUAL "")
 	# Check that the msg directory and the CMakeLists.txt file exists
 	if(EXISTS ${EXTERNAL_MODULES_LOCATION}/msg/CMakeLists.txt)

src/lib/events/CMakeLists.txt

@@ -49,6 +49,7 @@ add_custom_command(OUTPUT ${generated_events_px4_file}
 		${PX4_SOURCE_DIR}/Tools/px4events/jsonout.py
 		${PX4_SOURCE_DIR}/Tools/px4events/srcparser.py
 		${PX4_SOURCE_DIR}/Tools/px4events/srcscanner.py
+		prebuild_targets # ensure all generated source files exist
 	COMMENT "Generating px4 event json file from source"
 )
 add_custom_target(events_px4_json DEPENDS ${generated_events_px4_file})

src/modules/flight_mode_manager/CMakeLists.txt

@@ -99,6 +99,9 @@ add_custom_command(
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 	VERBATIM
 )
+add_custom_target(flighttasks_generated
+	DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/FlightTasks_generated.cpp)
+add_dependencies(prebuild_targets flighttasks_generated)
 
 add_compile_options(
 	-Wno-cast-align
@@ -123,6 +126,7 @@ px4_add_module(
 	DEPENDS
 		px4_work_queue
 		WeatherVane
+		flighttasks_generated
 )
 
 # add all flight task dependencies

src/systemcmds/topic_listener/CMakeLists.txt

@@ -33,15 +33,15 @@
 
 add_custom_command(OUTPUT listener_generated.cpp
 	COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/generate_listener.py ${PX4_SOURCE_DIR} ${msg_files} > listener_generated.cpp
-	DEPENDS generate_listener.py uorb_msgs
+	DEPENDS generate_listener.py ${msg_files}
 )
 
 add_custom_target(generate_topic_listener
 	DEPENDS
 		listener_generated.cpp
 		generate_listener.py
-		uorb_msgs
 )
+add_dependencies(prebuild_targets generate_topic_listener)
 
 px4_add_module(
 	MODULE systemcmds__topic_listener
@@ -56,5 +56,6 @@ px4_add_module(
 		${CMAKE_CURRENT_BINARY_DIR}/listener_generated.cpp
 	DEPENDS
 		generate_topic_listener
+		uorb_msgs
 	)