events: pass relative paths plus base path to source parser script (#22551)

* events: pass relative paths plus base path to source parser script

to work around maximum Makefile command lenght limits.

* events: correct cmake comment typo

Co-authored-by: Beat Küng <beat-kueng@gmx.net>

---------

Co-authored-by: Beat Küng <beat-kueng@gmx.net>

CMakeLists.txt

@@ -148,6 +148,7 @@ define_property(GLOBAL PROPERTY PX4_MODULE_PATHS
                  BRIEF_DOCS "PX4 module paths"
                  FULL_DOCS "List of paths to all PX4 modules"
                  )
+
 define_property(GLOBAL PROPERTY PX4_SRC_FILES
                  BRIEF_DOCS "src files from all PX4 modules & libs"
                  FULL_DOCS "SRC files from px4_add_{module,library}"

Tools/px_process_events.py

@@ -55,6 +55,10 @@ def main():
                         metavar="PATH",
                         nargs='*',
                         help="one or more paths/files to source files to scan for events")
+    parser.add_argument("-b", "--base-path",
+                        default=[""],
+                        metavar="PATH",
+                        help="path prefix for everything passed with --src-path")
     parser.add_argument("-j", "--json",
                         nargs='?',
                         const="events.json",
@@ -84,7 +88,7 @@ def main():
     # canonicalize + remove duplicates
     src_paths = set()
     for path in args.src_path:
-        src_paths.add(os.path.realpath(path))
+        src_paths.add(os.path.realpath(os.path.join(args.base_path, path)))
 
     if not scanner.ScanDir(src_paths, parser):
         sys.exit(1)

src/lib/events/CMakeLists.txt

@@ -35,13 +35,21 @@ px4_add_git_submodule(TARGET git_libevents PATH "libevents")
 
 get_property(all_px4_src_files GLOBAL PROPERTY PX4_SRC_FILES)
 
+# Use relative path list to work around Makefile command character limit
+set(all_px4_src_files_relative "")
+foreach(f ${all_px4_src_files})
+	file(RELATIVE_PATH relative_path ${PX4_SOURCE_DIR}/src ${f})
+	list(APPEND all_px4_src_files_relative "${relative_path}")
+endforeach(f)
+
 set(generated_events_dir ${PX4_BINARY_DIR}/events)
 set(generated_events_px4_file ${generated_events_dir}/px4.json)
 set(generated_events_common_enums_file ${generated_events_dir}/common_with_enums.json)
 add_custom_command(OUTPUT ${generated_events_px4_file}
 	COMMAND ${CMAKE_COMMAND} -E make_directory ${generated_events_dir}
 	COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/px_process_events.py
-		--src-path ${all_px4_src_files}
+		--base-path ${PX4_SOURCE_DIR}/src
+		--src-path ${all_px4_src_files_relative}
 		--json ${generated_events_px4_file} #--verbose
 	DEPENDS
 		${all_px4_src_files}