cmake: Add zpp target

Create a CMake target to build the annotations together with a depfile.

Signed-off-by: Pieter De Gendt <[email protected]>

CMakeLists.txt

@@ -121,6 +121,7 @@ zephyr_include_directories(
   ${STDINCLUDE}
 )
 
+include(${ZEPHYR_BASE}/cmake/zpp.cmake)
 include(${ZEPHYR_BASE}/cmake/linker_script/${ARCH}/linker.cmake OPTIONAL)
 
 zephyr_include_directories(${SOC_FULL_DIR})

cmake/zpp.cmake

@@ -0,0 +1,27 @@
+# Copyright (c) 2024 Basalte bv
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Generate compile_commands.json in the output directory
+set(CMAKE_EXPORT_COMPILE_COMMANDS TRUE CACHE BOOL
+    "Export CMake compile commands. Used by zpp.py script"
+    FORCE
+)
+
+set(annotations_json "${CMAKE_BINARY_DIR}/zephyr/annotations.json")
+
+add_custom_command(
+  OUTPUT ${annotations_json}
+  COMMAND
+    ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/scripts/zpp.py
+    -j ${CMAKE_BUILD_PARALLEL_LEVEL}
+    -o ${annotations_json}
+    -d ${annotations_json}.d
+    ${CMAKE_BINARY_DIR}/compile_commands.json
+  DEPENDS
+    ${ZEPHYR_BASE}/scripts/zpp.py
+    ${CMAKE_BINARY_DIR}/compile_commands.json
+  DEPFILE ${annotations_json}.d
+)
+
+add_custom_target(zpp DEPENDS ${annotations_json})