Add defs generator.

tools/CMakeLists.txt

@@ -11,4 +11,21 @@ function(add_asset ASSET_TYPE ASSET_PATH)
     "${ASSET_TYPE}#${FULL_ASSET_PATH}#${ASSETS_ARGS}"
   )
   set(DUSK_ASSETS ${DUSK_ASSETS} CACHE INTERNAL ${DUSK_CACHE_TARGET})
+endfunction()
+
+function(add_defs INPUT_PATH OUTPUT_NAME_RELATIVE)
+  set(INPUT_FULL_PATH "${CMAKE_CURRENT_LIST_DIR}/${INPUT_PATH}")
+  set(OUTPUT_FULL_PATH "${DUSK_GENERATED_HEADERS_DIR}/${OUTPUT_NAME_RELATIVE}")
+
+  add_custom_command(
+    OUTPUT ${OUTPUT_FULL_PATH}
+    COMMAND ${CMAKE_COMMAND}
+      -DENV_FILE=${INPUT_FULL_PATH}
+      -DOUT_HEADER=${OUTPUT_FULL_PATH}
+      -P ${CMAKE_SOURCE_DIR}/cmake/modules/envtoh.cmake
+    DEPENDS ${INPUT_FULL_PATH} ${CMAKE_SOURCE_DIR}/cmake/modules/envtoh.cmake
+    COMMENT "Generating ${OUTPUT_NAME_RELATIVE}"
+  )
+  add_custom_target(${OUTPUT_NAME_RELATIVE}_header DEPENDS ${OUTPUT_FULL_PATH})
+  add_dependencies(${DUSK_TARGET_NAME} ${OUTPUT_NAME_RELATIVE}_header)
 endfunction()