cmake environment does not support COMPONENT_EXTRA_INCLUDES and COMPONENT_BUILD_DIR (GIT8266O-369)

[THKDev]

Environment

• Development Kit: ESP8266
• IDF version: d1cfba3 (branch v3.3)
• Development Env: CMake
• Operating System: Linux
• Power Supply: external 3.3V|

Problem Description

Regarding to build-system.rst documentation variables COMPONENT_EXTRA_INCLUDES and COMPONENT_BUILD_DIR should be used for component specific settings. This is fully working with component.mk. But this won't work within CMakeLists.txt for the same component.

Code to reproduce this issue

Sample component.mk

#
# "main" pseudo-component makefile.
#
# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

COMPONENT_EXTRA_INCLUDES=$(COMPONENT_BUILD_DIR)/generated

Sample CMakeLists.txt

# https://cmake.org/cmake/help/latest/module/CMakePrintHelpers.html
include(${CMAKE_ROOT}/Modules/CMakePrintHelpers.cmake)

set(COMPONENT_SRCS "main.cc")
set(COMPONENT_ADD_INCLUDEDIRS "include")
set(COMPONENT_EXTRA_INCLUDES "${COMPONENT_BUILD_DIR}/generated")

cmake_print_variables(COMPONENT_EXTRA_INCLUDES COMPONENT_BUILD_DIR)

register_component()