esp-idf/examples/build_system/cmake/idf_as_lib/CMakeLists.txt

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CMake

cmake_minimum_required(VERSION 3.5)
project(idf_as_lib C)
set(targets "esp32" "esp32s2" "esp32s3" "esp32c3" "esp32h2")
if("${TARGET}" IN_LIST targets)
# Include for ESP-IDF build system functions
include($ENV{IDF_PATH}/tools/cmake/idf.cmake)
# Create idf::{target} and idf::freertos static libraries
idf_build_process("${TARGET}"
# try and trim the build; additional components
# will be included as needed based on dependency tree
#
# although esptool_py does not generate static library,
# processing the component is needed for flashing related
# targets and file generation
COMPONENTS "${TARGET}" freertos esptool_py
SDKCONFIG ${CMAKE_CURRENT_LIST_DIR}/sdkconfig
BUILD_DIR ${CMAKE_BINARY_DIR})
else()
message(WARNING "Unknown target ${TARGET}, creating stubs for esp32 instead")
# Create stubs for esp32 and freertos, stub::esp32 and stub::freertos
add_subdirectory(stubs/esp32)
add_subdirectory(stubs/freertos)
add_subdirectory(stubs/spi_flash)
endif()
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(elf_file ${CMAKE_PROJECT_NAME}.elf)
add_executable(${elf_file} main.c)
# Link the static libraries to the executable
if("${TARGET}" IN_LIST targets)
target_link_libraries(${elf_file} "idf::${TARGET}" idf::freertos idf::spi_flash)
# Attach additional targets to the executable file for flashing,
# linker script generation, partition_table generation, etc.
idf_build_executable(${elf_file})
else()
target_link_libraries(${elf_file} stub::esp32 stub::freertos stub::spi_flash)
endif()