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cmake_minimum_required(VERSION 3.13.1) include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE) project(external_lib) target_sources(app PRIVATE src/main.c) # The external static library that we are linking with does not know # how to build for this platform so we export all the flags used in # this zephyr build to the external build system. # # Other external build systems may be self-contained enough that they # do not need any build information from zephyr. Or they may be # incompatible with certain zephyr options and need them to be # filtered out. zephyr_get_include_directories_for_lang_as_string( C includes) zephyr_get_system_include_directories_for_lang_as_string(C system_includes) zephyr_get_compile_definitions_for_lang_as_string( C definitions) zephyr_get_compile_options_for_lang_as_string( C options) set(external_project_cflags "${includes} ${definitions} ${options} ${system_includes}" ) include(ExternalProject) # Add an external project to be able download and build the third # party library. In this case downloading is not necessary as it has # been committed to the repository. set(mylib_src_dir ${CMAKE_CURRENT_SOURCE_DIR}/mylib) set(mylib_build_dir ${CMAKE_CURRENT_BINARY_DIR}/mylib) set(MYLIB_LIB_DIR ${mylib_build_dir}/lib) set(MYLIB_INCLUDE_DIR ${mylib_src_dir}/include) ExternalProject_Add( mylib_project # Name for custom target PREFIX ${mylib_build_dir} # Root dir for entire project SOURCE_DIR ${mylib_src_dir} BINARY_DIR ${mylib_src_dir} # This particular build system is invoked from the root CONFIGURE_COMMAND "" # Skip configuring the project, e.g. with autoconf BUILD_COMMAND make PREFIX=${mylib_build_dir} CC=${CMAKE_C_COMPILER} AR=${CMAKE_AR} CFLAGS=${external_project_cflags} INSTALL_COMMAND "" # This particular build system has no install command BUILD_BYPRODUCTS ${MYLIB_LIB_DIR}/libmylib.a ) # Create a wrapper CMake library that our app can link with add_library(mylib_lib STATIC IMPORTED GLOBAL) add_dependencies( mylib_lib mylib_project ) set_target_properties(mylib_lib PROPERTIES IMPORTED_LOCATION ${MYLIB_LIB_DIR}/libmylib.a) set_target_properties(mylib_lib PROPERTIES INTERFACE_INCLUDE_DIRECTORIES ${MYLIB_INCLUDE_DIR}) target_link_libraries(app PUBLIC mylib_lib) |