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