4d9499cbeb
Having a library being GLOBAL, although not default behaviour, or necessary for the sample, is expected behaviour for a library. It is expected that like normal libraries, the target name will be accessible from outside of the CMakeLists.txt file that created it. Since samples are used as reference code, we specify GLOBAL so that libraries are created with this intuitive behaviour. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
59 lines
2.2 KiB
CMake
59 lines
2.2 KiB
CMake
include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
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project(NONE)
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target_sources(app PRIVATE src/main.c)
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# The external static library that we are linking with does not know
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# how to build for this platform so we export all the flags used in
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# this zephyr build to the external build system.
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#
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# Other external build systems may be self-contained enough that they
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# do not need any build information from zephyr. Or they may be
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# incompatible with certain zephyr options and need them to be
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# filtered out.
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zephyr_get_include_directories_for_lang_as_string( C includes)
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zephyr_get_system_include_directories_for_lang_as_string(C system_includes)
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zephyr_get_compile_definitions_for_lang_as_string( C definitions)
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zephyr_get_compile_options_for_lang_as_string( C options)
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set(external_project_cflags
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"${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=${CMAKE_C_COMPILER}
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CFLAGS=${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 mylib_lib)
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