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# SPDX-License-Identifier: Apache-2.0
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)
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