89516fbc25
When exporting flags to an external build system we need to deal with the fact that we sometimes use generator expressions. Specifically, we use generator expressions that look like this: $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions> This patch replaces the old API with a new one where users can ask for compile options for specific languages, like this: zephyr_get_compile_options_for_lang_as_string(CXX x) The existing API would have either crashed or silently omitted flags when a COMPILE_LANG generator expression was present. Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
56 lines
2.2 KiB
CMake
56 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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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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)
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set(MYLIB_INCLUDE_DIR ${mylib_src_dir}/include)
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set(MYLIB_LIB_DIR ${mylib_build_dir}/lib)
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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)
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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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