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80 lines
2.8 KiB
CMake
80 lines
2.8 KiB
CMake
# The script is to generate ELF for application
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# Trick to temporarily redefine project(). When functions are overridden in CMake, the originals can still be accessed
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# using an underscore prefixed function of the same name. The following lines make sure that project calls
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# the original project(). See https://cmake.org/pipermail/cmake/2015-October/061751.html.
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function(project_elf)
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endfunction()
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function(_project_elf)
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endfunction()
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macro(project_elf project_name)
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# Enable these options to remove unused symbols and reduce linked objects
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set(cflags -nostartfiles
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-nostdlib
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-fPIC
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-shared
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-e app_main
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-fdata-sections
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-ffunction-sections
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-Wl,--gc-sections
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-fvisibility=hidden)
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# Enable this options to remove unnecessary sections in
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list(APPEND cflags -Wl,--strip-all
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-Wl,--strip-debug
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-Wl,--strip-discarded)
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list(APPEND cflags -Dmain=app_main)
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idf_build_set_property(COMPILE_OPTIONS "${cflags}" APPEND)
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set(elf_app "${CMAKE_PROJECT_NAME}.app.elf")
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# Remove more unused sections
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string(REPLACE "-elf-gcc" "-elf-strip" ${CMAKE_STRIP} ${CMAKE_C_COMPILER})
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set(strip_flags --strip-unneeded
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--remove-section=.comment
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--remove-section=.got.loc
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--remove-section=.dynamic)
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if(CONFIG_IDF_TARGET_ARCH_XTENSA)
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list(APPEND strip_flags --remove-section=.xt.lit
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--remove-section=.xt.prop
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--remove-section=.xtensa.info)
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elseif(CONFIG_IDF_TARGET_ARCH_RISCV)
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list(APPEND strip_flags --remove-section=.riscv.attributes)
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endif()
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# Link input list of libraries to ELF
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list(PREPEND ELF_COMPONENTS "main")
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if(ELF_COMPONENTS)
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foreach(c ${ELF_COMPONENTS})
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list(APPEND elf_libs "esp-idf/${c}/lib${c}.a")
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if(${CMAKE_GENERATOR} STREQUAL "Unix Makefiles")
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add_custom_command(OUTPUT elf_${c}_app
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COMMAND +${CMAKE_MAKE_PROGRAM} "__idf_${c}/fast"
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COMMENT "Build Component: ${c}"
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)
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list(APPEND elf_dependeces "elf_${c}_app")
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else()
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list(APPEND elf_dependeces "idf::${c}")
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endif()
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endforeach()
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endif()
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if (ELF_LIBS)
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list(APPEND elf_libs "${ELF_LIBS}")
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endif()
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spaces2list(elf_libs)
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add_custom_command(OUTPUT elf_app
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COMMAND ${CMAKE_C_COMPILER} ${cflags} ${elf_libs} -o ${elf_app}
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COMMAND ${CMAKE_STRIP} ${strip_flags} ${elf_app}
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DEPENDS ${elf_dependeces}
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COMMENT "Build ELF: ${elf_app}"
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)
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add_custom_target(elf ALL DEPENDS elf_app)
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endmacro()
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