CMake:将ELF嵌入可执行文件 [英] CMake: Embed ELF into executable

问题描述

我有一个项目，需要访问特殊部分.

I have a project that needs access to an ELF file embedded into the executable in a special section.

我以前是手工制作Makefile的，只是有一个shell脚本，我在其中使用objcopy将要嵌入的目标复制到.o文件中，然后在可执行文件中链接到该文件.

I was handcrafting Makefiles before and simply had a shell script where I used objcopy to copy the target I wanted to embed into an .o file, then link to this file in the executable.

# Create a new section and copy the binary there ($1=input $2=output name)
objcopy --input-target binary --output-target elf64-x86-64 \
        --binary-architecture i386 $1 $2.o

现在，我要摆脱自定义的Makefile，并使用CMake生成它们.但是，我看不到链接到此类文件的简便方法.我可以创建和添加此文件，但不能对其进行链接:

Now I want to get rid of the custom Makefiles and use CMake to generate them. However, I don't see an easy way to link to such a file. I am able to create and add this file, but not to link against it:

# Invoke script to package module as a library
add_custom_command(OUTPUT ${PACKAGED_FILE}
  COMMAND ./package.sh ${MODULE_FILE} ${PACKAGED_FILE}
  WORKING_DIRECTORY ${MODULE_DIR}
  DEPENDS ${MODULE_FILE}
  COMMENT packaging file into ELF object
  VERBATIM
)

add_custom_target(${PACKAGED_NAME} ALL DEPENDS ${PACKAGED_FILE})

我尝试将其添加为:

target_link_libraries(binary ${PROJECT_BINARY_DIR}/${PACKAGED_FILE})

但是，这失败了，因为文件还不存在.会的，但是CMake不知道.将目标名称添加为链接库也无济于事，因为找不到它.将其添加为还依赖项也无济于事.有谁知道如何实现这一目标?

However, this fails because the file isn't there yet. It will be, but CMake doesn't know that. Adding the target name as a link library doesn't help either because it can't be found. Adding it as a also dependency doesn't help. Does anyone have an idea how this could be accomplished?

推荐答案

我们在项目中正在做类似的事情-CMakeLists.txt的以下部分起到了作用:

We are doing a similar thing in our project - the following part of our CMakeLists.txt does the trick:

set(PROJECT_EMBED_OBJ_FILES "")
set(PROJECT_EMBED_FILES "file1.elf" "file2.elf")
foreach(FILENAME ${PROJECT_EMBED_FILES})
    get_filename_component(FILENAME_ONLY ${FILENAME} NAME)
    get_filename_component(FILEPATH_ONLY ${FILENAME} PATH)
    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${FILENAME_ONLY}.o 
                       WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/${FILEPATH_ONLY} 
                       COMMAND ${CMAKE_OBJCOPY} 
                       ARGS -I binary -O elf64-x86-64 -B i386 ${FILENAME_ONLY} ${CMAKE_CURRENT_BINARY_DIR}/${FILENAME_ONLY}.o )
    list(APPEND PROJECT_EMBED_OBJ_FILES ${CMAKE_CURRENT_BINARY_DIR}/${FILENAME_ONLY}.o)
    message(STATUS "Objcopy'ing ${FILENAME}")
endforeach(FILENAME)

然后在对add_executable的调用中:

add_executable(projectname ${PROJECT_SOURCES} ${PROJECT_EMBED_OBJ_FILES})

这篇关于CMake:将ELF嵌入可执行文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！