objcopy prepends directory pathname to symbol name

Question

I am tying to use objcopy to include a binary form of a text file into an executable. (At runtime I need the file as a string). This works fine until the linker

Answer 1

I had to do this with cmake, and I ended up using /dev/stdin as input to get consistent symbols name, then redefining the symbols thanks to string(MAKE_C_IDENTIFIER ...) And then use objcopy --redefine-sym on the resulting object file.

The resulting function is then :

function(make_binary_object __file)
    get_filename_component(__file_name ${__file} NAME)
    set(__object ${CMAKE_CURRENT_BINARY_DIR}/${__file_name}.obj)
    string(MAKE_C_IDENTIFIER ${__file_name} __file_c_identifier)
    add_custom_command(OUTPUT ${__object}
        COMMAND ${CMAKE_OBJCOPY}
            --input-format binary
            --output-format elf64-x86-64
            --binary-architecture i386:x86-64
            /dev/stdin
            ${__object} < ${__file}
        COMMAND ${CMAKE_OBJCOPY}
            --redefine-sym _binary__dev_stdin_start=_binary_${__file_c_identifier}_start
            --redefine-sym _binary__dev_stdin_end=_binary_${__file_c_identifier}_end
            --redefine-sym _binary__dev_stdin_size=_binary_${__file_c_identifier}_size
            ${__object}
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
        DEPENDS ${__file})
    set_source_files_properties(${__object} PROPERTIES EXTERNAL_OBJECT TRUE)
endfunction()

And you can use it like this:

make_binary_object(index.html)

add_executable(my_server
    server.c
    ${CMAKE_CURRENT_BINARY_DIR}/index.html.obj)