Using CPackDeb.cmake's symbol splitting outside of CPack

anthonya · January 28, 2024, 10:50pm

Hey all,

I noticed the following functionality in CPack:

Kitware/CMake/blob/f434d650ee1b909ce11ff984aad20ffab6843221/Modules/Internal/CPack/CPackDeb.cmake#L213-L268


      
          foreach(_FILE IN LISTS CPACK_DEB_UNSTRIPPED_FILES)
          
            # Get the file's Build ID
            execute_process(COMMAND env LC_ALL=C ${CPACK_READELF_EXECUTABLE} -n "${_FILE}"
              WORKING_DIRECTORY "${CPACK_TEMPORARY_DIRECTORY}"
              OUTPUT_VARIABLE READELF_OUTPUT
              RESULT_VARIABLE READELF_RESULT
              ERROR_VARIABLE READELF_ERROR
              OUTPUT_STRIP_TRAILING_WHITESPACE )
            if(NOT READELF_RESULT EQUAL 0)
              message(FATAL_ERROR "CPackDeb: readelf: '${READELF_ERROR}';\n"
                  "executed command: '${CPACK_READELF_EXECUTABLE} -n ${_FILE}'")
            endif()
            if(READELF_OUTPUT MATCHES "Build ID: ([0-9a-zA-Z][0-9a-zA-Z])([0-9a-zA-Z]*)")
              set(_BUILD_ID_START ${CMAKE_MATCH_1})
              set(_BUILD_ID_REMAINING ${CMAKE_MATCH_2})
              list(APPEND BUILD_IDS ${_BUILD_ID_START}${_BUILD_ID_REMAINING})
            else()
              message(FATAL_ERROR "Unable to determine Build ID for ${_FILE}")
            endif()

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Is there some way to use this functionality in a simple cmake install?

I currently know of cmake --install build --strip, but I don’t know of a way to also pull out the debug symbols into a separate file before stripping.

ben.boeckel · February 4, 2024, 7:39pm

CMake doesn’t model this right now, so I don’t think there’s a single “please separate out debuginfo from binaries” option to toggle. There may already be an issue to track, but a new one is fine too.