After upgrading to CMake 3.30, this fine wrapper function …

function(fetch_and_extract_archive dst_name url checksum)
    cmake_parse_arguments(ARG "POPULATE_ONLY" "" "" "${ARGN}")
    FetchContent_Declare("${dst_name}" URL ${url} URL_HASH "${checksum}")
    if(ARG_POPULATE_ONLY)
        if(NOT ${dst_name}_POPULATED)
            FetchContent_Populate(${dst_name})
        endif()
    else()
        FetchContent_MakeAvailable(${dst_name})
    endif()
    set("${dst_name}_SOURCE_DIR" "${CMAKE_BINARY_DIR}/_deps/${dst_name}-src" PARENT_SCOPE)
endfunction()

… turned into this build error:

CMake Error (dev) at /usr/share/cmake/Modules/FetchContent.cmake:1953 (message):
  Calling FetchContent_Populate() is deprecated, call
  FetchContent_MakeAvailable() instead.  Policy CMP0169 can be
  set to OLD to allow FetchContent_Populate() to be called
  directly for now, but the ability to call it with declared details will be
  removed completely in a future version.
Call Stack (most recent call first):
  …
This error is for project developers. Use -Wno-error=dev to suppress it.

Obviously, I’m trying to not use the extracted CMakeLists.txt, which is why using MakeAvailable instead is not an option.