apple-sdk: add hack for C++ issues on `x86_64-darwin`

        llvm-readtapi --filetype=tbd-v4 usr/lib/$libSystem~ -o usr/lib/$libSystem

        rm usr/lib/$libSystem~

      done

      # Strip weak C++ symbols to work around `libc++` leakage in system

      # frameworks for now. These are only present on `x86_64-darwin`, so

      # it should hopefully be harmless.

      #

      # TODO FIXME: This is kind of horrible.

      while read -r -d "" stub; do

        printf 'Stripping weak C++ symbols from %s\n' "$stub"

        llvm-readtapi --filetype=tbd-v5 "$stub" \

        | jq '

          (.main_library, .libraries[]?).exported_symbols[]?.data.weak[]? |=

            select(startswith("__Z") | not)

        ' > $stub~

        llvm-readtapi --filetype=tbd-v4 $stub~ -o $stub

        rm $stub~

      done < <(find . -name '*.tbd' -print0)

    '';

}