core/pkgs/by-name/gc/gcc/common/strip-attributes.nix

{
  lib,
  stdenv,
  langJit,
}:

{
  # Note [Cross-compiler stripping]
  # gcc requires delicate stripping as it installs ELF files for both
  # HOST and TARGET platforms. It requires according strip tool otherwise
  # strip could remove sections it's not aware of.
  # Example ARM breakage by x86_64 strip: https://bugs.gentoo.org/697428
  #
  # Let's recap the file layout for directories with object files for a
  # cross-compiler:
  #
  # $out (host != target)
  # `- bin: HOST
  #    lib/*.{a,o}: HOST
  #      `- gcc/<TARGET>/<VERSION>/*.{a,o}: TARGET
  #                               `- plugin/: HOST
  #  `- lib{,32,64,x32}: symlink to lib or identical layout
  #  `- libexec/: HOST
  #  `- <TARGET>/: TARGET
  #
  # $out (host == target) has identical directory layout.
  #
  # $lib (host != target):
  # `- <TARGET>/lib/*.{la,so}: TARGET
  #
  # $lib (host == target):
  # `- lib/*.{la,so}: HOST

  # The rest of stripDebugList{Host,Target} will be populated in
  # postInstall to disambiguate lib/ object files.
  stripDebugList = [
    "bin"
    "libexec"
  ];
  stripDebugListTarget = [ stdenv.targetPlatform.config ];

  preFixup =
    ''
      # Populate most delicated lib/ part of stripDebugList{,Target}
      updateDebugListPaths() {
        local oldOpts
        oldOpts="$(shopt -p nullglob)" || true
        shopt -s nullglob

        pushd $out
        local -ar outHostFiles=(
          lib{,32,64}/*.{a,o,so*}
          lib{,32,64}/gcc/${stdenv.targetPlatform.config}/*/plugin
        )
        local -ar outTargetFiles=(
          lib{,32,64}/gcc/${stdenv.targetPlatform.config}/*/*.{a,o,so*}
        )
        popd
    ''
    + lib.optionalString (!langJit) ''
      ${
        # keep indentation
        ""
      }
        pushd $lib
        local -ar libHostFiles=(
          lib{,32,64}/*.{a,o,so*}
        )
        local -ar libTargetFiles=(
          lib{,32,64}/${stdenv.targetPlatform.config}/*.{a,o,so*}
        )
        popd

    ''
    + ''
        eval "$oldOpts"

        stripDebugList="$stripDebugList ''${outHostFiles[*]} ''${libHostFiles[*]}"
        stripDebugListTarget="$stripDebugListTarget ''${outTargetFiles[*]} ''${libTargetFiles[*]}"
      }
      updateDebugListPaths
    '';
}