core/pkgs/by-name/gc/gcc/common/extra-target-flags.nix

{ lib, stdenv, withoutTargetLibc, langD ? false, libcCross, threadsCross }:

let inherit (stdenv) hostPlatform targetPlatform;

in {
  # For non-cross builds these flags are currently assigned in builder.sh.
  # It would be good to consolidate the generation of makeFlags
  # ({C,CXX,LD}FLAGS_FOR_{BUILD,TARGET}, etc...) at some point.
  EXTRA_FLAGS_FOR_TARGET = let
    mkFlags = dep: langD:
      lib.optionals (targetPlatform != hostPlatform && dep != null && !langD)
      ([ "-O2 -idirafter ${lib.getDev dep}${dep.incdir or "/include"}" ]
        ++ lib.optionals (!withoutTargetLibc)
        [ "-B${lib.getLib dep}${dep.libdir or "/lib"}" ]);
  in mkFlags libcCross langD ++ lib.optionals (!withoutTargetLibc)
  (mkFlags (threadsCross.package or null) langD);

  EXTRA_LDFLAGS_FOR_TARGET = let
    mkFlags = dep:
      lib.optionals (targetPlatform != hostPlatform && dep != null)
      ([ "-Wl,-L${lib.getLib dep}${dep.libdir or "/lib"}" ]
        ++ (if withoutTargetLibc then
          [ "-B${lib.getLib dep}${dep.libdir or "/lib"}" ]
        else [
          "-Wl,-rpath,${lib.getLib dep}${dep.libdir or "/lib"}"
          "-Wl,-rpath-link,${lib.getLib dep}${dep.libdir or "/lib"}"
        ]));
  in mkFlags libcCross ++ lib.optionals (!withoutTargetLibc)
  (mkFlags (threadsCross.package or null));
}