expand-response-params: Pull out of cc-wrapper

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pkgs/build-support/cc-wrapper/default.nix

···
     else if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1"
     else null;
 
-  expand-response-params = if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
-  then buildPackages.stdenv.mkDerivation {
-    name = "expand-response-params";
-    src = ./expand-response-params.c;
-    buildCommand = ''
-      # Work around "stdenv-darwin-boot-2 is not allowed to refer to path /nix/store/...-expand-response-params.c"
-      cp "$src" expand-response-params.c
-      "$CC" -std=c99 -O3 -o "$out" expand-response-params.c
-      strip -S $out
-      ${optionalString hostPlatform.isLinux "patchelf --shrink-rpath $out"}
-    '';
-  } else "";
+  expand-response-params =
+    if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
+    then import ../expand-response-params { inherit (buildPackages) stdenv; }
+    else "";
 
 in
 

pkgs/build-support/expand-response-params/default.nix

···
+{ stdenv }:
+
+stdenv.mkDerivation {
+  name = "expand-response-params";
+  src = ./expand-response-params.c;
+  buildCommand = ''
+    # Work around "stdenv-darwin-boot-2 is not allowed to refer to path /nix/store/...-expand-response-params.c"
+    cp "$src" expand-response-params.c
+    "$CC" -std=c99 -O3 -o "$out" expand-response-params.c
+    strip -S $out
+    ${stdenv.lib.optionalString stdenv.hostPlatform.isLinux "patchelf --shrink-rpath $out"}
+  '';
+}