Add a stdenv adapter ‘useGoldLinker’ to force use of Gold

pkgs/stdenv/adapters.nix

@@ -2,8 +2,7 @@
    a new stdenv with different behaviour, e.g. using a different C
    compiler. */
 
-{dietlibc, fetchurl, runCommand}:
-
+pkgs:
 
 rec {
 
@@ -57,13 +56,13 @@ rec {
 
         NIX_GCC = import ../build-support/gcc-wrapper {
           inherit stdenv;
-          libc = dietlibc;
+          libc = pkgs.dietlibc;
           inherit (stdenv.gcc) gcc binutils nativeTools nativePrefix;
           nativeLibc = false;
         };
       });
       isDietLibC = true;
-    } // {inherit fetchurl;};
+    };
 
 
   # Return a modified stdenv that uses klibc to create small
@@ -80,7 +79,7 @@ rec {
         configureFlags =
           args.configureFlags or "" + " --disable-shared"; # brrr...
 
-        NIX_GCC = runCommand "klibc-wrapper" {} ''
+        NIX_GCC = pkgs.runCommand "klibc-wrapper" {} ''
           mkdir -p $out/bin
           ln -s ${klibc}/bin/klcc $out/bin/gcc
           ln -s ${klibc}/bin/klcc $out/bin/cc
@@ -90,7 +89,7 @@ rec {
       });
       isKlibc = true;
       isStatic = true;
-    } // {inherit fetchurl;};
+    };
 
 
   # Return a modified stdenv that tries to build statically linked
@@ -103,7 +102,7 @@ rec {
           + " --disable-shared"; # brrr...
       });
       isStatic = true;
-    } // {inherit fetchurl;};
+    };
 
 
   # Return a modified stdenv that builds static libraries instead of
@@ -115,7 +114,7 @@ rec {
           toString args.configureFlags or ""
           + " --enable-static --disable-shared";
       });
-    } // {inherit fetchurl;};
+    };
 
 
   # Return a modified stdenv that adds a cross compiler to the
@@ -277,7 +276,7 @@ rec {
   */
   replaceMaintainersField = stdenv: pkgs: maintainers: stdenv //
     { mkDerivation = args:
-        pkgs.lib.recursiveUpdate
+        stdenv.lib.recursiveUpdate
           (stdenv.mkDerivation args)
           { meta.maintainers = maintainers; };
     };
@@ -354,4 +353,17 @@ rec {
       });
     };
 
+
+  /* Modify a stdenv so that it used the Gold linker. */
+  useGoldLinker = stdenv:
+    let
+      binutils = stdenv.gcc.binutils;
+      binutils' = pkgs.runCommand "${binutils.name}-gold" { }
+        ''
+          mkdir -p $out/bin
+          ln -s ${binutils}/bin/* $out/bin/
+          ln -sfn ${binutils}/bin/ld.gold $out/bin/ld
+        ''; # */
+    in overrideGCC stdenv (stdenv.gcc.override { binutils = binutils'; });
+
 }

pkgs/stdenv/linux/default.nix

@@ -11,6 +11,8 @@
 
 rec {
 
+  lib = import ../../../lib;
+
   bootstrapFiles =
     if system == "i686-linux" then import ./bootstrap/i686
     else if system == "x86_64-linux" then import ./bootstrap/x86_64
@@ -134,9 +136,9 @@ rec {
 
   # A helper function to call gcc-wrapper.
   wrapGCC =
-    {gcc ? bootstrapTools, libc, binutils, coreutils, shell ? "", name ? "bootstrap-gcc-wrapper"}:
+    { gcc ? bootstrapTools, libc, binutils, coreutils, shell ? "", name ? "bootstrap-gcc-wrapper" }:
 
-    import ../../build-support/gcc-wrapper {
+    lib.makeOverridable (import ../../build-support/gcc-wrapper) {
       nativeTools = false;
       nativeLibc = false;
       inherit gcc binutils coreutils libc shell name;

pkgs/top-level/all-packages.nix

@@ -97,7 +97,7 @@ let
     (import ../build-support/trivial-builders.nix { inherit (pkgs) stdenv; inherit (pkgs.xorg) lndir; });
 
   stdenvAdapters =
-    import ../stdenv/adapters.nix { inherit (pkgs) dietlibc fetchurl runCommand; };
+    import ../stdenv/adapters.nix pkgs;
 
 
   # Allow packages to be overriden globally via the `packageOverrides'
@@ -3060,9 +3060,9 @@ let
     inherit stdenv coreutils zlib;
   };
 
-  wrapClang = wrapClangWith (import ../build-support/clang-wrapper) glibc;
+  wrapClang = wrapClangWith (makeOverridable (import ../build-support/clang-wrapper)) glibc;
 
-  wrapGCC = wrapGCCWith (import ../build-support/gcc-wrapper) glibc;
+  wrapGCC = wrapGCCWith (makeOverridable (import ../build-support/gcc-wrapper)) glibc;
 
   wrapGCCCross =
     {gcc, libc, binutils, cross, shell ? "", name ? "gcc-cross-wrapper"}: