Merge staging into closure-size

This makes gcc5 the default builder, etc.

pkgs/development/compilers/gcc/5/default.nix

@@ -196,7 +196,7 @@ let version = "5.2.0";
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
+  bootstrap = cross == null;
 
 in
 
@@ -208,8 +208,6 @@ stdenv.mkDerivation ({
 
   builder = ../builder.sh;
 
-  outputs = [ "out" "info" ];
-
   src = fetchurl {
     url = "mirror://gnu/gcc/gcc-${version}/gcc-${version}.tar.bz2";
     sha256 = "1bccp8a106xwz3wkixn65ngxif112vn90qf95m6lzpgpnl25p0sz";
@@ -217,6 +215,12 @@ stdenv.mkDerivation ({
 
   inherit patches;
 
+  outputs = [ "out" "lib" "doc" ];
+  setOutputFlags = false;
+  NIX_NO_SELF_RPATH = true;
+
+  libc_dev = stdenv.cc.libc_dev;
+
   postPatch =
     if (stdenv.isGNU
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
@@ -357,7 +361,7 @@ stdenv.mkDerivation ({
       )
     }
     ${if (stdenv ? glibc && cross == null)
-      then " --with-native-system-header-dir=${stdenv.glibc}/include"
+      then " --with-native-system-header-dir=${stdenv.glibc.dev}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
     ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}