Merge branch 'master' into closure-size

TODO: there was more significant refactoring of qtbase and plasma 5.5
on master, and I'm deferring pointing to correct outputs to later.

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

@@ -58,7 +58,7 @@ assert langGo -> langCC;
 with stdenv.lib;
 with builtins;
 
-let version = "5.2.0";
+let version = "5.3.0";
 
     # Whether building a cross-compiler for GNU/Hurd.
     crossGNU = cross != null && cross.config == "i586-pc-gnu";
@@ -211,7 +211,7 @@ stdenv.mkDerivation ({
 
   src = fetchurl {
     url = "mirror://gnu/gcc/gcc-${version}/gcc-${version}.tar.bz2";
-    sha256 = "1bccp8a106xwz3wkixn65ngxif112vn90qf95m6lzpgpnl25p0sz";
+    sha256 = "1ny4smkp5bzs3cp8ss7pl6lk8yss0d9m4av1mvdp72r1x695akxq";
   };
 
   inherit patches;