Merge branch 'master' into staging-next

There were several more conflicts from name -> pname+version;
all auto-solved by kdiff3, hopefully OK.

Hydra nixpkgs: ?compare=1538611

pkgs/development/compilers/solc/default.nix

@@ -1,9 +1,10 @@
 { stdenv, fetchzip, boost, cmake, ncurses, python2
-, z3Support ? true, z3 ? null
+, z3Support ? true, z3 ? null, cvc4Support ? true, cvc4 ? null
+, cln ? null, gmp ? null
 }:
 
-assert z3Support -> z3 != null;
-assert z3Support -> stdenv.lib.versionAtLeast z3.version "4.6.0";
+assert z3Support -> z3 != null && stdenv.lib.versionAtLeast z3.version "4.6.0";
+assert cvc4Support -> cvc4 != null && cln != null && gmp != null;
 
 let
   jsoncppURL = https://github.com/open-source-parsers/jsoncpp/archive/1.8.4.tar.gz;
@@ -16,12 +17,12 @@ in
 stdenv.mkDerivation rec {
 
   pname = "solc";
-  version = "0.5.10";
+  version = "0.5.11";
 
   # upstream suggests avoid using archive generated by github
   src = fetchzip {
     url = "https://github.com/ethereum/solidity/releases/download/v${version}/solidity_${version}.tar.gz";
-    sha256 = "1ns562h8blvv32lz462rf5835fs2hgn698mvi6ss5y7ar6k5y5xw";
+    sha256 = "0679s5pqbfy7fgpb4f3ppgj8iafxb64g046v8vhp29mf3dsdcnyl";
   };
 
   patches = stdenv.lib.optionals buildSharedLibs [ ./patches/shared-libs-install.patch ];
@@ -37,10 +38,14 @@ stdenv.mkDerivation rec {
     "-DBUILD_SHARED_LIBS=ON"
   ] ++ stdenv.lib.optionals (!z3Support) [
     "-DUSE_Z3=OFF"
+  ] ++ stdenv.lib.optionals (!cvc4Support) [
+    "-DUSE_CVC4=OFF"
   ];
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ boost ] ++ stdenv.lib.optionals z3Support [ z3 ];
+  buildInputs = [ boost ]
+    ++ stdenv.lib.optionals z3Support [ z3 ]
+    ++ stdenv.lib.optionals cvc4Support [ cvc4 cln gmp ];
   checkInputs = [ ncurses python2 ];
 
   # Test fails on darwin for unclear reason