uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/compilers/yosys/default.nix

@@ -0,0 +1,151 @@
+{ stdenv
+, lib
+, abc-verifier
+, bash
+, bison
+, fetchFromGitHub
+, flex
+, libffi
+, makeWrapper
+, pkg-config
+, protobuf
+, python3
+, readline
+, symlinkJoin
+, tcl
+, verilog
+, zlib
+, yosys
+, yosys-bluespec
+, yosys-ghdl
+, yosys-symbiflow
+}:
+
+# NOTE: as of late 2020, yosys has switched to an automation robot that
+# automatically tags their repository Makefile with a new build number every
+# day when changes are committed. please MAKE SURE that the version number in
+# the 'version' field exactly matches the YOSYS_VER field in the Yosys
+# makefile!
+#
+# if a change in yosys isn't yet available under a build number like this (i.e.
+# it was very recently merged, within an hour), wait a few hours for the
+# automation robot to tag the new version, like so:
+#
+#     https://github.com/YosysHQ/yosys/commit/71ca9a825309635511b64b3ec40e5e5e9b6ad49b
+#
+# note that while most nix packages for "unstable versions" use a date-based
+# version scheme, synchronizing the nix package version here with the unstable
+# yosys version number helps users report better bugs upstream, and is
+# ultimately less confusing than using dates.
+
+let
+
+  # Provides a wrapper for creating a yosys with the specifed plugins preloaded
+  #
+  # Example:
+  #
+  #     my_yosys = yosys.withPlugins (with yosys.allPlugins; [
+  #        fasm
+  #        bluespec
+  #     ]);
+  withPlugins = plugins:
+    let
+      paths = lib.closePropagation plugins;
+      module_flags = with builtins; concatStringsSep " "
+        (map (n: "--add-flags -m --add-flags ${n.plugin}") plugins);
+    in lib.appendToName "with-plugins" ( symlinkJoin {
+      inherit (yosys) name;
+      paths = paths ++ [ yosys ] ;
+      buildInputs = [ makeWrapper ];
+      postBuild = ''
+        wrapProgram $out/bin/yosys \
+          --set NIX_YOSYS_PLUGIN_DIRS $out/share/yosys/plugins \
+          ${module_flags}
+      '';
+    });
+
+  allPlugins = {
+    bluespec = yosys-bluespec;
+    ghdl     = yosys-ghdl;
+  } // (yosys-symbiflow);
+
+
+in stdenv.mkDerivation rec {
+  pname   = "yosys";
+  version = "0.16";
+
+  src = fetchFromGitHub {
+    owner = "YosysHQ";
+    repo  = "yosys";
+    rev   = "${pname}-${version}";
+    hash  = "sha256-X1yygoat6ezJt9jLO+W528ryf381nKGDQ3cfrG1ZbIk=";
+  };
+
+  enableParallelBuilding = true;
+  nativeBuildInputs = [ pkg-config bison flex ];
+  buildInputs = [ tcl readline libffi python3 protobuf zlib ];
+
+  makeFlags = [ "ENABLE_PROTOBUF=1" "PREFIX=${placeholder "out"}"];
+
+  patches = [
+    ./plugin-search-dirs.patch
+    ./fix-clang-build.patch # see https://github.com/YosysHQ/yosys/issues/2011
+  ];
+
+  postPatch = ''
+    substituteInPlace ./Makefile \
+      --replace 'echo UNKNOWN' 'echo ${builtins.substring 0 10 src.rev}'
+
+    chmod +x ./misc/yosys-config.in
+    patchShebangs tests ./misc/yosys-config.in
+  '';
+
+  preBuild = let
+    shortAbcRev = builtins.substring 0 7 abc-verifier.rev;
+  in ''
+    chmod -R u+w .
+    make config-${if stdenv.cc.isClang or false then "clang" else "gcc"}
+    echo 'ABCEXTERNAL = ${abc-verifier}/bin/abc' >> Makefile.conf
+
+    # we have to do this ourselves for some reason...
+    (cd misc && ${protobuf}/bin/protoc --cpp_out ../backends/protobuf/ ./yosys.proto)
+
+    if ! grep -q "ABCREV = ${shortAbcRev}" Makefile; then
+      echo "ERROR: yosys isn't compatible with the provided abc (${shortAbcRev}), failing."
+      exit 1
+    fi
+
+    if ! grep -q "YOSYS_VER := $version" Makefile; then
+      echo "ERROR: yosys version in Makefile isn't equivalent to version of the nix package (allegedly ${version}), failing."
+      exit 1
+    fi
+  '';
+
+  checkTarget = "test";
+  doCheck = true;
+  checkInputs = [ verilog ];
+
+  # Internally, yosys knows to use the specified hardcoded ABCEXTERNAL binary.
+  # But other tools (like mcy or symbiyosys) can't know how yosys was built, so
+  # they just assume that 'yosys-abc' is available -- but it's not installed
+  # when using ABCEXTERNAL
+  #
+  # add a symlink to fake things so that both variants work the same way. this
+  # is also needed at build time for the test suite.
+  postBuild   = "ln -sfv ${abc-verifier}/bin/abc ./yosys-abc";
+  postInstall = "ln -sfv ${abc-verifier}/bin/abc $out/bin/yosys-abc";
+
+  setupHook = ./setup-hook.sh;
+
+  passthru = {
+    inherit withPlugins allPlugins;
+  };
+
+  meta = with lib; {
+    description = "Open RTL synthesis framework and tools";
+    homepage    = "https://yosyshq.net/yosys/";
+    license     = licenses.isc;
+    platforms   = platforms.all;
+    maintainers = with maintainers; [ shell thoughtpolice emily ];
+  };
+}