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/applications/science/misc/openmodelica/mkderivation/default.nix

@@ -0,0 +1,101 @@
+# mkOpenModelicaDerivation is an mkDerivation function for packages
+# from OpenModelica suite.
+
+{ stdenv, lib, fetchgit, autoconf, automake, libtool, cmake, autoreconfHook, symlinkJoin }:
+pkg:
+let
+  inherit (builtins) hasAttr getAttr length elemAt;
+  inherit (lib) attrByPath concatStringsSep;
+
+
+  # A few helpers functions:
+
+  # getAttrDef is just a getAttr with default fallback
+  getAttrDef = attr: default: x: attrByPath [ attr ] default x;
+
+  # getAttr-like helper for optional append to string:
+  # "Hello" + appendByAttr "a" " " {a = "world";} = "Hello world"
+  # "Hello" + appendByAttr "a" " " {} = "Hello"
+  appendByAttr = attr: sep: x: if hasAttr attr x then sep + (getAttr attr x) else "";
+
+  # Are there any OM dependencies at all?
+  ifDeps = length pkg.omdeps != 0;
+
+  # Dependencies of current OpenModelica-target joined in one file tree.
+  # Return the dep itself in case it is a single one.
+  joinedDeps =
+    if length pkg.omdeps == 1
+    then elemAt pkg.omdeps 0
+    else
+      symlinkJoin {
+        name = pkg.pname + "-omhome";
+        paths = pkg.omdeps;
+      };
+
+  # Should we run ./configure for the target pkg?
+  omautoconf = getAttrDef "omautoconf" false pkg;
+
+  # Name of the make target
+  omtarget = getAttrDef "omtarget" pkg.pname pkg;
+
+  # Directory of target sources
+  omdir = getAttrDef "omdir" pkg.pname pkg;
+
+  # Simple to to m4 configuration scripts
+  postPatch = lib.optionalString ifDeps ''
+    sed -i ''$(find -name omhome.m4) -e 's|if test ! -z "$USINGPRESETBUILDDIR"|if test ! -z "$USINGPRESETBUILDDIR" -a -z "$OMHOME"|'
+  '' +
+  appendByAttr "postPatch" "\n" pkg;
+
+  # Update shebangs in the scripts before running configuration.
+  preAutoreconf = "patchShebangs --build common" +
+    appendByAttr "preAutoreconf" "\n" pkg;
+
+  # Tell OpenModelica where built dependencies are located.
+  configureFlags = lib.optional ifDeps "--with-openmodelicahome=${joinedDeps}" ++
+    getAttrDef "configureFlags" [ ] pkg;
+
+  # Our own configurePhase that accounts for omautoconf
+  configurePhase = ''
+    runHook preConfigure
+    export configureFlags="''${configureFlags} --with-ombuilddir=$PWD/build --prefix=$prefix"
+    ./configure --no-recursion $configureFlags
+    ${lib.optionalString omautoconf "(cd ${omdir}; ./configure $configureFlags)"}
+    runHook postConfigure
+  '';
+
+  # Targets that we want to build ourselves:
+  deptargets = lib.forEach pkg.omdeps (dep: dep.omtarget);
+
+  # ... so we ask openmodelica makefile to skip those targets.
+  preBuild = ''
+    for target in ${concatStringsSep " " deptargets}; do
+      touch ''${target}.skip;
+    done
+  '' +
+  appendByAttr "preBuild" "\n" pkg;
+
+  makeFlags = "${omtarget}" +
+    appendByAttr "makeFlags" " " pkg;
+
+  installFlags = "-i " +
+    appendByAttr "installFlags" " " pkg;
+
+
+in
+stdenv.mkDerivation (pkg // {
+  inherit omtarget postPatch preAutoreconf configureFlags configurePhase preBuild makeFlags installFlags;
+
+  src = fetchgit (import ./src-main.nix);
+  version = "1.18.0";
+
+  nativeBuildInputs = getAttrDef "nativeBuildInputs" [ ] pkg
+    ++ [ autoconf automake libtool cmake autoreconfHook ];
+
+  buildInputs = getAttrDef "buildInputs" [ ] pkg
+    ++ lib.optional ifDeps joinedDeps;
+
+  dontUseCmakeConfigure = true;
+
+  hardeningDisable = [ "format" ];
+})