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/libraries/ada/gnatcoll/db.nix

@@ -0,0 +1,110 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+, gnat
+, gprbuild
+, which
+, gnatcoll-core
+, xmlada
+, component
+# components built by this derivation other components depend on
+, gnatcoll-sql
+, gnatcoll-sqlite
+, gnatcoll-xref
+# component specific extra dependencies
+, gnatcoll-iconv
+, gnatcoll-readline
+, sqlite
+, postgresql
+}:
+
+let
+  libsFor = {
+    gnatcoll_db2ada = [
+      gnatcoll-sql
+    ];
+    gnatinspect = [
+      gnatcoll-sqlite
+      gnatcoll-readline
+      gnatcoll-xref
+    ];
+    postgres = [
+      gnatcoll-sql
+      postgresql
+    ];
+    sqlite = [
+      gnatcoll-sql
+      sqlite
+    ];
+    xref = [
+      gnatcoll-iconv
+      gnatcoll-sqlite
+    ];
+  };
+
+  # These components are just tools and don't install a library
+  onlyExecutable = builtins.elem component [
+    "gnatcoll_db2ada"
+    "gnatinspect"
+  ];
+in
+
+stdenv.mkDerivation rec {
+  pname = "gnatcoll-${component}";
+  version = "22.0.0";
+
+  src = fetchFromGitHub {
+    owner = "AdaCore";
+    repo = "gnatcoll-db";
+    rev = "v${version}";
+    sha256 = "1c39yg13faadg5mzpq3s83rn24npmpc4yjj0cvj7kqwpqxci4m55";
+  };
+
+  patches = lib.optionals (component == "sqlite") [
+    # fixes build of the static sqlite component
+    # when building against the system libsqlite3
+    # See https://github.com/AdaCore/gprbuild/issues/27#issuecomment-298444608
+    ./gnatcoll-db-sqlite-static-external.patch
+  ];
+
+  # Link executables dynamically unless specified by the platform,
+  # as we usually do in nixpkgs where possible
+  postPatch = lib.optionalString (!stdenv.hostPlatform.isStatic) ''
+    for f in gnatcoll_db2ada/Makefile gnatinspect/Makefile; do
+      substituteInPlace "$f" --replace "=static" "=relocatable"
+    done
+  '';
+
+  nativeBuildInputs = [
+    gnat
+    gprbuild
+    which
+  ];
+
+  # Propagate since GPRbuild needs to find referenced .gpr files
+  # and other libraries to link against when static linking is used.
+  # For executables this is of course not relevant and we can reduce
+  # the closure size dramatically
+  ${if onlyExecutable then "buildInputs" else "propagatedBuildInputs"} = [
+    gnatcoll-core
+  ] ++ libsFor."${component}" or [];
+
+  makeFlags = [
+    "-C" component
+    "PROCESSORS=$(NIX_BUILD_CORES)"
+    # confusingly, for gprbuild --target is autoconf --host
+    "TARGET=${stdenv.hostPlatform.config}"
+    "prefix=${placeholder "out"}"
+  ] ++ lib.optional (component == "sqlite") [
+    # link against packaged, not vendored libsqlite3
+    "GNATCOLL_SQLITE=external"
+  ];
+
+  meta = with lib; {
+    description = "GNAT Components Collection - Database packages";
+    homepage = "https://github.com/AdaCore/gnatcoll-db";
+    license = licenses.gpl3Plus;
+    maintainers = [ maintainers.sternenseemann ];
+    platforms = platforms.all;
+  };
+}