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/tools/build-managers/gprbuild/boot.nix

@@ -0,0 +1,90 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+, gnat
+, which
+, xmlada # for src
+}:
+
+let
+  version = "22.0.0";
+
+  gprConfigKbSrc = fetchFromGitHub {
+    name = "gprconfig-kb-${version}-src";
+    owner = "AdaCore";
+    repo = "gprconfig_kb";
+    rev = "v${version}";
+    sha256 = "0zvd0v5cz0zd1hfnhdd91c6sr3bbv1w715j2gvzx3vxlpx1c2q4n";
+  };
+in
+
+stdenv.mkDerivation {
+  pname = "gprbuild-boot";
+  inherit version;
+
+  src = fetchFromGitHub {
+    name = "gprbuild-${version}";
+    owner = "AdaCore";
+    repo = "gprbuild";
+    rev = "v${version}";
+    sha256 = "0rv0ha0kxzab5hhv0jzkjkmchhlvlx8fci8xalnngrgb9nd4r3v8";
+  };
+
+  nativeBuildInputs = [
+    gnat
+    which
+  ];
+
+  postPatch = ''
+    # The Makefile uses gprbuild to build gprbuild which
+    # we can't do at this point, delete it to prevent the
+    # default phases from failing.
+    rm Makefile
+
+    # make sure bootstrap script runs
+    patchShebangs --build bootstrap.sh
+  '';
+
+  # This setupHook populates GPR_PROJECT_PATH which is used by
+  # gprbuild to find dependencies. It works quite similar to
+  # the pkg-config setupHook in the sense that it also splits
+  # dependencies into GPR_PROJECT_PATH and GPR_PROJECT_PATH_FOR_BUILD,
+  # but gprbuild itself doesn't support this, so we'll need to
+  # introducing a wrapper for it in the future remains TODO.
+  # For the moment this doesn't matter since we have no situation
+  # were gprbuild is used to build something used at build time.
+  setupHook = ./gpr-project-path-hook.sh;
+
+  installPhase = ''
+    runHook preInstall
+
+    ./bootstrap.sh \
+      --with-xmlada=${xmlada.src} \
+      --with-kb=${gprConfigKbSrc} \
+      --prefix=$out
+
+    # Install custom compiler description which can detect nixpkgs'
+    # GNAT wrapper as a proper Ada compiler. The default compiler
+    # description expects the runtime library to be installed in
+    # the same prefix which isn't the case for nixpkgs. As a
+    # result, it would detect the unwrapped GNAT as a proper
+    # compiler which is unable to produce working binaries.
+    #
+    # Our compiler description is very similar to the upstream
+    # GNAT description except that we use a symlink in $out/nix-support
+    # created by the cc-wrapper to find the associated runtime
+    # libraries and use gnatmake instead of gnatls to find GNAT's
+    # bin directory.
+    install -m644 ${./nixpkgs-gnat.xml} $out/share/gprconfig/nixpkgs-gnat.xml
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Multi-language extensible build tool";
+    homepage = "https://github.com/AdaCore/gprbuild";
+    license = licenses.gpl3Plus;
+    maintainers = [ maintainers.sternenseemann ];
+    platforms = platforms.all;
+  };
+}

pkgs/development/tools/build-managers/gprbuild/default.nix

@@ -0,0 +1,65 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, fetchpatch
+, gprbuild-boot
+, which
+, gnat
+, xmlada
+}:
+
+stdenv.mkDerivation {
+  pname = "gprbuild";
+
+  # See ./boot.nix for an explanation of the gprbuild setupHook,
+  # our custom knowledge base entry and the situation wrt a
+  # (future) gprbuild wrapper.
+  inherit (gprbuild-boot)
+    version
+    src
+    setupHook
+    meta
+    ;
+
+  nativeBuildInputs = [
+    gnat
+    gprbuild-boot
+    which
+  ];
+
+  propagatedBuildInputs = [
+    xmlada
+  ];
+
+  makeFlags = [
+    "ENABLE_SHARED=${if stdenv.hostPlatform.isStatic then "no" else "yes"}"
+    "PROCESSORS=$(NIX_BUILD_CORES)"
+    # confusingly, for gprbuild --target is autoconf --host
+    "TARGET=${stdenv.hostPlatform.config}"
+    "prefix=${placeholder "out"}"
+  ] ++ lib.optionals (!stdenv.hostPlatform.isStatic) [
+    "LIBRARY_TYPE=relocatable"
+  ];
+
+  # Fixes gprbuild being linked statically always
+  patches = lib.optional (!stdenv.hostPlatform.isStatic) (fetchpatch {
+    name = "gprbuild-relocatable-build.patch";
+    url = "https://aur.archlinux.org/cgit/aur.git/plain/relocatable-build.patch?h=gprbuild&id=1d4e8a5cb982e79135a0aaa3ef87654bed1fe4f0";
+    sha256 = "1r3xsp1pk9h666mm8mdravkybmd5gv2f751x2ffb1kxnwq1rwiyn";
+  });
+
+  buildFlags = [ "all" "libgpr.build" ];
+
+  installFlags = [ "all" "libgpr.install" ];
+
+  # link gprconfig_kb db from gprbuild-boot into build dir,
+  # the install process copies its contents to $out
+  preInstall = ''
+    ln -sf ${gprbuild-boot}/share/gprconfig share/gprconfig
+  '';
+
+  # no need for the install script
+  postInstall = ''
+    rm $out/doinstall
+  '';
+}

pkgs/development/tools/build-managers/gprbuild/gpr-project-path-hook.sh

@@ -0,0 +1,8 @@
+addAdaObjectsPath() {
+    local role_post
+    getHostRoleEnvHook
+
+    addToSearchPath "GPR_PROJECT_PATH${role_post}" "$1/share/gpr"
+}
+
+addEnvHooks "$targetOffset" addAdaObjectsPath

pkgs/development/tools/build-managers/gprbuild/nixpkgs-gnat.xml

@@ -0,0 +1,56 @@
+<?xml version="1.0" ?>
+<gprconfig>
+  <!-- This differs from the default GNAT compiler description
+       in the following ways:
+
+       * gnatmake is used over gnatls to detect the GNAT version
+         since the latter is not part of the wrapper.
+       * to find the runtime libraries, we rely on the symlink
+         ../nix-support/gprconfig-gnat-unwrapped which is a
+         gprconfig-specific addition to the cc-wrapper we employ
+         for Ada compilers (which is only GNAT at the moment).
+
+       For documentation on this file format and its use refer to
+       https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug/companion_tools.html#the-gprconfig-knowledge-base
+  -->
+  <compiler_description>
+    <!-- We would like to name this something different, so users
+         of gprconfig know this is something custom, nixpkgs-related,
+         but unfortunately the knowledge base depends on the name of
+         the compiler for e. g. linker settings.
+    -->
+    <name>GNAT</name>
+    <executable prefix="1">(.*-.*-.*)?gnatmake</executable>
+    <version>
+      <external>${PREFIX}gnatmake -v</external>
+      <grep regexp="^GNATMAKE.+?(\d+(\.\d+)?)" group="1"></grep>
+    </version>
+    <languages>Ada</languages>
+    <variable name="gcc_version">
+      <external>${PREFIX}gcc -v</external>
+      <grep regexp="^[-\w]*gcc \S+ (\S+)" group="1"></grep>
+    </variable>
+    <!-- The ada runtime libraries and objects are only part of the unwrapped
+         GNAT derivation. We can't symlink them into the wrapper derivation
+         (at least not the canonical location) since that screws with linking
+         against libraries distributed with gcc.
+
+         As a workaround, we create a symlink to the unwrapped GNAT's "out"
+         output in the cc-wrapper which we can read into a variable here and
+         use to find GNAT's Ada runtime.
+    -->
+    <variable name="gnat_unwrapped">
+      <external>readlink -n ${PATH}/../nix-support/gprconfig-gnat-unwrapped</external>
+    </variable>
+    <runtimes default="default,kernel,native">
+       <directory group="default" >$gnat_unwrapped/lib/gcc(-lib)?/$TARGET/$gcc_version/adalib/</directory>
+       <directory group="default" contents="^rts-">$gnat_unwrapped/lib/gcc(-lib)?/$TARGET/$gcc_version/ada_object_path</directory>
+       <directory group="2" >$gnat_unwrapped/lib/gcc(-lib)?/$TARGET/$gcc_version/rts-(.*)/adalib/</directory>
+       <directory group="1" >$gnat_unwrapped/$TARGET/lib/gnat/(.*)/adalib/</directory>
+    </runtimes>
+    <target>
+      <external>${PREFIX}gcc -dumpmachine</external>
+      <grep regexp="[^\r\n]+"></grep>
+    </target>
+  </compiler_description>
+</gprconfig>