Cleaning a bit what I commited about llvm, and making dragonegg build.

If passing to gcc4.5 the compile flag: "-fplugin=dragonegg.so" it will use the llvm optimizers and
code generators.

In that previous commit I enabled link time optimization and plugin support in gcc 4.5.0

svn path=/nixpkgs/trunk/; revision=22235

pkgs/development/compilers/llvm/default.nix

@@ -1,4 +1,4 @@
-{stdenv, fetchurl, gcc, flex, perl, libtool, groff }:
+{stdenv, fetchurl, gcc, flex, perl, libtool, groff}:
 
 stdenv.mkDerivation {
   name = "llvm-2.7";
@@ -8,4 +8,11 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [ gcc flex perl libtool groff ];
+
+  meta = {
+    homepage = http://llvm.org/;
+    description = "Collection of modular and reusable compiler and toolchain technologies";
+    maintainers = with stdenv.lib.maintainers; [viric];
+    platforms = with stdenv.lib.platforms; all;
+  };
 }

pkgs/development/libraries/dragonegg/default.nix

@@ -1,15 +1,29 @@
-{stdenv, fetchsvn, llvm}:
+{stdenv, fetchsvn, llvm, gmp, mpfr, mpc}:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "dragonegg-2.7";
 
-  GCC = "gcc";
-
-  buildInputs = [ llvm ];
-
   src = fetchsvn {
     url = http://llvm.org/svn/llvm-project/dragonegg/branches/release_27;
     rev = 105882;
     sha256 = "0j0mj3zm1nd8kaj3b28b3w2dlzc1xbywq4mcdxk5nq4yds6rx5np";
   };
+
+  # The gcc the plugin will be built for (the same used building dragonegg)
+  GCC = "gcc";
+
+  buildInputs = [ llvm gmp mpfr mpc ];
+
+  installPhase = ''
+    ensureDir $out/lib $out/share/doc/${name}
+    cp -d dragonegg.so $out/lib
+    cp README COPYING $out/share/doc/${name}
+  '';
+
+  meta = {
+    homepage = http://dragonegg.llvm.org/;
+    description = "gcc plugin that replaces gcc's optimizers and code generators by those in LLVM";
+    maintainers = with stdenv.lib.maintainers; [viric];
+    platforms = with stdenv.lib.platforms; all;
+  };
 }

pkgs/top-level/all-packages.nix

@@ -3710,7 +3710,7 @@ let
   };
 
   dragonegg = import ../development/libraries/dragonegg {
-    inherit fetchsvn llvm;
+    inherit fetchsvn llvm gmp mpfr mpc;
     stdenv = overrideGCC stdenv gcc45;
   };