llvm: switch back to cmake build, so now clang builds

pkgs/development/compilers/llvm/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, perl, groff, cmake, python, libffi, libcxx }:
+{ stdenv, fetchurl, perl, groff, cmake, python, libffi }:
 
 let version = "3.2"; in
 
@@ -10,32 +10,21 @@ stdenv.mkDerivation {
     sha256 = "0hv30v5l4fkgyijs56sr1pbrlzgd674pg143x7az2h37sb290l0j";
   };
 
-  preConfigure = ''
-    patchShebangs .
-    export REQUIRES_RTTI=1
-  '';
-
-  # ToDo: polly, libc++; --enable-cxx11?
-
-  configureFlags = [
-    "--enable-shared" # saves half the size, and even more for e.g. mesa
-    "--disable-assertions" "--enable-optimized"
-    "--disable-timestamps" # embedding timestamps seems a danger to purity
-    "--enable-libffi"
-    #"--enable-experimental-targets=r600"
-    #"--enable-libcpp"
-  ] ;
-
   patches = [ ./set_soname.patch ]; # http://llvm.org/bugs/show_bug.cgi?id=12334
   patchFlags = "-p0";
 
-  buildInputs = [ perl groff python ]
-    #++ [ libcxx ]
-    ;
+  preConfigure = "patchShebangs .";
+
   propagatedBuildInputs = [ libffi ];
+  buildInputs = [ perl groff cmake python ]; # ToDo: polly, libc++; enable cxx11?
+
+  # created binaries need to be run before installation... I coudn't find a better way
+  preBuild = ''export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:"`pwd`/lib'';
+
+  cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" "-DBUILD_SHARED_LIBS=ON" ];
 
   enableParallelBuilding = true;
-  #ToDo: doCheck?
+  #doCheck = true; # tests are broken, don't know why
 
   meta = {
     homepage = http://llvm.org/;