Adding a new version of the gcc-wrapper, named gcc-wrapper2, in order not to rebuild

stdenv.

In this gcc-wrapper2 I made the ld-wrapper.sh to handle the linking with shared
objects through direct pass as ld command arguments of the absolute path to shared
objects, instead of using the -L/-l combinations.

cmake 'FindXXX.cmake' modules make a strong usage of the dynamic linking directly
passing the absolute path to the shared object to the linker, and as our wrapper did
not add any -rpath for those, writting the nix expressions for some cmake packages
resulted in a lot of tricks, compared to using this gcc-wrapper2.

This gcc-wrapper2/ld-wrapper.sh should become the gcc-wrapper/ld-wrapper in a
stdenv update.

I also updated some cmake expressions to use this gcc-wrapper2, and reduced its
tricks.

I also updated the cmake setup-hook for it to make cmake not touch any rpath decided
at build time, when running the 'make install' of makefiles created by cmake.

svn path=/nixpkgs/trunk/; revision=18885

pkgs/applications/graphics/paraview/default.nix

@@ -1,35 +1,15 @@
 { fetchurl, stdenv, cmake, qt4 }:
 
 stdenv.mkDerivation {
-  name = "paraview-3.4.0";
+  name = "paraview-3.6.1";
   src = fetchurl {
-    url = http://www.paraview.org/files/v3.4/paraview-3.4.0.tar.gz;
-    sha256 = "27544f442e957e9aa60b32c674f2dcd84fffeecc9a40071ef6e305333413187d";
+    url = http://www.paraview.org/files/v3.6/paraview-3.6.1.tar.gz;
+    sha256 = "1dh0dqbdvjagy122nbwr1gg03ck2if2aqqbvzcpkx38sz12cjh7h";
   };
 
-  patches = [ ./include-qobject.patch ];
-
-  # I added these flags to get all the rpaths right, which I guess they are
-  # taken from the qt4 sources. Not very nice.
-  cmakeFlags = "-DCMAKE_SHARED_LINKER_FLAGS=\"-Wl,-rpath,$out/lib/paraview-3.4\"" +
-    " -DCMAKE_EXE_LINKER_FLAGS=\"-Wl,-rpath,$out/lib/paraview-3.4" +
-    " -lpng12 -lSM -lICE -lXrender -lXrandr -lXcursor -lXinerama" +
-    " -lXfixes -lfreetype -lfontconfig -lXext -lX11 -lssl -lXt -lz\"" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release" +
-    " -DCMAKE_INSTALL_PREFIX=$out";
-
-  dontUseCmakeConfigure = true;
-
-  # I rewrote the configure phase to get the $out references evaluated in
-  # cmakeFlags
-  configurePhase = ''
-    set -x
-    mkdir -p build;
-    cd build
-    eval -- "cmake .. $cmakeFlags"
-    set +x
-    '';
+  preConfigure = ''
+    export NIX_LDFLAGS="$NIX_LDFLAGS -rpath $out/lib/paraview-3.6"
+  '';
 
   buildInputs = [ cmake qt4 ];