Adding first built version of the gnat compiler for gcc 4.4.

Some things don't work:
- The ghdl expression (it still needs the gcc 4.3.4 src, ...)
- The gnat wrappers need to be more generic - now they work only for the
  given gnatboot (taken from gentoo) and gnats installed to their $out
  store path.
- Using the cloogppl and ppl. We will need our own gnatboot built with c++
  libraries for that.


svn path=/nixpkgs/branches/stdenv-updates/; revision=19060

pkgs/development/compilers/gnatboot/default.nix

@@ -0,0 +1,50 @@
+{stdenv, fetchurl}:
+
+stdenv.mkDerivation {
+  name = "gentoo-gnatboot-4.1";
+
+  src = if (stdenv.system == "i686-linux") then
+    fetchurl {
+      url = "mirror://gentoo/distfiles/gnatboot-4.1-i386.tar.bz2";
+      sha256 = "0665zk71598204bf521vw68i5y6ccqarq9fcxsqp7ccgycb4lysr";
+    }
+    else if (stdenv.system == "x86_64-linux") then
+    fetchurl {
+      url = "mirror://gentoo/distfiles/gnatboot-4.1-amd64.tar.bz2";
+      sha256 = "1li4d52lmbnfs6llcshlbqyik2q2q4bvpir0f7n38nagp0h6j0d4";
+    } else throw "Platform not supported";
+
+  dontStrip=1;
+
+  installPhase = ''
+    ensureDir $out
+    cp -R * $out
+    cd $out/bin
+    set +e
+    for a in *; do
+      patchelf --interpreter $(cat $NIX_GCC/nix-support/dynamic-linker) \
+        --set-rpath $(cat $NIX_GCC/nix-support/orig-libc)/lib:$(cat
+        $NIX_GCC/nix-support/orig-gcc) $a
+    done
+    set -e
+    mv $out/bin/gnatgcc_2wrap $out/bin/gnatgcc
+    ln -s $out/bin/gnatgcc $out/bin/gcc
+  '';
+
+  passthru = {
+    langC = true; /* TRICK for gcc-wrapper to wrap it */
+    langCC = false;
+    langFortran = false;
+    langAda = true;
+  };
+
+  meta = {
+    homepage = http://gentoo.org;
+    license = "GPLv3+";  # runtime support libraries are typically LGPLv3+
+    maintainers = [
+      stdenv.lib.maintainers.viric
+    ];
+    
+    platforms = stdenv.lib.platforms.linux;
+  };
+}