Adding gdbCross, to have a gdb for other targets than native.

svn path=/nixpkgs/branches/stdenv-updates/; revision=18772

pkgs/development/tools/misc/gdb/default.nix

@@ -1,10 +1,15 @@
-{ fetchurl, stdenv, ncurses, readline, gmp, mpfr, expat, texinfo }:
+{ fetchurl, stdenv, ncurses, readline, gmp, mpfr, expat, texinfo
+, target ? null }:
 
+let
+    basename = "gdb-7.0";
+in
 stdenv.mkDerivation rec {
-  name = "gdb-7.0";
+  name = basename + stdenv.lib.optionalString (target != null)
+      ("-" + target.config);
 
   src = fetchurl {
-    url = "mirror://gnu/gdb/${name}.tar.bz2";
+    url = "mirror://gnu/gdb/${basename}.tar.bz2";
     sha256 = "1k9y271gnnvi0fny8ycydcd79snigwh88rgwi03ad782r2awcl67";
   };
 
@@ -14,7 +19,8 @@ stdenv.mkDerivation rec {
   configureFlags =
     '' --with-gmp=${gmp} --with-mpfr=${mpfr} --with-system-readline
        --with-expat --with-libexpat-prefix=${expat}
-    '';
+    '' + stdenv.lib.optionalString (target != null)
+       " --target=${target.config}";
 
   postInstall =
     '' # Remove Info files already provided by Binutils and other packages.

pkgs/top-level/all-packages.nix

@@ -2985,6 +2985,12 @@ let
     readline = readline5;
   };
 
+  gdbCross = import ../development/tools/misc/gdb {
+    inherit fetchurl stdenv ncurses gmp mpfr expat texinfo;
+    readline = readline5;
+    target = crossSystem;
+  };
+
   valgrind = import ../development/tools/analysis/valgrind {
     inherit fetchurl stdenv perl gdb;
   };