* A quick hack to make release.nix evaluate in a reasonable amount of   time and space on the new (non-ATerm) Nix expression evaluator.  It   turns out that release.nix relied rather heavily on maximal laziness   for efficiency: every job calls `allPackages { inherit system; }'   for each platform.  This causes the dependencies of the job to be   reevaluated for every job/platform combination.  This is very slow   and (because the evaluator doesn't have a garbage collector yet)   eventually causes the evaluator to run out of memory and be killed.
* A quick hack to make release.nix evaluate in a reasonable amount of
  time and space on the new (non-ATerm) Nix expression evaluator.  It
  turns out that release.nix relied rather heavily on maximal laziness
  for efficiency: every job calls `allPackages { inherit system; }'
  for each platform.  This causes the dependencies of the job to be
  reevaluated for every job/platform combination.  This is very slow
  and (because the evaluator doesn't have a garbage collector yet)
  eventually causes the evaluator to run out of memory and be killed.

  As a workaround, I've replaced the calls to `allPackages' with a
  quasi-memoised `pkgsFor' function.  It "caches" the result by going
  through a variable such as `pkgs_x86_64_linux', which is evaluated
  only once.  Evaluation now only takes 4.4s and 545 MiB on my
  machine.

  A cleaner solution may be to move the `system' argument outwards so
  that entire set of jobs is called only once for each value of
  `system'.

svn path=/nixpkgs/trunk/; revision=21966

NixOS/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,SymbiFlow/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,triton/triton,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,triton/triton,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,triton/triton,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,SymbiFlow/nixpkgs