Issue description

Currently, Darwin stdenv doesn't have reproducible builds. According to this post it looks like Clang should support reproducible builds. It looks like macOS has some special PIE/ASLR that may be contributing to this.

Does anyone have insight on what's going on? Perhaps passing --no_pie to LLVM configure will fix something?

Steps to reproduce

$ nix-build -A hello --check
...
error: derivation ‘/nix/store/cq72li3c6vs7vabnlikfrz5vmjd4syj1-hello-2.10.drv’ may not be deterministic: output ‘/nix/store/la0bdn94l74vscz7bivhvi6qg7ih3v0p-hello-2.10’ differs

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)
  macOS Sierra 10.12.2
• Nix version: (run nix-env --version)
  nix-env (Nix) 1.11.4
• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion)
  17.03pre-git