Commits on Mar 1, 2018

1. rustc: More stable hashes of command line arguments …

   Currently rustc isn't always the best at producing deterministic builds of a
   crate when the source directory of a crate is changed. This is happening due to
   what appears two different sources:
   
   * First the `-L` paths passed to rustc are hashed into the crate hash. These
     paths through Cargo are typically absolute paths that can vary if the build
     directory changes.
   
   * Next the paths passed to `--extern` are also hashed which like `-L` can change
     if the build directory changes.
   
   This commit fixes these two sources of nondeterminism by ensuring that avoiding
   tracking the hashes of these arguments on the command line. For `-L` paths
   they're either related to loading crates (whose hashes are tracked elsewhere) or
   native librarise used in the linking phase (which isn't incremental). The
   `--extern` paths are similar in that they're related to crate resolution which
   is already tracked independently of the command line arguments.
   
   Closes rust-lang#48019

   

   alexcrichton committed Mar 1, 2018
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