Commits on Mar 10, 2017

1. rustc: Support auto-retry linking on a segfault …

   This is a last-ditch attempt to help our pain with dealing with rust-lang#38878 on the
   bots. A new environment variable is added to the compiler,
   `RUSTC_RETRY_LINKER_ON_SEGFAULT`, which will instruct the compiler to
   automatically retry the final linker invocation if it looks like the linker
   segfaulted (up to 2 extra times).
   
   Unfortunately there have been no successful attempts to debug rust-lang#38878. The only
   information seems to be that the linker (e.g. `ld` on OSX) is segfaulting
   somewhere in some thread pool implementation. This appears to be spurious as
   failed PRs will later merge.
   
   The hope is that this helps the queue keep moving without clogging and delaying
   PRs due to rust-lang#38878.

   

   alexcrichton committed Mar 10, 2017
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