Commits on Feb 16, 2017

1. [rustbuild] add a way to run command after failure …

   This is a simple way to workaround the debugging issues caused by the rustc
   wrapper used in the bootstrap process. Namely, it uses some obscure environment
   variables and you can’t just copy the failed command and run it in the shell or
   debugger to examine the failure more closely.
   
   With `--on-fail` its possible to run an arbitrary command within exactly the
   same environment under which rustc failed. Theres’s multiple ways to use this
   new flag:
   
   $ python x.py build --stage=1 --on-fail=env
   
       would print a list of environment variables and the failed command, so a
       few copy-pastes and you now can run the same rust in your shell outside the
       bootstrap system.
   
   $ python x.py build --stage=1 --on-fail=bash
   
       Is a more useful variation of the command above in that it launches a whole
       shell with environment already in place! All that’s left to do is copy-paste
       the command just above the shell prompt!
   
   Fixes rust-lang#38686
   Fixes rust-lang#38221

   

   nagisa committed Feb 16, 2017
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