[llvm] r272021 - [lit] Improve logging with file redirection.

[Hans Wennborg via llvm-commits]

On Tue, Jun 7, 2016 at 9:13 AM, Daniel Dunbar via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: ddunbar
> Date: Tue Jun  7 11:13:40 2016
> New Revision: 272021
>
> URL: http://llvm.org/viewvc/llvm-project?rev=272021&view=rev
> Log:
> [lit] Improve logging with file redirection.
>
>  - This will cause lit to automatically include the first 1K of data in
>    redirected output files when a command fails (previously if the command
>    failed, but the main point of the test was, say, a `FileCheck` later on, then
>    the log wasn't helpful in showing why the command failed).

This makes the test suite hang for me on 32-bit Windows builds. It
runs fine at r272019, but hangs at this revision (and also on
ToT/r272292).

I'm not sure how to debug this. It seems after a while, python.exe
just sits there waiting for something, with 1, 2, or 0 FileCheck
processes opened.