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Summary:
This is a fixup of https://phabricator.haskell.org/D233

The only difference is in findTFiles (first commit), which
previously broke Windows runner; now I translated literally
instead attempting to improve it, and checked it works.

Test Plan:
I used validate under 2,3 on Linux and under 2 on msys2.
On Windows I've seen a large number of failures, but they don't
seem to be connected with the patch.

Reviewers: hvr, simonmar, thomie, austin

Reviewed By: austin

Subscribers: thomie, carter, ezyang, simonmar

Differential Revision: https://phabricator.haskell.org/D310

GHC Trac Issues: #9184

This reverts commit 084d241b.

This is a possible culprit of Windows breakage reported at ghc-devs.

Summary:
Most of the changes is adaptation of old Python 2 only code.
My priority was not breaking Python 2, and so I avoided bigger
changes to the driver. In particular, under Python 3 the output
is a str and buffering cannot be disabled.

To test, define PYTHON=python3 in testsuite/mk/boilerplate.mk.

Thanks to aspidites <emarshall85@gmail.com> who provided the initial patch.

Test Plan: validate under 2 and 3

Reviewers: hvr, simonmar, thomie, austin

Reviewed By: thomie, austin

Subscribers: aspidites, thomie, simonmar, ezyang, carter

Differential Revision: https://phabricator.haskell.org/D233

GHC Trac Issues: #9184

Signed-off-by: Austin Seipp <austin@well-typed.com>

The driver now also supports nested lists of setup functions

We now use pre_cmd rather than cmd_prefix wherever possible.
Also, pass "-s --no-print-directory" whenever we use pre_cmd.

We were parsing "staticfoo" as "static foo".

This tests that the header given in the CTYPE pragma is handled.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>