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This both says what we mean and silences a bunch of spurious CPP linting
warnings. This pragma is supported by all CPP implementations which we
support.
Reviewers: austin, erikd, simonmar, hvr
Reviewed By: simonmar
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3482
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Before, we detecting the presence of MinTTY on Windows in a very
imprecise way: by checking if the `_` environment variable was set. Not
only is this easy to circumvent, but it also yields false positives on
terminals like ConEmu.
This changes the test to use the `GetFileInformationByHandleEx` function
instead, which provides a far more accurate check for MinTTY's presence.
I've tested this on PowerShell, MSYS2, Cygwin, ConEmu, and Git Bash, and
it does the right thing on each one.
Fixes #12958.
Test Plan: Run GHCi on many different Windows and MinTTY consoles
Reviewers: erikd, Phyx, austin, bgamari
Reviewed By: Phyx, bgamari
Subscribers: thomie, #ghc_windows_task_force
Differential Revision: https://phabricator.haskell.org/D2878
GHC Trac Issues: #12958
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