Michael Snoyman authored Aug 18, 2015 and Ben Gamari committed Oct 22, 2015

When the Windows codepage or *nix LANG variable is something besides
UTF-8, dumping to file can cause GHC to exit currently. This changes the
output encoding for files to match the defined input encoding for
Haskell source code (UTF-8), making it easier for users and build tools
to capture this output.

Test Plan:
Create a Haskell source file with non-Latin characters for identifier
names and
compile with:

LANG=C ghc -ddump-to-file -ddump-hi filename.hs -fforce-recomp

Without this patch, it will fail. With this patch, it succeeds

Reviewers: austin, rwbarton, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1151

GHC Trac Issues: #10762