T5975a fails when using official Windows Python distribution

Using the official MSYS2 instructions:

=====> T5975a(ghci) 988 of 3859 [0, 0, 0]
cd ./ghci/scripts && touch föøbàr1.hs
cd ./ghci/scripts && HC='C:/msys64/home/Administrator/ghc/inplace/bin/ghc-stage2.exe' HC_OPTS='-dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-ghci-history ' 'C:/msys64/home/Administrator/ghc/inplace/bin/ghc-stage2.exe' --interactive -v0 -ignore-dot-ghci -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-ghci-history     <T5975a.script >T5975a.run.stdout 2>T5975a.run.stderr
Actual stderr output differs from expected:
--- /dev/null   2014-02-05 03:11:58.000000000 +0000
+++ ./ghci/scripts/T5975a.run.stderr    2014-02-05 03:11:58.103200000 +0000
@@ -0,0 +1,2 @@
+
+<no location info>: can't find file: föøbàr1.hs
*** unexpected failure for T5975a(ghci)

When we disable the cleanup hook and look at the directory listing, we see that Python has created the following file: "föøbàr1.hs". I think this is some sort of encoding problem, since we see similar behavior when running a simple Python script:

#coding=utf-8
open('föøbàr1.hs', 'w').write("")

Maybe this bug shows up in MSYS as well, but I haven't checked.

Trac metadata

Trac field	Value
Version	7.8.1-rc1
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Test Suite
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture