#12934: Testsuite driver buffering behavior has changed with Python 3 -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Test Suite | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The buffering behavior of the testsuite driver has changed with the move to Python 3 (#9184). Now output seems to arrive at the terminal in blocks. This is strange since the documentation for `sys.stdout` in Python 3.5 claims,

When interactive, standard streams are line-buffered. Otherwise, they are block-buffered like regular text files. You can override this value with the `-u` command-line option.

It would be good to understand why this is the case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12934 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler