id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
1321	GHCi stdout bug when base package is not optimised	simonmar	simonmar	"Reported by Igloo:

The problem from a couple of weeks ago, where ghci's hFlush command
seems to be flushing a different stdout to the one that expressions
evaluated by ghci write to, happens with a ""quickest"" build:

{{{
SRC_HC_OPTS     = -H64m -Onot -fasm
GhcStage1HcOpts = -O -fasm
GhcStage2HcOpts = -Onot -fasm
GhcLibHcOpts    = -Onot -fasm
GhcLibWays      =
SplitObjs       = NO
}}}

but not if libraries are optimised:

{{{
SRC_HC_OPTS     = -H64m -Onot -fasm
GhcStage1HcOpts = -O -fasm
GhcStage2HcOpts = -Onot -fasm
GhcLibHcOpts    = -O -fasm
GhcLibWays      =
SplitObjs       = NO
}}}
ghci004 is an example of a failing test (no output is printed if
libraries are not optimised).

This seems completely illogical to me. I'd have expected such a bug
would be caused by optimisation meaning stdout gets inlined somewhere or
something. Very curious!"	bug	closed	normal	6.8.1	GHCi	6.7	fixed			Unknown/Multiple	Unknown/Multiple		Unknown