id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3326	the recompilation checker should take CPP flags into account	bkomuves		"The C preprocessor can be used (or maybe abused) to provide different configurations of the same program. I often build programs with a command like

{{{ghc --make -DOPTION1 -DOPTION3 main.hs}}}

Now if I try to rebuild with different CPP flags, ghc won't recompile anything, since no source file changed (however, they become different after the CPP pass).

Ticket #437 is loosely related. "	bug	closed	normal	7.2.1	Compiler	6.10.1	duplicate			Unknown/Multiple	Unknown/Multiple	None/Unknown	Unknown