Ticket #790 (closed bug: fixed)
Redundant re-link when ".exe" omitted
(Reported by Neil Mitchell.)
GHC 6.4.2 doesn't normally relink when invoked with --make if the target file has not changed. This is very very useful!
Create a Main.hs, and compile with ghc --make twice, first time it compiles, second time it does nothing.
Compile with ghc --make -o file.exe twice, first time it compiles, second time it does nothing.
Compile with ghc --make -o file (note the absence of .exe). First time it compiles as file.exe, second time and every time after it relinks. This is the bug. On Windows -o file means -o file.exe, and I guess the file "file" rather than "file.exe" is checked if it is up to date or not.