[GHC] #790: Redundant re-link when ".exe" omitted

#790: Redundant re-link when ".exe" omitted
-------------------------+--------------------------------------------------
    Reporter:  simonpj   |        Owner:         
        Type:  bug       |       Status:  new    
    Priority:  normal    |    Milestone:         
   Component:  Compiler  |      Version:  6.4.2  
    Severity:  normal    |     Keywords:         
          Os:  Windows   |   Difficulty:  Unknown
Architecture:  Unknown   |  
-------------------------+--------------------------------------------------
(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.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/790>
GHC <http://www.haskell.org/ghc/>
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