[GHC] #3104: -main-is should be a link time option, not compile time

[GHC]

#3104: -main-is should be a link time option, not compile time
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Reporter:  NeilMitchell      |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  6.10.1            |       Severity:  normal          
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 The {{{-main-is}}} flag specifies which function name to use as main.
 However, when doing separate compilation:

 {{{
 ghc -c Foo.hs
 ghc Foo.o
 }}}

 You have to give the {{{-main-is}}} in the first step - the compilation,
 rather than in the second step, the linking. It feels like this flag
 should be a link time option, and would give greater flexibility allowing
 one object file to be used in multiple projects with different main
 commands.

 If you compile with {{{ghc --make}}} this issue isn't really a problem.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3104>
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