[GHC] #6063: GHC's build-time ld-flag checks are problematic

[GHC]

#6063: GHC's build-time ld-flag checks are problematic
---------------------------------+------------------------------------------
    Reporter:  parcs             |       Owner:                         
        Type:  bug               |      Status:  new                    
    Priority:  high              |   Milestone:  7.8.1                  
   Component:  Compiler          |     Version:  7.4.1                  
    Keywords:                    |          Os:  Linux                  
Architecture:  Unknown/Multiple  |     Failure:  GHC doesn't work at all
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:  #4862             |  
---------------------------------+------------------------------------------

Comment(by ezyang):

 On the other hand, having to shell out to ld every time we run GHC is a
 bit of a bummer, as far as performance goes. A stop-gap may be to just re-
 run ld without the lfags if it fails the first time; in the good case, we
 still manage to only do one invocation.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6063#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler