[GHC] #5743: Configurably use system-provided libffi

[GHC]

#5743: Configurably use system-provided libffi
------------------------------+---------------------------------------------
  Reporter:  nomeata          |          Owner:  trommler        
      Type:  feature request  |         Status:  patch           
  Priority:  normal           |      Milestone:  7.6.2           
 Component:  Build System     |        Version:  7.7             
Resolution:                   |       Keywords:                  
        Os:  Linux            |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown     |     Difficulty:  Unknown         
  Testcase:                   |      Blockedby:                  
  Blocking:                   |        Related:  #4496           
------------------------------+---------------------------------------------

Comment(by PHO):

 Replying to [comment:16 trommler]:
 > In the case of {{{UseSystemLibFFI=="YES"}}} the correct linker flags
 will be set as part of {{{rts/libs.depend}}}, hence the empty definition
 for {{{LIBFFI_LIBS}}}.

 I get it. But then what about {{{FFILibDir}}}? If I understand this
 correctly, {{{rts/libs.depend}}} contains only {{{-l}}} flags so
 {{{-L$(FFILibDir)}}} won't be passed to the linker.

 Apart from that, {{{$(rts_LD_OPTS)}}} seems to be ignored too. Or am I
 missing some point?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5743#comment:19>
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