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

[GHC]

#5743: Configurably use system-provided libffi
------------------------------+---------------------------------------------
  Reporter:  nomeata          |          Owner:  trommler        
      Type:  feature request  |         Status:  closed          
  Priority:  normal           |      Milestone:  7.6.2           
 Component:  Build System     |        Version:  7.2.1           
Resolution:  fixed            |       Keywords:                  
        Os:  Linux            |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown     |     Difficulty:  Unknown         
  Testcase:                   |      Blockedby:                  
  Blocking:                   |        Related:  #4496           
------------------------------+---------------------------------------------
Changes (by PHO):

 * cc: pho@… (added)


Comment:

 Your patch mentions a variable `LIBFFI_LIBS`, which isn't defined
 anywhere. I think you need something like:
 {{{
 diff --git a/rts/ghc.mk b/rts/ghc.mk
 index e3c9fa6..d3638ac 100644
 --- a/rts/ghc.mk
 +++ b/rts/ghc.mk
 @@ -386,12 +386,14 @@ rts/dist/build/AutoApply_HC_OPTS += -fno-PIC -static
  endif
  endif

 -# add CFLAGS for libffi
 +# add CFLAGS and LIBS for libffi
  # ffi.h triggers prototype warnings, so disable them here:
  ifeq "$(UseSystemLibFFI)" "YES"
  LIBFFI_CFLAGS = $(addprefix -I,$(FFIIncludeDir))
 +LIBFFI_LIBS   = $(addprefix -L,$(FFILibDir)) -lffi
  else
  LIBFFI_CFLAGS =
 +LIBFFI_LIBS   = -Lrts/dist/build -lffi
  endif
  rts/Interpreter_CC_OPTS += -Wno-strict-prototypes $(LIBFFI_CFLAGS)
  rts/Adjustor_CC_OPTS    += -Wno-strict-prototypes $(LIBFFI_CFLAGS)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5743#comment:15>
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