[GHC] #5240: help GNU ld to use less memory when linking libraries compiled with -split-objs.

[GHC]

#5240: help GNU ld to use less memory when linking libraries compiled with -split-
objs.
-------------------------------+--------------------------------------------
  Reporter:  int-e             |          Owner:  igloo           
      Type:  feature request   |         Status:  infoneeded      
  Priority:  high              |      Milestone:  7.4.1           
 Component:  Compiler          |        Version:  7.0.3           
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by pgj):

 Replying to [comment:12 igloo]:
 > Does this happen if you run [..]?

 No, it does not happen.  But let me note that it is because the "settings"
 file does not contain the "--hash-size=31" and "--reduce-memory-overheads"
 flags for the linker.

 When looking deeper into the cause, it turns out that when configuring the
 vanilla ghc bindist (7.4.2, built from sources on FreeBSD/amd64 -CURRENT)
 for installation, all those linker flag tests fail, because !LdCmd has no
 value!  (That is, the configure script gives different results for linker
 flag tests when building the compiler and when installing it!)

 However, when I use the "settings" file right from the directory where the
 compiler was originally built and the information on linker flags is not
 lost (the same happens when installing the corresponding port):

 {{{
 > ghc -c j.c
 gcc: --hash-size=31: linker input file unused because linking not done
 gcc: --reduce-memory-overheads: linker input file unused because linking
 not done
 gcc: --hash-size=31: linker input file unused because linking not done
 gcc: --reduce-memory-overheads: linker input file unused because linking
 not done
 }}}

 Is this intentional...?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5240#comment:13>
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