[GHC] #7465: ./configure --with--ffi-libraries: ld cannot find libffi in a non-standard location

[GHC]

#7465: ./configure --with--ffi-libraries: ld cannot find libffi in a non-standard
location
--------------------------------+-------------------------------------------
Reporter:  trommler             |          Owner:  trommler        
    Type:  bug                  |         Status:  patch           
Priority:  normal               |      Component:  Build System    
 Version:  7.7                  |       Keywords:                  
      Os:  Linux                |   Architecture:  Unknown/Multiple
 Failure:  Building GHC failed  |      Blockedby:                  
Blocking:                       |        Related:  #5743           
--------------------------------+-------------------------------------------
Changes (by trommler):

  * status:  new => patch


Comment:

 attachment:0001-Record-libffi-directory-in-rts-package-conf-cf.-7465.patch
 adds a {{{library-dirs}}} entry to rts package conf. This is necessary
 because {{{--with-system-libffi}}} libffi is an external library that
 needs to be linked with too.

 attachment:0002-Add-L-flags-to-libs.depend-fixes-7465.patch adds -L flags
 for all {{{library-dirs}}} to {{{libs.depend}}} so libffi and other
 libraries (e.g. PAPI) can be found when those libraries are installed in
 directories that are not on the linker path.

 As I had quite long paths {{{ghc-pkg}}} decided to add newlines, so I had
 to get rid of those first using {{{tr}}}. I wonder if that could also be
 an issue for computing the -l flags if there were more libraries than fit
 on one line.

 The regexp in the second {{{sed}}} command does not handle spaces in
 directory names correctly, but I feel that won't be an issue on most Linux
 installations. If you disagree please let me know what you want me to do.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7465#comment:1>
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