[GHC] #10015: Give the DLL loader awareness of rpaths

[GHC]

#10015: Give the DLL loader awareness of rpaths
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              Reporter:  joelteon    |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  normal      |           Version:  7.8.4
             Component:  Compiler    |  Operating System:  MacOS X
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:  x86_64      |        Blocked By:
  (amd64)                            |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 This is nix-related. I'm trying to build with the nix version of libiconv
 instead of system libiconv, and to facilitate this I'm running package
 builds in a sandbox.

 If I try to compile a module using TemplateHaskell, say

 {{{#!hs
 module Main where

 main :: IO ()
 main = putStrLn $([|"Hello, world!"|])
 }}}

 I get this from ghc --make:

 [1 of 1] Compiling Main             ( main.hs, main.o )
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... <command line>: can't load .so/.DLL for:
 libiconv.dylib (dlopen(libiconv.dylib, 9): no suitable image found.  Did
 find:
         /usr/lib/libiconv.dylib: stat() failed with errno=1)

 When of course I'd rather it just try to dlopen /nix/store
 /lsvxsyw9w17d2rix740akjxyxcacgi3k-libiconv-41/lib/libiconv.dylib, the one
 it was built with.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10015>
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