Give the DLL loader awareness of rpaths

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

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.

Trac metadata

Trac field	Value
Version	7.8.4
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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