From 9e5496e0ae0ee8f638ca93949ecca314fdb9251e Mon Sep 17 00:00:00 2001
From: Ricardo Wurmus <rekado@elephly.net>
Date: Wed, 24 Jun 2020 23:46:57 +0200
Subject: [PATCH] build-system/haskell: Configure to link with shared
 libraries.

* guix/build/haskell-build-system.scm (configure): Add configure flags to
build shared libraries by default, to generate position independent code, and
to set the RUNPATH.
---
 guix/build/haskell-build-system.scm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/guix/build/haskell-build-system.scm b/guix/build/haskell-build-system.scm
index a8cd62d03c..f57981511a 100644
--- a/guix/build/haskell-build-system.scm
+++ b/guix/build/haskell-build-system.scm
@@ -100,6 +100,12 @@ (define* (configure #:key outputs inputs tests? (configure-flags '())
                    ,@(if tests?
                          '("--enable-tests")
                          '())
+                   ;; Build and link with shared libraries
+                   "--enable-shared"
+                   "--enable-executable-dynamic"
+                   "--ghc-option=-fPIC"
+                   ,(string-append "--ghc-option=-optl=-Wl,-rpath=" (or lib out)
+                                   "/lib/$compiler/$pkg-$version")
                    ,@configure-flags)))
     ;; Cabal errors if GHC_PACKAGE_PATH is set during 'configure', so unset
     ;; and restore it.