nixpkgs/pkgs/development/compilers/ghc/ghc-gold-linker.patch

From 46fe80ab7c0013a929d0934e61429820042a70a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
Date: Fri, 21 Jul 2017 20:09:11 +0200
Subject: [PATCH 1/2] base: Add `extra-libraries: m` because base uses libm
 functions.

Linking with gold needs this because in contrast to ld, gold
doesn't implicitly link libm.

Found by Michael Bishop <cleverca22@gmail.com>.
---
 libraries/base/base.cabal | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libraries/base/base.cabal b/libraries/base/base.cabal
index f00fb8768e5..fd91f268ffe 100644
--- a/libraries/base/base.cabal
+++ b/libraries/base/base.cabal
@@ -342,6 +342,10 @@ Library
         WCsubst.h
         consUtils.h
 
+    -- Base uses libm functions. ld.bfd links libm implicitly when necessary.
+    -- Other linkers, like gold, don't, so we have to declare it explicitly.
+    extra-libraries: m
+
     -- OS Specific
     if os(windows)
         -- Windows requires some extra libraries for linking because the RTS

From 900a8f4931e9bc6d3219d9263cfecfc6af8fc766 Mon Sep 17 00:00:00 2001
From: michael bishop <cleverca22@gmail.com>
Date: Sat, 22 Jul 2017 13:12:39 -0300
Subject: [PATCH 2/2] also add -lm to ghc-prim

---
 libraries/ghc-prim/ghc-prim.cabal | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libraries/ghc-prim/ghc-prim.cabal b/libraries/ghc-prim/ghc-prim.cabal
index 00a029efedf..6db85dd69fc 100644
--- a/libraries/ghc-prim/ghc-prim.cabal
+++ b/libraries/ghc-prim/ghc-prim.cabal
@@ -42,6 +42,10 @@ Library
         UnliftedFFITypes
 
     build-depends: rts == 1.0.*
+    
+    -- Base uses libm functions. ld.bfd links libm implicitly when necessary.
+    -- Other linkers, like gold, don't, so we have to declare it explicitly.
+    extra-libraries: m
 
     exposed-modules:
         GHC.CString