From b2cae55fdd2b4b331bd609380b2667904d8a2eda Mon Sep 17 00:00:00 2001
From: Ian Lynagh <igloo@earth.li>
Date: Sun, 12 May 2013 16:25:08 +0100
Subject: We actually need to use -threaded/-debug when linking /all/ DLLs

Not just base, integer-gmp and ghc-prim.
---
 rules/distdir-way-opts.mk | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'rules')

diff --git a/rules/distdir-way-opts.mk b/rules/distdir-way-opts.mk
index acf68823e4..f288d3919e 100644
--- a/rules/distdir-way-opts.mk
+++ b/rules/distdir-way-opts.mk
@@ -132,6 +132,18 @@ $1_$2_$3_GHC_LD_OPTS += \
 else ifeq "$$(TargetOS_CPP)" "darwin"
 $1_$2_$3_GHC_LD_OPTS += -optl-Wl,-headerpad_max_install_names
 endif
+
+# This is a rather ugly hack to fix dynamically linked GHC on Windows.
+# If GHC is linked with -threaded, then it links against libHSrts_thr.
+# But if base is linked against libHSrts, then both end up getting
+# loaded, and things go wrong. We therefore link the libraries with the
+# same RTS flags that we link GHC with.
+ifeq "$$(GhcThreaded)" "YES"
+$1_$2_$3_GHC_LD_OPTS += -threaded
+endif
+ifeq "$$(GhcDebugged)" "YES"
+$1_$2_$3_GHC_LD_OPTS += -debug
+endif
 endif
 endif
 
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