X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=mk%2Fconfig.mk.in;h=af7dbe9c6034a0708810967925e23712c7ff600e;hb=3ab57e452b212ca2cf361841b24d67aae1860b47;hp=1a8dc38b98089405304cc95c2bbf9da84ee3ab6b;hpb=fe1207fa2b3d8c58f63c2fcc5edaaa08d34a0c3a;p=ghc-hetmet.git

diff --git a/mk/config.mk.in b/mk/config.mk.in
index 1a8dc38..af7dbe9 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -319,8 +319,13 @@ endif
 #
 # 	-O is pretty desirable, otherwise no inlining of prelude
 #		things (incl "+") happens when compiling with this compiler
+#
+#	-fgenerics switches on generation of support code for 
+#		derivable type classes.  This is now off by default,
+#		but we switch it on for the libraries so that we generate
+#		the code in case someone importing wants it
 
-GhcLibHcOpts=-O -Rghc-timing
+GhcLibHcOpts=-O -Rghc-timing -fgenerics
 
 # Win32 only: Enable the RTS and libraries to be built as DLLs
 DLLized=@EnableWin32DLLs@