From: simonpj <unknown>
Date: Mon, 7 Feb 2005 12:16:52 +0000 (+0000)
Subject: [project @ 2005-02-07 12:16:50 by simonpj]
X-Git-Tag: Initial_conversion_from_CVS_complete~1103
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=3ab57e452b212ca2cf361841b24d67aae1860b47

[project @ 2005-02-07 12:16:50 by simonpj]
-----------------------------------------------------
	Switch off derivable type class generation by default
	-----------------------------------------------------

	Merge to STABLE

This commit switches off the generation of the support code for 'Derivable
Type Classes' by default.  Use -fgenerics to switch it on.

Motivation: seldom used, and there's a nasty blowup in Core types for data
types that have lots of constructors or lots of fields.

We now put -fgenerics in the GhcLibOpts, so that the libraries have the
support code, as before.
---

diff --git a/ghc/compiler/main/CmdLineOpts.lhs b/ghc/compiler/main/CmdLineOpts.lhs
index c1f8880..cf7fd7f 100644
--- a/ghc/compiler/main/CmdLineOpts.lhs
+++ b/ghc/compiler/main/CmdLineOpts.lhs
@@ -388,9 +388,6 @@ defaultDynFlags = DynFlags {
   flags = [ 
 	    Opt_ImplicitPrelude,
 	    Opt_MonomorphismRestriction,
-	    Opt_Generics,
-			-- Generating the helper-functions for
-			-- generics is now on by default
 	    Opt_Strictness,
 			-- strictness is on by default, but this only
 			-- applies to -O.
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@