X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=mk%2Fconfig.mk.in;h=af7dbe9c6034a0708810967925e23712c7ff600e;hb=3ab57e452b212ca2cf361841b24d67aae1860b47;hp=2ddfe828a81d4d37497de15930391f623109601b;hpb=4574f821b6c47a7a6304e76bf36f618cda06ef6d;p=ghc-hetmet.git

diff --git a/mk/config.mk.in b/mk/config.mk.in
index 2ddfe82..af7dbe9 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -56,6 +56,13 @@
 # will be built as HC files for the target system, and likely won't
 # build on this host platform.
 #
+# An important invariant is that for any piece of source code, the
+# platform on which the code is going to run is the HOST platform,
+# and the platform on which we are building is the BUILD platform.
+# Additionally for the compiler, the platform this compiler will
+# generate code for is the TARGET.  TARGET is not meaningful outside
+# the compiler sources.
+#
 # Guidelines for when to use HOST vs. TARGET:
 #
 #  - In the build system (Makefile, foo.mk), normally we should test
@@ -65,11 +72,10 @@
 #
 #  - In the compiler itself, we should test HOST or TARGET depending
 #    on whether the conditional relates to the code being generated, or
-#    the platform on which the compiler is running.  For stage 2,
-#    HOSTPLATFORM should be reset to be TARGETPLATFORM (we currently
-#    don't do this, but we should).
+#    the platform on which the compiler is running.  See the section
+#    on "Coding Style" in the commentary for more details.
 #
-#  - In the RTS and library code, we should be testing TARGET only.
+#  - In all other code, we should be testing HOST only.
 #
 # NOTE: cross-compiling is not well supported by the build system.
 # You have to do a lot of work by hand to cross compile: see the
@@ -313,8 +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@
@@ -758,12 +769,6 @@ HaveLibMingwEx	= @HaveLibMingwEx@
 HaveFrameworkHaskellSupport = @HaveFrameworkHaskellSupport@
 
 #-----------------------------------------------------------------------------
-# Regex library
-# (if present in libc use that one, otherwise use the one in the tree)
-#
-HavePosixRegex  = @HavePosixRegex@
-
-#-----------------------------------------------------------------------------
 # Flex (currently unused, could be moved to glafp-utils)
 
 # FLEX			= @LEX@