[commit: ghc] master: Add a comment (f83994e)

[Ian Lynagh]

Repository : http://darcs.haskell.org/ghc.git/

On branch  : master

https://github.com/ghc/ghc/commit/f83994ec376625591ce33861354030f3d7eb71f3

>---------------------------------------------------------------

commit f83994ec376625591ce33861354030f3d7eb71f3
Author: Ian Lynagh <ian at well-typed.com>
Date:   Sat Jun 1 19:16:56 2013 +0100

    Add a comment

>---------------------------------------------------------------

 rules/build-dependencies.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rules/build-dependencies.mk b/rules/build-dependencies.mk
index 02640bf..1233426 100644
--- a/rules/build-dependencies.mk
+++ b/rules/build-dependencies.mk
@@ -49,6 +49,10 @@ endif
 #    within the build tree. On Windows this causes a problem as they look
 #    like bad rules, due to the two colons, so we filter them out.
 	grep -v ' : [a-zA-Z]:/' $$@.tmp > $$@.tmp2
+# Insert the calls to hi-rule. Basically, we look for the
+#     Foo.dyn_o Foo.o : Foo.hs
+# lines, and create corresponding hi-rule lines
+#     $(eval $(call hi-rule,Foo.dyn_hi Foo.hi : %hi: %o Foo.hs))
 	sed '/hs$$$$/ p                                      ; \
 	     /hs$$$$/ s/o /hi /g                             ; \
 	     /hs$$$$/ s/:/ : %hi: %o /                       ; \