From: Simon Marlow <simonmar@microsoft.com>
Date: Tue, 2 Oct 2007 11:49:17 +0000 (+0000)
Subject: mkIfaceExports: sort the children of AvailTC
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=7f10c5a6003704ba701d055e3d5cf113f46080ba

mkIfaceExports: sort the children of AvailTC
This fixes a problem with spurious recompilations: each time a module
was recompiled, the order of the children would change, causing extra
recompilation.

MERGE TO STABLE
---

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index 4ab1161..8c1b2a0 100644
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -847,7 +847,8 @@ mkIfaceExports exports
 		-- Usually just one, but see Note [Original module]
 
 	add_for_mod env mod
-	    = add_one env mod (AvailTC tc_occ names_from_mod)
+	    = add_one env mod (AvailTC tc_occ (sort names_from_mod))
+              -- NB. sort the children, we need a canonical order
 	    where
 	      names_from_mod = [nameOccName n | n <- ns, nameModule n == mod]
 \end{code}