X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fiface%2FMkIface.lhs;h=e569c4756f0865645ed76dfc5086ce061f360f8c;hb=362e638ed31492d936a7039d90dc8d1db286944c;hp=b11c1e0f48219f005b345b98f589d775fc79dcc2;hpb=c004ec62b41aa2137b5b5e298ca562609b0de92e;p=ghc-hetmet.git

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index b11c1e0..e569c47 100644
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -131,7 +131,7 @@ We produce a line for every module B below the module, A, currently being
 compiled:
 	import B <n> ;
 to record the fact that A does import B indirectly.  This is used to decide
-to look to look for B.hi rather than B.hi-boot when compiling a module that
+to look for B.hi rather than B.hi-boot when compiling a module that
 imports A.  This line says that A imports B, but uses nothing in it.
 So we'll get an early bale-out when compiling A if B's version changes.
 
@@ -181,6 +181,10 @@ code of A, and thereby haul in all the stuff reachable from it.
 haul in all the unfoldings for B, in case the module that imports A *is*
 compiled with -O.  I think this is the case.]
 
+SimonM [30/11/2007]: I believe the above is all out of date; the
+current implementation doesn't do it this way.  Instead, when any of
+the dependencies of a declaration changes, the version of the
+declaration itself changes.
 
 \begin{code}
 #include "HsVersions.h"
@@ -409,7 +413,7 @@ mkIface_ hsc_env maybe_old_iface
 			mi_fix_fn = mkIfaceFixCache fixities }
 
 		-- Add version information
-              ; ext_ver_fn = mkParentVerFun hsc_env eps
+                ; ext_ver_fn = mkParentVerFun hsc_env eps
 		; (new_iface, no_change_at_all, pp_diffs, pp_orphs) 
 			= {-# SCC "versioninfo" #-}
 			 addVersionInfo ext_ver_fn maybe_old_iface
@@ -704,6 +708,8 @@ computeChangedOccs ver_fn this_module old_usages eq_info
     -- return True if an external name has changed
     name_changed :: Name -> Bool
     name_changed nm
+	| isWiredInName nm	-- Wired-in things don't get into interface
+	= False			-- files and hence don't get into the ver_fn
         | Just ents <- lookupUFM usg_modmap (moduleName mod),
           Just v    <- lookupUFM ents parent_occ
         = v < new_version