Check for overlap-flag differences in hi files

[ghc-hetmet.git] / compiler / iface / MkIface.lhs

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index 1e85ac4..3ff30d9 100644 (file)
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -482,7 +482,9 @@ addVersionInfo (Just old_iface@(ModIface { mi_mod_vers  = old_mod_vers,
 
     -------------------
     -- Adding version info
 
     -------------------
     -- Adding version info

-    new_version     = bumpVersion old_mod_vers
+    new_version = bumpVersion old_mod_vers     -- Start from the old module version, not from zero
+                                               -- so that if you remove f, and then add it again,
+                                               -- you don't thereby reduce f's version number

     add_vers decl | occ `elemOccSet` changed_occs = new_version
                  | otherwise = expectJust "add_vers" (old_decl_vers occ)
                                -- If it's unchanged, there jolly well 
     add_vers decl | occ `elemOccSet` changed_occs = new_version
                  | otherwise = expectJust "add_vers" (old_decl_vers occ)
                                -- If it's unchanged, there jolly well