Fix PR#5305 : prevent ocamlbuild from complaining about links to _build/

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@12452 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

Changes

@@ -98,6 +98,7 @@ Bug Fixes:
 - PR#5238, PR#5277: Sys_error when getting error location
 - PR#5295: OS threads: problem with caml_c_thread_unregister()
 - PR#5301: camlp4r and exception equal to another one with parameters
+- PR#5305: prevent ocamlbuild from complaining about links to _build/
 - PR#5309: Queue.add is not thread/signal safe
 - PR#5310: Ratio.create_ratio/create_normalized_ratio have misleading names
 - PR#5311: better message for warning 23

ocamlbuild/hygiene.ml

@@ -72,7 +72,8 @@ let check ?sanitize laws entry =
         list_collect
           begin function
             | File(path, name, _, true) ->
-                if Filename.check_suffix name suffix then
+                if Filename.check_suffix name suffix
+                  && not ( Pathname.link_to_dir (filename_concat path name) !Options.build_dir ) then
                   begin
                     remove path name;
                     Some(sf "File %s in %s has suffix %s" name path suffix)