Merge branch 'pan/otp_8579_autoimport_override' into dev

* origin/pan/otp_8579_autoimport_override:
  Update preloaded modules
  Update primary bootstrap
  Remove outcommented code from erl_lint
  Make port_command/3 auto-imported
  Remove (harmless) warnings about min/max in core applications
  Autoimport min/2 and max/2
  Improve coverage of erl_int in testcases
  Change warning to error for nowarn_bif_clash compiler directive
  Add -compile({no_auto_import,[F/A]}) doc to compiler.xml
  Add some testcases to compiler to verify that overriding really happens
  Return nowarn_bif_clash functionality but with warning
  Teach erl_lint to better override BIFs with local functions and imports
  Teach compiler to override autoimport with import
  First prototype for local functions overriding autoimported

OTP-8579  Local functions should override auto-imported

Local and imported functions now override the autoimported
BIFs when the names clash. The pre R14 behaviour was that
autoimported BIFs would override local functions. To avoid
that old programs change behaviour, the following will
generate an error:

Doing a call without explicit module name to a local function
having a name clashing with the name of an autoimported BIF
that was present (and autoimported) before OTP R14A
Explicitly importing a function having a name clashing with
the name of an autoimported BIF that was present (and
autoimported) before OTP R14A Using any form of the old
compiler directive nowarn_bif_clash

If the BIF was added or autoimported in OTP R14A or later,
overriding it with an import or a local function will only
result in a warning,

To resolve clashes, you can either use the explicit module
name erlang to call the BIF, or you can remove the autoimport
of that specific BIF by using the new compiler directive
-compile({no_auto_import,[F/A]})., which makes all calls to
the local or imported function without explicit module name
pass without warnings or errors.

The change makes it possible to add autoimported BIFs without
breaking or silently changing old code in the future. However
some current code ingeniously utilizing the old behaviour or
the nowarn_bif_clash compiler directive, might need changing
to be accepted by the compiler.

1 files changed, 7 insertions, 9 deletions

diff --git a/lib/compiler/src/cerl_trees.erl b/lib/compiler/src/cerl_trees.erl
index 7a2057713e..1e3755025f 100644
--- a/lib/compiler/src/cerl_trees.erl
+++ b/lib/compiler/src/cerl_trees.erl
@@ -1,19 +1,19 @@
 %%
 %% %CopyrightBegin%
-%% 
-%% Copyright Ericsson AB 2001-2009. All Rights Reserved.
-%% 
+%%
+%% Copyright Ericsson AB 2001-2010. All Rights Reserved.
+%%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
 %% compliance with the License. You should have received a copy of the
 %% Erlang Public License along with this software. If not, it can be
 %% retrieved online at http://www.erlang.org/.
-%% 
+%%
 %% Software distributed under the License is distributed on an "AS IS"
 %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 %% the License for the specific language governing rights and limitations
 %% under the License.
-%% 
+%%
 %% %CopyrightEnd%
 
 %% @doc Basic functions on Core Erlang abstract syntax trees.
@@ -73,14 +73,12 @@ depth(T) ->
 	[] ->
 	    0;
 	Gs ->
-	    1 + lists:foldl(fun (G, A) -> max(depth_1(G), A) end, 0, Gs)
+	    1 + lists:foldl(fun (G, A) -> erlang:max(depth_1(G), A) end, 0, Gs)
     end.
 
 depth_1(Ts) ->
-    lists:foldl(fun (T, A) -> max(depth(T), A) end, 0, Ts).
+    lists:foldl(fun (T, A) -> erlang:max(depth(T), A) end, 0, Ts).
 
-max(X, Y) when X > Y -> X; 
-max(_, Y) -> Y.
 
 
 %% @spec size(Tree::cerl()) -> integer()