compiler: Don't create filenames starting with "./"

In the location information tables in the run-time system, source
filenames that are the same as the module name plus ".erl" extension
are not stored explicitly, thus saving memory.

To take advantage of that optimization, avoid complicating the names of
files in the current working directory; specifically, make sure that
"./" is not prepended to the name.

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index 5e4e1b0ba8..706c60caaf 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -1163,7 +1163,7 @@ path_open_first([Path|Rest], Name, Mode, LastError) ->
 	{error, _} = Error ->
 	    Error;
 	FilePath ->
-	    FileName = filename:join(FilePath, Name),
+	    FileName = fname_join(FilePath, Name),
 	    case open(FileName, Mode) of
 		{ok, Fd} ->
 		    {ok, Fd, FileName};
@@ -1176,6 +1176,11 @@ path_open_first([Path|Rest], Name, Mode, LastError) ->
 path_open_first([], _Name, _Mode, LastError) ->
     {error, LastError}.
 
+fname_join(".", Name) ->
+    Name;
+fname_join(Dir, Name) ->
+    filename:join(Dir, Name).
+
 %%%-----------------------------------------------------------------
 %%% Utility functions.