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Patch: warn if there are duplicate definitions of a class in an archive

This patch was written and tested some time ago, but got lost when
merging the new ABI branch into mainline.  (OK, so I forgot about it.)
Despite being in regression fixing only mode, I'd like to commit it
now.  Without it, gcj crashes if the same class is defined more than


	* jcf-parse.c (parse_zip_file_entries): Warn if we see the same
	class more than once in a jar file.

Index: jcf-parse.c
RCS file: /cvs/gcc/gcc/gcc/java/jcf-parse.c,v
retrieving revision 1.180
diff -p -2 -c -r1.180 jcf-parse.c
*** jcf-parse.c	28 Nov 2004 06:49:48 -0000	1.180
--- jcf-parse.c	6 Dec 2004 15:40:49 -0000
*************** parse_zip_file_entries (void)
*** 1371,1374 ****
--- 1371,1388 ----
  	    class = lookup_class (get_identifier (class_name));
  	    FREE (class_name);
+ 	    {
+ 	      char *class_name_in_zip_dir = ZIPDIR_FILENAME (zdir);
+ 	      tree id = get_identifier (class_name_in_zip_dir);
+ 	      if (IS_A_COMMAND_LINE_FILENAME_P (id))
+ 		{
+ 		  input_location = DECL_SOURCE_LOCATION (TYPE_NAME (class));
+ 		  warning ("%s appears more than once in this compilation", 
+ 			   class_name_in_zip_dir);
+ 		  break;
+ 		}
+ 	      IS_A_COMMAND_LINE_FILENAME_P (id) = 1;
+ 	    }
  	    current_jcf = TYPE_JCF (class);
  	    output_class = current_class = class;

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