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[commit] minor dwarf2read.c cleanups


Hi.
fyi, I committed this.

2012-12-03  Doug Evans  <dje@google.com>

	* dwarf2read.c (struct dwarf2_per_objfile): Clarify comment.
	(dw2_find_symbol_file): Delete unused local file_data.

Index: dwarf2read.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2read.c,v
retrieving revision 1.714
diff -u -p -u -p -r1.714 dwarf2read.c
--- dwarf2read.c	26 Nov 2012 15:54:29 -0000	1.714
+++ dwarf2read.c	3 Dec 2012 22:29:00 -0000
@@ -257,9 +257,12 @@ struct dwarf2_per_objfile
   struct mapped_index *index_table;
 
   /* When using index_table, this keeps track of all quick_file_names entries.
-     TUs can share line table entries with CUs or other TUs, and there can be
-     a lot more TUs than unique line tables, so we maintain a separate table
-     of all line table entries to support the sharing.  */
+     TUs typically share line table entries with a CU, so we maintain a
+     separate table of all line table entries to support the sharing.
+     Note that while there can be way more TUs than CUs, we've already
+     sorted all the TUs into "type unit groups", grouped by their
+     DW_AT_stmt_list value.  Therefore the only sharing done here is with a
+     CU and its associated TU group if there is one.  */
   htab_t quick_file_names_table;
 
   /* Set during partial symbol reading, to prevent queueing of full
@@ -3385,7 +3388,6 @@ dw2_find_symbol_file (struct objfile *ob
 {
   struct dwarf2_per_cu_data *per_cu;
   offset_type *vec;
-  struct quick_file_names *file_data;
   const char *filename;
 
   dw2_setup (objfile);


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