New parameter "debug symbol-lookup".

gdb/ChangeLog:

	New parameter "debug symbol-lookup".
	* NEWS: Mention it.
	* cp-namespace.c (cp_lookup_symbol_imports_or_template): Add debug
	output.
	(cp_lookup_symbol_namespace, cp_lookup_symbol_nonlocal): Ditto.
	(cp_lookup_nested_symbol): Ditto.
	* language.c (language_lookup_primitive_type_by_name): Add debug
	output.
	* minsyms.c (lookup_minimal_symbol): Add debug output.
	* objfiles.c (objfile_debug_name): Moved here, and renamed ...
	* symfile-debug.c (debug_objfile_name): ... from here.  All callers
	updated.
	* objfiles.h (objfile_debug_name): Declare.
	* symtab.h (symbol_lookup_debug): Declare.
	* symtab.c (symbol_lookup_debug): New global.
	(lookup_language_this): Add debug output.
	(lookup_symbol_aux, lookup_symbol_in_block): Ditto.
	(lookup_symbol_in_objfile_symtabs, lookup_symbol_via_quick_fns): Ditto.
	(lookup_symbol_in_static_block, lookup_symbol_in_objfile): Ditto.
	(_initialize_symtab): Add new parameter "debug symbol-lookup".

gdb/doc/ChangeLog:

	* gdb.texinfo (Debugging Output): Document "debug symbol-lookup".

1 files changed, 39 insertions, 2 deletions

diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 2463be441e..2a421fcf43 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -203,6 +203,14 @@ lookup_minimal_symbol (const char *name, const char *sfile,
 	     and the second over the demangled hash table.  */
         int pass;
 
+	if (symbol_lookup_debug)
+	  {
+	    fprintf_unfiltered (gdb_stdlog,
+				"lookup_minimal_symbol (%s, %s, %s)\n",
+				name, sfile != NULL ? sfile : "NULL",
+				objfile_debug_name (objfile));
+	  }
+
         for (pass = 1; pass <= 2 && found_symbol.minsym == NULL; pass++)
 	    {
             /* Select hash list according to pass.  */
@@ -282,13 +290,42 @@ lookup_minimal_symbol (const char *name, const char *sfile,
 
   /* External symbols are best.  */
   if (found_symbol.minsym != NULL)
-    return found_symbol;
+    {
+      if (symbol_lookup_debug)
+	{
+	  fprintf_unfiltered (gdb_stdlog,
+			      "lookup_minimal_symbol (...) = %s"
+			      " (external)\n",
+			      host_address_to_string (found_symbol.minsym));
+	}
+      return found_symbol;
+    }
 
   /* File-local symbols are next best.  */
   if (found_file_symbol.minsym != NULL)
-    return found_file_symbol;
+    {
+      if (symbol_lookup_debug)
+	{
+	  fprintf_unfiltered (gdb_stdlog,
+			      "lookup_minimal_symbol (...) = %s"
+			      " (file-local)\n",
+			      host_address_to_string
+			        (found_file_symbol.minsym));
+	}
+      return found_file_symbol;
+    }
 
   /* Symbols for shared library trampolines are next best.  */
+  if (symbol_lookup_debug)
+    {
+      fprintf_unfiltered (gdb_stdlog,
+			  "lookup_minimal_symbol (...) = %s%s\n",
+			  trampoline_symbol.minsym != NULL
+			  ? host_address_to_string (trampoline_symbol.minsym)
+			  : "NULL",
+			  trampoline_symbol.minsym != NULL
+			  ? " (trampoline)" : "");
+    }
   return trampoline_symbol;
 }