re PR debug/49364 ([4.7 regressions] Empty .debug_abbrev sections confuse SGI nm)

	PR debug/49364
	* dwarf2out.c (output_abbrev_section): Don't return early
	if abbrev_die_table_in_use is 1.
	(dwarf2out_finish): Instead don't call output_abbrev_section
	nor emit abbrev_section_label in that case.

From-SVN: r175694

gcc/ChangeLog

+2011-06-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/49364
+	* dwarf2out.c (output_abbrev_section): Don't return early
+	if abbrev_die_table_in_use is 1.
+	(dwarf2out_finish): Instead don't call output_abbrev_section
+	nor emit abbrev_section_label in that case.
+
 2011-06-30  Nick Clifton  <nickc@redhat.com>
 
 	* config/v850/v850.h (CPP_SPEC): Define __v850e__ when compiling

gcc/dwarf2out.c

@@ -11358,9 +11358,6 @@ output_abbrev_section (void)
 {
   unsigned long abbrev_id;
 
-  if (abbrev_die_table_in_use == 1)
-    return;
-
   for (abbrev_id = 1; abbrev_id < abbrev_die_table_in_use; ++abbrev_id)
     {
       dw_die_ref abbrev = abbrev_die_table[abbrev_id];
@@ -25226,9 +25223,12 @@ dwarf2out_finish (const char *filename)
   output_comp_unit (comp_unit_die (), debug_info_level >= DINFO_LEVEL_VERBOSE);
 
   /* Output the abbreviation table.  */
-  switch_to_section (debug_abbrev_section);
-  ASM_OUTPUT_LABEL (asm_out_file, abbrev_section_label);
-  output_abbrev_section ();
+  if (abbrev_die_table_in_use != 1)
+    {
+      switch_to_section (debug_abbrev_section);
+      ASM_OUTPUT_LABEL (asm_out_file, abbrev_section_label);
+      output_abbrev_section ();
+    }
 
   /* Output location list section if necessary.  */
   if (have_location_lists)