re PR lto/83719 (ICE (segfault) in hash_table<indirect_string_hasher, xcallocator>::elements())

2018-01-08  Richard Biener  <rguenther@suse.de>

	PR lto/83719
	* dwarf2out.c (output_indirect_strings): Handle empty
	skeleton_debug_str_hash.
	(dwarf2out_early_finish): Index strings for -gsplit-dwarf.

	* gcc.dg/lto/pr83719_0.c: New testcase.

From-SVN: r256338

gcc/ChangeLog

+2018-01-08  Richard Biener  <rguenther@suse.de>
+
+	PR lto/83719
+	* dwarf2out.c (output_indirect_strings): Handle empty
+	skeleton_debug_str_hash.
+	(dwarf2out_early_finish): Index strings for -gsplit-dwarf.
+
 2018-01-08  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.c (TARGET_TRAMPOLINE_ADJUST_ADDRESS): Delete.

gcc/dwarf2out.c

@@ -27795,8 +27795,9 @@ output_indirect_strings (void)
       unsigned int offset = 0;
       unsigned int cur_idx = 0;
 
-      skeleton_debug_str_hash->traverse<enum dwarf_form,
-					output_indirect_string> (DW_FORM_strp);
+      if (skeleton_debug_str_hash)
+        skeleton_debug_str_hash->traverse<enum dwarf_form,
+					  output_indirect_string> (DW_FORM_strp);
 
       switch_to_section (debug_str_offsets_section);
       debug_str_hash->traverse_noresize
@@ -30819,6 +30820,12 @@ dwarf2out_early_finish (const char *filename)
 
   save_macinfo_strings ();
 
+  if (dwarf_split_debug_info)
+    {
+      unsigned int index = 0;
+      debug_str_hash->traverse_noresize<unsigned int *, index_string> (&index);
+    }
+
   /* Output all of the compilation units.  We put the main one last so that
      the offsets are available to output_pubnames.  */
   for (limbo_die_node *node = limbo_die_list; node; node = node->next)

gcc/testsuite/ChangeLog

+2018-01-08  Richard Biener  <rguenther@suse.de>
+
+	PR lto/83719
+	* gcc.dg/lto/pr83719_0.c: New testcase.
+
 2018-01-08  Tom de Vries  <tom@codesourcery.com>
 
 	* gcc.dg/graphite/interchange-7.c: Add dg-require-stack-size.

gcc/testsuite/gcc.dg/lto/pr83719_0.c

+/* { dg-lto-do assemble } */
+/* { dg-lto-options { { -flto -g -gsplit-dwarf } } } */
+
+/* Empty.  */