DWARF: Call set_indirect_string on DW_MACINFO_start_file

Since -gsplit-dwarf -g3 will output filename as indirect string, call
set_indirect_string on DW_MACINFO_start_file for -gsplit-dwarf -g3.

gcc/

	PR debug/79342
	* dwarf2out.c (save_macinfo_strings): Call set_indirect_string
	on DW_MACINFO_start_file for -gsplit-dwarf -g3.

gcc/testsuite/

	PR debug/79342
	* gcc.dg/pr79342.: New test.

From-SVN: r263831

gcc/ChangeLog

+2018-08-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR debug/79342
+	* dwarf2out.c (save_macinfo_strings): Call set_indirect_string
+	on DW_MACINFO_start_file for -gsplit-dwarf -g3.
+
 2018-08-24  Richard Biener  <rguenther@suse.de>
 
 	* cfg.h (struct control_flow_graph): Add edge_flags_allocated and

gcc/dwarf2out.c

@@ -28287,6 +28287,12 @@ save_macinfo_strings (void)
                 && (debug_str_section->common.flags & SECTION_MERGE) != 0)
               set_indirect_string (find_AT_string (ref->info));
             break;
+	  case DW_MACINFO_start_file:
+	    /* -gsplit-dwarf -g3 will also output filename as indirect
+	       string.  */
+	    if (!dwarf_split_debug_info)
+	      break;
+	    /* Fall through. */
 	  case DW_MACRO_define_strp:
 	  case DW_MACRO_undef_strp:
             set_indirect_string (find_AT_string (ref->info));

gcc/testsuite/ChangeLog

+2018-08-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR debug/79342
+	* gcc.dg/pr79342.: New test.
+
 2018-08-23  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/87072

gcc/testsuite/gcc.dg/pr79342.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -gsplit-dwarf -g3" } */
+/* { dg-additional-options "-march=skylake -mrtm -mabm" { target x86_64-*-* i?86-*-* } } */
+
+int a;
+void b(void);
+
+void e(int *);
+int f(void);
+
+void 
+c(void)
+{
+  int d;
+  e(&d);
+  if (f())
+    b();
+}