re PR debug/82933 (valgrind error in set_cur_line_info_table with -g)

	PR debug/82933
	* run-rtl-passes.c: Include debug.h.
	(run_rtl_passes): Call debug_hooks->assembly_start.
	* dwarf2out.c (dwarf2out_assembly_start): Return early if invoked
	multiple times.

	* gcc.dg/rtl/x86_64/pr82933.c: New test.

From-SVN: r254987

gcc/ChangeLog

 2017-11-21  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/82933
+	* run-rtl-passes.c: Include debug.h.
+	(run_rtl_passes): Call debug_hooks->assembly_start.
+	* dwarf2out.c (dwarf2out_assembly_start): Return early if invoked
+	multiple times.
+
 	PR target/82981
 	* internal-fn.c (expand_mul_overflow): Use OPTAB_WIDEN instead of
 	OPTAB_DIRECT in calls to expand_simple_binop.

gcc/dwarf2out.c

@@ -27507,6 +27507,9 @@ dwarf2out_init (const char *filename ATTRIBUTE_UNUSED)
 static void
 dwarf2out_assembly_start (void)
 {
+  if (text_section_line_info)
+    return;
+
 #ifndef DWARF2_LINENO_DEBUGGING_INFO
   ASM_GENERATE_INTERNAL_LABEL (text_section_label, TEXT_SECTION_LABEL, 0);
   ASM_GENERATE_INTERNAL_LABEL (text_end_label, TEXT_END_LABEL, 0);

gcc/run-rtl-passes.c

@@ -30,6 +30,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "bitmap.h"
 #include "df.h"
 #include "regs.h"
+#include "debug.h" /* for debug_hooks.  */
 #include "insn-attr-common.h" /* for INSN_SCHEDULING.  */
 #include "insn-attr.h" /* for init_sched_attrs.  */
 #include "run-rtl-passes.h"
@@ -43,6 +44,9 @@ run_rtl_passes (char *initial_pass_name)
   cfun->pass_startwith = initial_pass_name;
   max_regno = max_reg_num ();
 
+  /* cgraphunit.c normally handles this.  */
+  (*debug_hooks->assembly_start) ();
+
   /* Pass "expand" normally sets this up.  */
 #ifdef INSN_SCHEDULING
   init_sched_attrs ();

gcc/testsuite/ChangeLog

+2017-11-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/82933
+	* gcc.dg/rtl/x86_64/pr82933.c: New test.
+
 2017-11-20  Eric Gallager  <egall@gwmail.gwu.edu>
 
 	PR preprocessor/81794

gcc/testsuite/gcc.dg/rtl/x86_64/pr82933.c

+/* { dg-do run { target { { i?86-*-* x86_64-*-* } && lp64 } } } */
+/* { dg-options "-g" } */
+
+#include "into-cfglayout.c"