re PR target/81361 (broken exception handling at -O2)

	PR target/81361
	* dwarf2cfi.c (add_cfis_to_fde): Do not generate DW_CFA_set_loc after
	switching to a new text section.

From-SVN: r252914

gcc/ChangeLog

+2017-09-18  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR target/81361
+	* dwarf2cfi.c (add_cfis_to_fde): Do not generate DW_CFA_set_loc after
+	switching to a new text section.
+
 2017-09-18  Richard Biener  <rguenther@suse.de>
 
 	* graphite-scop-detection.c (scop_detection::stmt_has_simple_data_ref):

gcc/dwarf2cfi.c

@@ -2209,20 +2209,13 @@ add_cfis_to_fde (void)
 {
   dw_fde_ref fde = cfun->fde;
   rtx_insn *insn, *next;
-  /* We always start with a function_begin label.  */
-  bool first = false;
 
   for (insn = get_insns (); insn; insn = next)
     {
       next = NEXT_INSN (insn);
 
       if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_SWITCH_TEXT_SECTIONS)
-	{
-	  fde->dw_fde_switch_cfi_index = vec_safe_length (fde->dw_fde_cfi);
-	  /* Don't attempt to advance_loc4 between labels
-	     in different sections.  */
-	  first = true;
-	}
+	fde->dw_fde_switch_cfi_index = vec_safe_length (fde->dw_fde_cfi);
 
       if (NOTE_P (insn) && NOTE_KIND (insn) == NOTE_INSN_CFI)
 	{
@@ -2247,8 +2240,7 @@ add_cfis_to_fde (void)
 
 	      /* Set the location counter to the new label.  */
 	      xcfi = new_cfi ();
-	      xcfi->dw_cfi_opc = (first ? DW_CFA_set_loc
-				  : DW_CFA_advance_loc4);
+	      xcfi->dw_cfi_opc = DW_CFA_advance_loc4;
 	      xcfi->dw_cfi_oprnd1.dw_cfi_addr = label;
 	      vec_safe_push (fde->dw_fde_cfi, xcfi);
 
@@ -2263,7 +2255,6 @@ add_cfis_to_fde (void)
 	      insn = NEXT_INSN (insn);
 	    }
 	  while (insn != next);
-	  first = false;
 	}
     }
 }