[PATCH] Fix PR82054

[Richard Biener]

I am testing the following patch to fix another fallout of the
assert that we dont' add duplicated dwarf attributes.

LTO bootstrapped / bootstrapped on x86_64-unknown-linux-gnu, testing
in progress.

Richard.

2017-08-31  Richard Biener  <rguent...@suse.de>

        PR middle-end/82054
        * dwarf2out.c (dwarf2out_early_global_decl): Process each
        function only once.

        * g++.dg/gomp/pr82054.C: New testcase.

Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c     (revision 251553)
+++ gcc/dwarf2out.c     (working copy)
@@ -25492,9 +25492,10 @@ dwarf2out_early_global_decl (tree decl)
   if (TREE_CODE (decl) != TYPE_DECL
       && TREE_CODE (decl) != PARM_DECL)
     {
-      tree save_fndecl = current_function_decl;
       if (TREE_CODE (decl) == FUNCTION_DECL)
        {
+         tree save_fndecl = current_function_decl;
+
          /* For nested functions, make sure we have DIEs for the parents first
             so that all nested DIEs are generated at the proper scope in the
             first shot.  */
@@ -25521,11 +25522,19 @@ dwarf2out_early_global_decl (tree decl)
              dwarf2out_decl (origin);
            }
 
-         current_function_decl = decl;
+         /* Emit the DIE for decl but avoid doing that multiple times.  */
+         dw_die_ref old_die;
+         if ((old_die = lookup_decl_die (decl)) == NULL
+             || is_declaration_die (old_die))
+           {
+             current_function_decl = decl;
+             dwarf2out_decl (decl);
+           }
+
+         current_function_decl = save_fndecl;
        }
-      dwarf2out_decl (decl);
-      if (TREE_CODE (decl) == FUNCTION_DECL)
-       current_function_decl = save_fndecl;
+      else
+       dwarf2out_decl (decl);
     }
   symtab->global_info_ready = save;
 }
Index: gcc/testsuite/g++.dg/gomp/pr82054.C
===================================================================
--- gcc/testsuite/g++.dg/gomp/pr82054.C (revision 0)
+++ gcc/testsuite/g++.dg/gomp/pr82054.C (working copy)
@@ -0,0 +1,13 @@
+// { dg-do compile }
+// { dg-additional-options "-g" }
+
+class a
+{
+  bool b ();
+};
+bool
+a::b ()
+{
+#pragma omp parallel
+  ;
+}