[PATCH] Fix PR82054

[Jason Merrill]

OK.

On Thu, Aug 31, 2017 at 6:15 AM, Richard Biener <rguenther@suse.de> wrote:
>
> 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  <rguenther@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
> +  ;
> +}