Fortran] PR93309 – permit repeated 'implicit none(external)'

        PR fortran/93309
        * interface.c (gfc_procedure_use): Also check parent namespace for
        'implict none (external)'.
        * symbol.c (gfc_get_namespace): Don't set has_implicit_none_export
        to parent namespace's setting.

        PR fortran/93309
        * gfortran.dg/external_implicit_none_2.f90: New.

1 files changed, 9 insertions, 1 deletions

diff --git a/gcc/fortran/interface.c b/gcc/fortran/interface.c
index c4a6882..429abc7 100644
--- a/gcc/fortran/interface.c
+++ b/gcc/fortran/interface.c
@@ -3798,8 +3798,16 @@ gfc_procedure_use (gfc_symbol *sym, gfc_actual_arglist **ap, locus *where)
      explicitly declared at all if requested.  */
   if (sym->attr.if_source == IFSRC_UNKNOWN && !sym->attr.is_iso_c)
     {
+      bool has_implicit_none_export = false;
       implicit = true;
-      if (sym->ns->has_implicit_none_export && sym->attr.proc == PROC_UNKNOWN)
+      if (sym->attr.proc == PROC_UNKNOWN)
+	for (gfc_namespace *ns = sym->ns; ns; ns = ns->parent)
+	  if (ns->has_implicit_none_export)
+	    {
+	      has_implicit_none_export = true;
+	      break;
+	    }
+      if (has_implicit_none_export)
 	{
 	  const char *guessed
 	    = gfc_lookup_function_fuzzy (sym->name, sym->ns->sym_root);