Error on Associate with a program.

2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

    PR fortran/92780
    * resolve.c (resolve_assoc_var): Issue error if the associating
    entity is a program.

2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

    PR fortran/92780
    * gfortran.dg/associate_50.f90: New test.

From-SVN: r279088

gcc/fortran/ChangeLog

 2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
+	PR fortran/92780
+	* resolve.c (resolve_assoc_var): Issue error if the associating
+	entity is a program.
+
+2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
 	PR fortran/92764
 	* interface.c (gfc_procedure_use): Check for existence of derived
 	component before using (twice).

gcc/fortran/resolve.c

@@ -8842,6 +8842,12 @@ resolve_assoc_var (gfc_symbol* sym, bool resolve_target)
 
       gcc_assert (target->symtree);
       tsym = target->symtree->n.sym;
+      if (tsym->attr.flavor == FL_PROGRAM)
+	{
+	  gfc_error ("Associating entity %qs at %L is a PROGRAM",
+		     tsym->name, &target->where);
+	  return;
+	}
 
       sym->attr.asynchronous = tsym->attr.asynchronous;
       sym->attr.volatile_ = tsym->attr.volatile_;

gcc/testsuite/ChangeLog

 2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
+	PR fortran/92780
+	* gfortran.dg/associate_50.f90: New test.
+
+2018-12-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
 	PR fortran/92764
 	* gfortran.dg/interface_44.f90: New test.
 

gcc/testsuite/gfortran.dg/associate_50.f90

+! { dg-do compile }
+! PR 92780 - this used to ICE instead of being rejected.
+! Test case by Gerhard Steinmetz.
+
+program p
+  associate (y => p) ! { dg-error "is a PROGRAM" }
+  end associate
+end program p