re PR fortran/30973 ([4.1, 4.2 only] undetected name conflict: variables may be named like modules)

2007-03-08  Tobias Burnus  <burnus@net-b.de>

	PR fortran/30973
	* module.c (read_module): Always import module name as symbol.
	(gfc_match_use): Disallow module name in the only clause of
	a use statement.

2007-03-08  Tobias Burnus  <burnus@net-b.de>

	PR fortran/30973
	* gfortran.dg/use_4.f90: New test.
	* gfortran.dg/used_dummy_types_7.f90: Correct ambiguous symbol.

From-SVN: r122696

gcc/fortran/ChangeLog

-2007-03-08  Paul Thomas  <pault@gcc.gnu.org>
-
-	PR fortran/31011
-	* expr.c (find_array_section): Correct arithmetic for section
-	size.
-
+2007-07-08  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/30973
+	* module.c (read_module): Always import module name as symbol.
+	(gfc_match_use): Disallow module name in the only clause of
+	a use statement.
+
+2007-03-08  Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/31011
+	* expr.c (find_array_section): Correct arithmetic for section
+	size.
+
 2007-03-07  Brooks Moses  <brooks.moses@codesourcery.com>
 
 	* iresolve.c (gfc_resolve_ishftc): Correct s_kind value.

gcc/fortran/module.c

@@ -619,6 +619,14 @@ gfc_match_use (void)
 		goto cleanup;
 	    }
 
+	  if (strcmp (new->use_name, module_name) == 0
+	      || strcmp (new->local_name, module_name) == 0)
+	    {
+	      gfc_error ("The name '%s' at %C has already been used as "
+			 "an external module name.", module_name);
+	      goto cleanup;
+	    }
+
 	  break;
 
 	case INTERFACE_USER_OP:
@@ -3438,6 +3446,9 @@ read_module (void)
 	  /* Get the jth local name for this symbol.  */
 	  p = find_use_name_n (name, &j);
 
+	  if (p == NULL && strcmp (name, module_name) == 0)
+	    p = name;
+
 	  /* Skip symtree nodes not in an ONLY clause, unless there
 	     is an existing symtree loaded from another USE
 	     statement.  */

gcc/testsuite/ChangeLog

-2007-03-08  Paul Thomas  <pault@gcc.gnu.org>
-
-	PR fortran/31011
-	* gfortran.dg/parameter_array_section_2.f90: New test.
+2007-03-08  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/30973
+	* gfortran.dg/use_4.f90: New test.
+	* gfortran.dg/used_dummy_types_7.f90: Correct ambiguous symbol.
+
+2007-03-08  Paul Thomas  <pault@gcc.gnu.org>
+
+	PR fortran/31011
+	* gfortran.dg/parameter_array_section_2.f90: New test.
 
 2007-03-08  Volker Reichelt  <reichelt@netcologne.de>
 

gcc/testsuite/gfortran.dg/use_4.f90

+! { dg-do "compile" }
+! PR fortran/30973
+! Using symbols with the name of the module
+
+module foo
+  integer :: i
+end module foo
+
+module bar
+  integer :: j
+end module bar
+
+module test
+  use foo, only:
+  integer :: foo ! { dg-error "cannot have a type" }
+end module test
+
+module test2
+  use bar, only: foo => j
+  use foo ! ok, unless foo is accessed
+end module test2
+
+module test3
+  use bar, only: foo => j
+  use foo ! ok, unless foo is accessed
+  foo = 5 ! { dg-error "is an ambiguous reference to 'j'" }
+end module test3
+
+program test_foo
+  use foo, only: foo  ! { dg-error "been used as an external module name" }
+  use foo, only: i => foo! { dg-error "been used as an external module name" }
+  use foo, only: foo => i! { dg-error "been used as an external module name" }
+end program

gcc/testsuite/gfortran.dg/used_dummy_types_7.f90

@@ -33,12 +33,12 @@ END MODULE
 
 MODULE list
 INTERFACE
-  SUBROUTINE dummy_atom_list_insert(this, atom)
+  SUBROUTINE dummy_atom_list_insert(this, atom2)
     USE types, ONLY: dummy_atom_list
     USE atom, ONLY: dummy_atom
 
     TYPE(dummy_atom_list), INTENT(inout) :: this
-    TYPE(dummy_atom), INTENT(in)         :: atom
+    TYPE(dummy_atom), INTENT(in)         :: atom2
   END SUBROUTINE
 END INTERFACE
 END MODULE