re PR fortran/47448 (Invalid check for ASSIGNMENT(=))

2011-01-25  Tobias Burnus  <burnus@net-b.de>

        PR fortran/47448
        * interface.c (gfc_check_operator_interface): Fix
        defined-assignment check.

2011-01-25  Tobias Burnus  <burnus@net-b.de>

        PR fortran/47448
        * gfortran.dg/redefined_intrinsic_assignment_2.f90: New.

From-SVN: r169228

gcc/fortran/ChangeLog

+2011-01-25  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/47448
+	* interface.c (gfc_check_operator_interface): Fix
+	defined-assignment check.
+
 2011-01-23  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/47421

gcc/fortran/interface.c

@@ -654,11 +654,12 @@ gfc_check_operator_interface (gfc_symbol *sym, gfc_intrinsic_op op,
 
       /* Allowed are (per F2003, 12.3.2.1.2 Defined assignments):
 	 - First argument an array with different rank than second,
-	 - Types and kinds do not conform, and
+	 - First argument is a scalar and second an array,
+	 - Types and kinds do not conform, or
 	 - First argument is of derived type.  */
       if (sym->formal->sym->ts.type != BT_DERIVED
 	  && sym->formal->sym->ts.type != BT_CLASS
-	  && (r1 == 0 || r1 == r2)
+	  && (r2 == 0 || r1 == r2)
 	  && (sym->formal->sym->ts.type == sym->formal->next->sym->ts.type
 	      || (gfc_numeric_ts (&sym->formal->sym->ts)
 		  && gfc_numeric_ts (&sym->formal->next->sym->ts))))

gcc/testsuite/ChangeLog

+2011-01-25  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/47448
+	* gfortran.dg/redefined_intrinsic_assignment_2.f90: New.
+
 2011-01-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/47427

gcc/testsuite/gfortran.dg/redefined_intrinsic_assignment_2.f90

+! { dg-do compile }
+!
+! PR fortran/47448
+!
+! ASSIGNMENT(=) checks. Defined assignment is allowed if and only if
+! it does not override an intrinsic assignment.
+!
+
+module test1
+  interface assignment(=)
+     module procedure valid, valid2
+  end interface
+contains
+  ! Valid: scalar = array
+  subroutine valid (lhs,rhs)
+    integer, intent(out) ::  lhs
+    integer, intent(in) :: rhs(:)
+    lhs = rhs(1) 
+  end subroutine valid
+
+  ! Valid: array of different ranks
+  subroutine valid2 (lhs,rhs)
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs(:,:)
+    lhs(:) = rhs(:,1) 
+  end subroutine valid2
+end module test1
+
+module test2
+  interface assignment(=)
+     module procedure invalid
+  end interface
+contains
+  ! Invalid: scalar = scalar
+  subroutine invalid (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs
+    integer, intent(in) :: rhs
+    lhs = rhs
+  end subroutine invalid
+end module test2
+
+module test3
+  interface assignment(=)
+     module procedure invalid2
+  end interface
+contains
+  ! Invalid: array = scalar
+  subroutine invalid2 (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs
+    lhs(:) = rhs
+  end subroutine invalid2
+end module test3
+
+module test4
+  interface assignment(=)
+     module procedure invalid3
+  end interface
+contains
+  ! Invalid: array = array for same rank
+  subroutine invalid3 (lhs,rhs) ! { dg-error "must not redefine an INTRINSIC type assignment" }
+    integer, intent(out) ::  lhs(:)
+    integer, intent(in) :: rhs(:)
+    lhs(:) = rhs(:)
+  end subroutine invalid3
+end module test4
+
+! { dg-final { cleanup-modules "test1" } }