re PR fortran/28526 ('end' is recognized as a variable incorrectly)

2006-09-18 Paul Thomas <pault@gcc.gnu.org>

	PR fortran/28526
	* primary.c (match_variable): If the compiler is in a module
	specification block, an interface block or a contains section,
	reset host_flag to force the changed symbols mechanism.

	PR fortran/29101
	* trans-stmt.c (gfc_trans_character_select): Add the post block
	for the expression to the main block, after the call to
	select_string and the last label.


2006-09-18 Paul Thomas <pault@gcc.gnu.org>

	PR fortran/28526
	* gfortran.dg/keyword_symbol_1.f90: New test.

	* gfortran.dg/spread_shape_1.f90: Add missing warning with
	pedantic compilation option.

From-SVN: r117034

gcc/fortran/ChangeLog

+2006-09-18 Paul Thomas <pault@gcc.gnu.org>
+
+	PR fortran/28526
+	* primary.c (match_variable): If the compiler is in a module
+	specification block, an interface block or a contains section,
+	reset host_flag to force the changed symbols mechanism.
+
+	PR fortran/29101
+	* trans-stmt.c (gfc_trans_character_select): Add the post block
+	for the expression to the main block, after the call to
+	select_string and the last label.
+
 2006-09-18  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/29060

gcc/fortran/primary.c

@@ -2283,6 +2283,17 @@ match_variable (gfc_expr ** result, int equiv_flag, int host_flag)
   locus where;
   match m;
 
+  /* Since nothing has any business being an lvalue in a module
+     specification block, an interface block or a contains section,
+     we force the changed_symbols mechanism to work by setting
+     host_flag to 0. This prevents valid symbols that have the name
+     of keywords, such as 'end', being turned into variables by
+     failed matching to assignments for, eg., END INTERFACE.  */
+  if (gfc_current_state () == COMP_MODULE
+      || gfc_current_state () == COMP_INTERFACE
+      || gfc_current_state () == COMP_CONTAINS)
+    host_flag = 0;
+
   m = gfc_match_sym_tree (&st, host_flag);
   if (m != MATCH_YES)
     return m;

gcc/fortran/trans-stmt.c

@@ -1475,6 +1475,8 @@ gfc_trans_character_select (gfc_code *code)
   if (n != 0)
     gfc_free (labels);
 
+  gfc_add_block_to_block (&block, &se.post);
+
   return gfc_finish_block (&block);
 }
 

gcc/testsuite/ChangeLog

+2006-09-18 Paul Thomas <pault@gcc.gnu.org>
+
+	PR fortran/28526
+	* gfortran.dg/keyword_symbol_1.f90: New test.
+
+	* gfortran.dg/spread_shape_1.f90: Add missing warning with
+	pedantic compilation option.
+
 2006-09-18  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/29060

gcc/testsuite/gfortran.dg/keyword_symbol_1.f90

+! ' dg-do compile }
+! This tests the fix for PR28526, in which a public interface named
+! 'end' would be treated as a variable because the matcher tried
+! 'END INTERFACE' as an assignment and left the symbol modified in
+! failing. The various pitfalls that were encountered in developing
+! the fix are checked here.
+!
+! Contributed by Paul Thomas  <pault@gcc.gnu.org>
+!
+module blahblah
+  public function, end
+
+! The original PR from Yusuke IGUCHI <iguchi@coral.t.u-tokyo.ac.jp>
+  interface end
+    module procedure foo1
+  end interface
+
+! A contribution to the PR from Tobias Schlueter  <tobi@gcc.gnu.org>
+  interface function
+     module procedure foo2 ! { dg-error "is neither function nor" }
+  end interface
+
+  interface function
+     module procedure foo3
+  end interface
+
+  interface
+    function foo4 ()
+      real foo4
+      x = 1.0          ! { dg-error "in INTERFACE" }
+    end function foo4
+  end interface
+
+  interface
+    x = 2.0            ! { dg-error "in INTERFACE block" }
+    function foo5 ()
+      real foo5
+    end function foo5
+  end interface
+
+  x = 3.0              ! { dg-error "in MODULE" }
+
+contains
+
+  subroutine foo1
+  end subroutine foo1
+
+  function foo2        ! { dg-error "Expected formal argument list" }
+    foo2 = 0           ! { dg-error "already been host associated" }
+  end function foo2    ! { dg-error "Expecting END MODULE" }
+
+  function foo3 ()
+    real foo3
+  end function foo3
+
+  x = 4.0              ! { dg-error "in CONTAINS section" }
+end module blahblah

gcc/testsuite/gfortran.dg/spread_shape_1.f90

@@ -4,7 +4,7 @@
 !
 ! Contributed by Paul Thomas  <pault@gcc.gnu.org>
   real,dimension(:, :),pointer :: ptr
-  real,dimension(2, 2),parameter :: u = &
+  real,dimension(2, 2),parameter :: u = & ! { dg-warning "nonstandard" }
 	reshape((/0.25, 0.5, 0.75, 1.00/),(/2,2/))
   allocate (ptr(2,2))