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[Patch, Fortran] PR34514 - prevent double initialization and dimension changes after initialization


It is completely unclear what value "n" has after:

  integer :: n = 4
  dimension :: n(3)


similarly invalid is:
  integer :: n = 5
  parameter (n = 7)

This patch adds checks to reject this.

Please try to come up with things which should be rejected; I think
there are none, but I still might have missed something.  ;-)

Build and regtested on x86-64. OK for the trunk?

Tobias

PS: I did not check the standard, but ifort and NAG f95 reject it. As it
makes sense, I believe these compilers. If needed be, I can still try to
find it in the standard.
2007-12-17  Tobias Burnus  <burnus@net-b.de>

	PR fortran/34514
	* decl.c (attr_decl1): Reject specifying the DIMENSION for
	already initialized variable.
	(do_parm): Reject PARAMETER for already initialized variable.

2007-12-17  Tobias Burnus  <burnus@net-b.de>

	PR fortran/34514
	* gfortran.dg/initialization_17.f90: New.

Index: gcc/fortran/decl.c
===================================================================
--- gcc/fortran/decl.c	(revision 131009)
+++ gcc/fortran/decl.c	(working copy)
@@ -5151,6 +5151,14 @@ attr_decl1 (void)
 	  goto cleanup;
 	}
 
+      if (current_attr.dimension && sym->value)
+	{
+	  gfc_error ("Dimensions specified for %s at %L after its "
+		     "initialisation", sym->name, &var_locus);
+	  m = MATCH_ERROR;
+	  goto cleanup;
+	}
+
       if ((current_attr.allocatable || current_attr.pointer)
 	  && (m == MATCH_YES) && (as->type != AS_DEFERRED))
 	{
@@ -5753,6 +5761,13 @@ do_parm (void)
       goto cleanup;
     }
 
+  if (sym->value)
+    {
+      gfc_error ("Initializing already initialized variable at %C");
+      m = MATCH_ERROR;
+      goto cleanup;
+    }
+
   if (sym->ts.type == BT_CHARACTER
       && sym->ts.cl != NULL
       && sym->ts.cl->length != NULL
Index: gcc/testsuite/gfortran.dg/initialization_17.f90
===================================================================
--- gcc/testsuite/gfortran.dg/initialization_17.f90	(revision 0)
+++ gcc/testsuite/gfortran.dg/initialization_17.f90	(revision 0)
@@ -0,0 +1,10 @@
+! { dg-do compile }
+!
+! PR fortran/34514
+!
+! Initialization and typespec changes.
+!
+integer :: n = 5, m = 7
+parameter (n = 42) ! { dg-error "Initializing already initialized variable" }
+dimension :: m(3)  ! { dg-error "after its initialisation" } 
+end

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