re PR fortran/60526 (Accepts-invalid: Variable name same as type name)

2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/60526
	* decl.c (build_sym):  If the name has already been defined as a
	type, it has a symtree with an upper case letter at the beginning.
	If such a symtree exists, issue an error and exit.  Don't do
	this if there is no corresponding upper case letter.


2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/60526
	* gfortran.dg/type_decl_4.f90:  Reinstated.

From-SVN: r233413

gcc/fortran/ChangeLog

 2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/60526
+	* decl.c (build_sym):  If the name has already been defined as a
+	type, it has a symtree with an upper case letter at the beginning.
+	If such a symtree exists, issue an error and exit.  Don't do
+	this if there is no corresponding upper case letter.
+
+2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/60526
 	PR bootstrap/69816
 	* decl.c (build_sym):  Reverted previous patch.
 

gcc/fortran/decl.c

@@ -1215,10 +1215,38 @@ build_sym (const char *name, gfc_charlen *cl, bool cl_deferred,
 {
   symbol_attribute attr;
   gfc_symbol *sym;
+  int upper;
 
   if (gfc_get_symbol (name, NULL, &sym))
     return false;
 
+  /* Check if the name has already been defined as a type.  The
+     first letter of the symtree will be in upper case then.  Of
+     course, this is only necessary if the upper case letter is
+     actually different.  */
+
+  upper = TOUPPER(name[0]);
+  if (upper != name[0])
+    {
+      char u_name[GFC_MAX_SYMBOL_LEN + 1];
+      gfc_symtree *st;
+      int nlen;
+
+      nlen = strlen(name);
+      gcc_assert (nlen <= GFC_MAX_SYMBOL_LEN);
+      strncpy (u_name, name, nlen + 1);
+      u_name[0] = upper;
+
+      st = gfc_find_symtree (gfc_current_ns->sym_root, u_name);
+
+      if (st != 0)
+	{
+	  gfc_error ("Symbol %qs at %C also declared as a type at %L", name,
+		     &st->n.sym->declared_at);
+	  return false;
+	}
+    }
+
   /* Start updating the symbol table.  Add basic type attribute if present.  */
   if (current_ts.type != BT_UNKNOWN
       && (sym->attr.implicit_type == 0

gcc/testsuite/ChangeLog

+2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/60526
+	* gfortran.dg/type_decl_4.f90:  Reinstated.
+
 2016-02-14  John David Anglin  <danglin@gcc.gnu.org>
 
 	PR fortran/68746

gcc/testsuite/gfortran.dg/type_decl_4.f90

+! { dg-do compile }
+program main
+  type Xx ! { dg-error "Symbol 'xx' at .1. also declared as a type at .2." }
+  end type Xx
+  real :: Xx  ! { dg-error "Symbol 'xx' at .1. also declared as a type at .2." }
+  
+end program main