Fortran: namelist-object-name renaming.

PR fortran/105847

gcc/fortran/ChangeLog:

	* trans-io.cc (transfer_namelist_element): When building the
	namelist object name, if the use rename attribute is set, use
	the local name specified in the use statement.

gcc/testsuite/ChangeLog:

	* gfortran.dg/pr105847.f90: New test.

gcc/fortran/trans-io.cc

@@ -1692,8 +1692,10 @@ transfer_namelist_element (stmtblock_t * block, const char * var_name,
   gcc_assert (sym || c);
 
   /* Build the namelist object name.  */
-
-  string = gfc_build_cstring_const (var_name);
+  if (sym && !sym->attr.use_only && sym->attr.use_rename)
+    string = gfc_build_cstring_const (sym->ns->use_stmts->rename->local_name);
+  else
+    string = gfc_build_cstring_const (var_name);
   string = gfc_build_addr_expr (pchar_type_node, string);
 
   /* Build ts, as and data address using symbol or component.  */

gcc/testsuite/gfortran.dg/pr105847.f90

@@ -0,0 +1,39 @@
+! { dg-do run }
+module m
+   integer :: name_in_module = 123
+end module
+
+program foo
+
+   use m, name_in_program => name_in_module
+   namelist /nl/ name_in_program
+
+   if (name_in_program /= 123) stop 1
+
+   open(unit=10, file='fort.10', status='replace')
+   write(10,nl)
+   close(10)
+
+   name_in_program = 42
+   if (name_in_program /= 42) stop 2
+
+   open(unit=10, file='fort.10', status='old')
+   read(10,nl)
+   if (name_in_program /= 123) stop 3
+   close(10)
+
+   call bar
+
+   contains
+
+      subroutine bar
+         integer name_in_program
+         namelist /nl/ name_in_program
+         name_in_program = 0
+         open(unit=10, file='fort.10', status='old')
+         read(10,nl)
+         if (name_in_program /= 123) stop 4
+         close(10,status='delete')
+      end subroutine bar
+
+end