[Bug c/92982] New: cpp_string_location_reader :: m_line_table seems redundant ?

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92982

            Bug ID: 92982
           Summary: cpp_string_location_reader :: m_line_table seems
                    redundant ?
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Following on from a gcc trunk build with clang, m_line_table
seems redundant.

After this patch, I still get a build:

Index: libcpp/charset.c
===================================================================
--- libcpp/charset.c    (revision 279450)
+++ libcpp/charset.c    (working copy)
@@ -2248,7 +2248,7 @@
 cpp_string_location_reader::
 cpp_string_location_reader (location_t src_loc,
                line_maps *line_table)
-: m_line_table (line_table)
+// : m_line_table (line_table) dcb: not used
 {
   src_loc = get_range_from_loc (line_table, src_loc).m_start;

Index: libcpp/include/cpplib.h
===================================================================
--- libcpp/include/cpplib.h (revision 279450)
+++ libcpp/include/cpplib.h (working copy)
@@ -912,7 +912,7 @@
  private:
   location_t m_loc;
   int m_offset_per_column;
-  line_maps *m_line_table;
+  // line_maps *m_line_table; dcb: not used.
 };