[Bug c/59495] -ftrack-macro-expansion=2 ignores warnings originated from /usr/include headers

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59495

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'd say it's because in maybe_unwind_expanded_macro_loc we've got

  /* Walk LOC_VEC and print the macro expansion trace, unless the
     first macro which expansion triggered this trace was expanded
     inside a system header.  */
  int saved_location_line =
    expand_location_to_spelling_point (diagnostic->location).line;

  if (!LINEMAP_SYSP (map))
    FOR_EACH_VEC_ELT (loc_vec, ix, iter)
      {   
        ...
      }