[Bug bootstrap/107950] partial LTO linking of libbackend.a: gcc/gcc-rich-location.cc:207: undefined reference to `range_label_for_type_mismatch::get_text(unsigned int) const'

["dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107950

--- Comment #11 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #10)
> I suppose a fix would be to provide a dummy implementation for
> range_label_for_type_mismatch::get_text in lto/, but I wonder how
> for example the fortran frontend avoids this issue?
> 
> f951 has rich_location uses but no range_label_for_type_mismatch, it looks
> like range_label_for_* is used only from the C family frontends, so maybe
> another fix would be to move that class and implementation somewhere to
> c-family/?

AIUI class range_label_for_type_mismatch is only used:
  * by the C and C++ frontends (directly, and by
range_label_for_format_type_mismatch), and
  * by maybe_range_label_for_tree_type_mismatch::get_text in
gcc/gcc-rich-location.cc, which is used by class binary_op_rich_location in
gcc/gcc-rich-location.{h,cc}; the latter is only used by the C/C++ frontends.

So moving range_label_for_type_mismatch *and* binary_op_rich_location to
c/cp/c-family might be a fix for this; I'm not sure.