[Bug debug/91887] New: -fdebug-types-section ICE building chromium

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91887

            Bug ID: 91887
           Summary: -fdebug-types-section ICE building chromium
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jason at gcc dot gnu.org
  Target Milestone: ---

Created attachment 46938
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46938&action=edit
unincluded testcase

Compiling this file with -g -fdebug-types-section hits an ICE under
lookup_external_ref, because we're trying to look up a DW_TAG_typedef that has
no symbol.  We shouldn't be trying to form an external reference to a typedef
in the first place; brief attempts to come up with a small testcase have not
reproduced the problem.