[Bug lto/52605] New: LTO -g ICE when looking up context of VMTs of classes defined within functions

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52605

             Bug #: 52605
           Summary: LTO -g ICE when looking up context of VMTs of classes
                    defined within functions
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: jamb...@gcc.gnu.org
              Host: x86_64-linux-gnu
            Target: x86_64-linux-gnu


Created attachment 26905
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26905
Testcase

When compiling the attached testcase with -flto and -g, I get the
following ICE:

lto1: internal compiler error: tree check: expected tree that contains ‘decl
minimal’ structure, have ‘record_type’ in lookup_decl_die, at dwarf2out.c:5118

This is the same problem I first encountered when LTOing Firefox and
which I reported in the mailing list a while ago
(http://gcc.gnu.org/ml/gcc-patches/2012-03/msg00551.html) but this
testcase is close to minimal.

The reason why we do not hit this wrong use of decl_function_context
without LTO is that the function dwarf2out_decl is never called on
VMTs when not doing LTO.