[Bug debug/70578] New: internal compiler error: in output_index_string, at dwarf2out.c with -gsplit-dwarf

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70578

            Bug ID: 70578
           Summary: internal compiler error: in output_index_string, at
                    dwarf2out.c with -gsplit-dwarf
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Created attachment 38211
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38211&action=edit
preprocessed

With
Target: x86_64-pc-linux-gnu
Configured with: /home/marek/src/gcc/configure --enable-languages=c,c++,objc
--enable-checking=yes -with-system-zlib --disable-bootstrap --disable-libvtv
--disable-libcilkrts --disable-libitm --disable-libgomp --disable-libcc1
--disable-libstdcxx-pch --disable-libssp --disable-isl --disable-libatomic
Thread model: posix
gcc version 6.0.0 20160407 (experimental) (GCC)

I see:

$ ./cc1plus -fpreprocessed q.ii -quiet -g3 -gsplit-dwarf -O -w
q.ii:763:1: internal compiler error: in output_index_string, at
dwarf2out.c:25505
 }
 ^
0xa09c4e output_index_string(indirect_string_node**, unsigned int*)
        /home/marek/src/gcc/gcc/dwarf2out.c:25505
0xa1978e void hash_table<indirect_string_hasher,
xcallocator>::traverse_noresize<unsigned int*,
&(output_index_string(indirect_string_node**, unsigned int*))>(unsigned int*)
        /home/marek/src/gcc/gcc/hash-table.h:950
0xa09dd7 output_indirect_strings
        /home/marek/src/gcc/gcc/dwarf2out.c:25550
0xa0e8d6 dwarf2out_finish
        /home/marek/src/gcc/gcc/dwarf2out.c:27680
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with preprocessed source if appropriate.
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