[Bug debug/72828] New: ICE in clone_tree_partial when compiling with -fdebug-types-section

["ott at fb dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72828

            Bug ID: 72828
           Summary: ICE in clone_tree_partial when compiling with
                    -fdebug-types-section
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ott at fb dot com
  Target Milestone: ---

Created attachment 39067
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39067&action=edit
Repro for GCC 6.1.0

Trying to compile HHVM with -fdebug-types-section, it fails with an ICE in
clone_tree_partial. The attached repro was obtained with creduce. 
Note that while the original file ICEs with all the GCC versions I tested (4.9,
5.1, and 6.1), the attached repro only crashes with 6.1, probably the bug is
very dependent on code generation decisions (note that it doesn't crash without
--param=early-inlining-insns=200).

> g++ debug_types_ice_6.cpp -c -o /dev/null -std=c++11 -fdebug-types-section -O3  -g2 --param=early-inlining-insns=200 -w
debug_types_ice_6.cpp:237:1: internal compiler error: in clone_tree_partial, at
dwarf2out.c:7916
 }
 ^
0x7d2a20 clone_tree_partial
        ../../gcc/dwarf2out.c:7916
0x7d2b9f copy_decls_walk
        ../../gcc/dwarf2out.c:7981
0x7d2aef copy_decls_walk
        ../../gcc/dwarf2out.c:8021
0x7d2aef copy_decls_walk
        ../../gcc/dwarf2out.c:8021
0x7d2aef copy_decls_walk
        ../../gcc/dwarf2out.c:8021
0x7d2c74 copy_decls_walk
        ../../gcc/dwarf2out.c:8015
0x7d2aef copy_decls_walk
        ../../gcc/dwarf2out.c:8021
0x7d2aef copy_decls_walk
        ../../gcc/dwarf2out.c:8021
0x7dceee copy_decls_for_unworthy_types
        ../../gcc/dwarf2out.c:8035
0x7f759a dwarf2out_finish
        ../../gcc/dwarf2out.c:27406

>  g++ --version
g++ (GCC) 6.1.0