[Bug c++/66808] tree check fail in symbol_table::decl_assembler_name_hash

["dcb314 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66808

--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to David Binderman from comment #0)
> Created attachment 35932 [details]
> gzipped C++ source code
> 
> gcc trunk dated 20150707 does this
> 
> $ ../results/bin/gcc -c -O2 bug216.cc
> /home/dcb/rpmbuild/BUILD/qpid-cpp-0.32/src/qpid/sys/epoll/EpollPoller.cpp:
> 677:2: internal compiler error: Segmentation fault
>  }}
>   ^
> 0xe6d3ff crash_signal
> 	../../src/trunk/gcc/toplev.c:360
> 0x91fa84 tree_check(tree_node const*, char const*, int, char const*,
> tree_code)
> 	../../src/trunk/gcc/tree.h:3113
> 0x91fa84 symbol_table::decl_assembler_name_hash(tree_node const*)
> 	../../src/trunk/gcc/symtab.c:72
> 0x9265b2 symtab_node::get_for_asmname(tree_node const*)
> 	../../src/trunk/gcc/symtab.c:872

Some more detail from valgrind

==3165== Invalid read of size 8
==3165==    at 0xD1A12C: make_decl_rtl(tree_node*) (varasm.c:1361)
==3165==    by 0x830312: expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool) (expr.c:9445)
==3165==    by 0x838BB6: store_expr_with_bounds(tree_node*, rtx_def*, int,
bool, tree_node*) (expr.c:5398)
==3165==    by 0x83A0DC: expand_assignment(tree_node*, tree_node*, bool)
(expr.c:5170)

...

==3165==  Address 0x18 is not stack'd, malloc'd or (recently) free'd