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Subject: [Bug c++/44561] using nullptr_t with -flto/-fwhopr causes ICE: tree code 'lang_type' is not supported in gimple streams
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44561

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-11 09:30:57 UTC ---
New problems.

typedef decltype(nullptr) nullptr_t;
class shared_ptr {
public:
    shared_ptr(nullptr_t __p);
};
shared_ptr p = nullptr;

exposes a nullptr constant (INTEGER_CST of LANG_TYPE).  Of course
build_int_cst_wide doesn't like this at all.  From
cp/decl.c:cxx_init_decl_processing():

    nullptr_node = make_node (INTEGER_CST);
    TREE_TYPE (nullptr_node) = nullptr_type_node;

:(

One more reason to make NULLPTR_TYPE a regular middle-end tree code.