https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79486
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-02-13
Known to work| |6.3.1
Target Milestone|--- |7.0
Summary|[7 Regression] |[7 Regression]
| |packaged_task uses wrong
| |value category with
| |result_of
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
#include <future>
struct F {
int& operator()() & { return i; }
void operator()() && = delete;
int i = 0;
};
int main()
{
std::packaged_task<int()> t{F{}};
t();
}
This fails to compie, and also gives an ICE (which I'll report separately)
In file included from task.cc:1:0:
/home/jwakely/gcc/7/include/c++/7.0.1/future: In instantiation of ‘struct
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args ...)>::_M_run(_Args&&
...) [with _Fn = F; _Alloc = std::allocator<int>; _Res = int; _Args =
{}]::<lambda>’:
/home/jwakely/gcc/7/include/c++/7.0.1/future:1419:7: required from ‘void
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args ...)>::_M_run(_Args&&
...) [with _Fn = F; _Alloc = std::allocator<int>; _Res = int; _Args = {}]’
task.cc:13:1: required from here
/home/jwakely/gcc/7/include/c++/7.0.1/future:1419:66: error: no type named
‘type’ in ‘class std::result_of<F()>’
auto __boundfn = [&] () -> typename result_of<_Fn(_Args&&...)>::type {
^~~~
/home/jwakely/gcc/7/include/c++/7.0.1/future: In instantiation of ‘struct
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run_delayed(_Args&& ...,
std::weak_ptr<std::__future_base::_State_baseV2>) [with _Fn = F; _Alloc =
std::allocator<int>; _Res = int; _Args = {}]::<lambda>’:
/home/jwakely/gcc/7/include/c++/7.0.1/future:1428:7: required from ‘void
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run_delayed(_Args&& ...,
std::weak_ptr<std::__future_base::_State_baseV2>) [with _Fn = F; _Alloc =
std::allocator<int>; _Res = int; _Args = {}]’
task.cc:13:1: required from here
/home/jwakely/gcc/7/include/c++/7.0.1/future:1428:66: error: no type named
‘type’ in ‘class std::result_of<F()>’
auto __boundfn = [&] () -> typename result_of<_Fn(_Args&&...)>::type {
^~~~
/home/jwakely/gcc/7/include/c++/7.0.1/future:600:7: error: ‘static
std::__future_base::_Task_setter<_Res_ptr, _BoundFn>
std::__future_base::_S_task_setter(_Res_ptr&, _BoundFn&) [with _Res_ptr =
std::unique_ptr<std::__future_base::_Result<int>,
std::__future_base::_Result_base::_Deleter>; _BoundFn =
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args ...)>::_M_run(_Args&&
...) [with _Fn = F; _Alloc = std::allocator<int>; _Res = int; _Args =
{}]::<lambda>; typename _Res_ptr::element_type::result_type = int]’, declared
using local type ‘std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run(_Args&& ...) [with _Fn = F; _Alloc = std::allocator<int>; _Res =
int; _Args = {}]::<lambda>’, is used but never defined [-fpermissive]
_S_task_setter(_Res_ptr& __ptr, _BoundFn& __call)
^~~~~~~~~~~~~~
/home/jwakely/gcc/7/include/c++/7.0.1/future:600:7: error: ‘static
std::__future_base::_Task_setter<_Res_ptr, _BoundFn>
std::__future_base::_S_task_setter(_Res_ptr&, _BoundFn&) [with _Res_ptr =
std::unique_ptr<std::__future_base::_Result<int>,
std::__future_base::_Result_base::_Deleter>; _BoundFn =
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run_delayed(_Args&& ...,
std::weak_ptr<std::__future_base::_State_baseV2>) [with _Fn = F; _Alloc =
std::allocator<int>; _Res = int; _Args = {}]::<lambda>; typename
_Res_ptr::element_type::result_type = int]’, declared using local type
‘std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run_delayed(_Args&& ...,
std::weak_ptr<std::__future_base::_State_baseV2>) [with _Fn = F; _Alloc =
std::allocator<int>; _Res = int; _Args = {}]::<lambda>’, is used but never
defined [-fpermissive]
/home/jwakely/gcc/7/include/c++/7.0.1/future: In instantiation of ‘static
std::__future_base::_Task_setter<_Res_ptr, _BoundFn>
std::__future_base::_S_task_setter(_Res_ptr&, _BoundFn&) [with _Res_ptr =
std::unique_ptr<std::__future_base::_Result<int>,
std::__future_base::_Result_base::_Deleter>; _BoundFn =
std::__future_base::_Task_state<_Fn, _Alloc, _Res(_Args
...)>::_M_run_delayed(_Args&& ...,
std::weak_ptr<std::__future_base::_State_baseV2>) [with _Fn = F; _Alloc =
std::allocator<int>; _Res = int; _Args = {}]::<lambda>]’:
/home/jwakely/gcc/7/include/c++/7.0.1/future:1426:7: required from here
/home/jwakely/gcc/7/include/c++/7.0.1/future:600:7: internal compiler error:
Segmentation fault
0xdc0ddf crash_signal
/home/jwakely/src/gcc/gcc/gcc/toplev.c:333
0x84c9b6 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
/home/jwakely/src/gcc/gcc/gcc/tree.h:3173
0x84c9b6 write_closure_type_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:1639
0x84c9b6 write_unqualified_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:1383
0x852717 write_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:937
0x8525bc write_local_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:2035
0x8525bc write_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:964
0x853209 write_class_enum_type
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:2777
0x853209 write_type
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:2195
0x8520e8 write_template_args
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:2806
0x85880d write_nested_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:1063
0x852457 write_name
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:976
0x8570d6 write_encoding
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:825
0x85915c mangle_decl_string
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:3757
0x8593ab get_mangled_id
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:3779
0x8593ab mangle_decl(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/cp/mangle.c:3849
0x1067f40 decl_assembler_name(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/tree.c:671
0x9aee1c symbol_table::insert_to_assembler_name_hash(symtab_node*, bool)
/home/jwakely/src/gcc/gcc/gcc/symtab.c:171
0x9b4e3f cgraph_node::create(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/cgraph.c:511
0x9b4c90 cgraph_node::get_create(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/cgraph.c:533
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
