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* [Bug c++/105595] New: Coroutines can trigger -Wsubobject-linkage
@ 2022-05-13 16:21 blubban at gmail dot com
2022-11-07 16:53 ` [Bug c++/105595] " pinskia at gcc dot gnu.org
2022-12-09 15:23 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: blubban at gmail dot com @ 2022-05-13 16:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105595
Bug ID: 105595
Summary: Coroutines can trigger -Wsubobject-linkage
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: blubban at gmail dot com
Target Milestone: ---
To reproduce:
- Create a minimal coroutine promise
- Create a coroutine where any local's type has no linkage (for example a
lambda)
- #include the above from another, differently named, file
Result:
/app/not_example.cpp:25:1: warning: 'foo()::_Z3foov.Frame' has a field
'foo()::_Z3foov.Frame::anon_ns_1_2' whose type uses the anonymous namespace
[-Wsubobject-linkage]
/app/not_example.cpp:25:1: warning: 'foo()::_Z3foov.Frame' has a field
'foo()::_Z3foov.Frame::inner_class_1_2' whose type has no linkage
[-Wsubobject-linkage]
/app/not_example.cpp:25:1: warning: 'foo()::_Z3foov.Frame' has a field
'foo()::_Z3foov.Frame::a_lambda_1_2' whose type has no linkage
[-Wsubobject-linkage]
Expected:
No warning, because the coroutine frame's type shouldn't have linkage either.
Sticking anonymous types inside each other is harmless.
Full testcase:
# 2 "/app/not_example.cpp" 1
#include <coroutine>
class async {
public:
class promise_type {
public:
async get_return_object() { return {}; }
std::suspend_never initial_suspend() { return {}; }
std::suspend_never final_suspend() noexcept { return {}; }
void unhandled_exception() {}
};
};
namespace {
class anon_ns_t {};
}
async foo()
{
anon_ns_t anon_ns;
class inner_class_t {} inner_class;
auto a_lambda = [](){};
co_await std::suspend_never{};
}
Compile with -std=c++20.
Compiler Explorer: https://godbolt.org/z/efz6dfoWq
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/105595] Coroutines can trigger -Wsubobject-linkage
2022-05-13 16:21 [Bug c++/105595] New: Coroutines can trigger -Wsubobject-linkage blubban at gmail dot com
@ 2022-11-07 16:53 ` pinskia at gcc dot gnu.org
2022-12-09 15:23 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-11-07 16:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105595
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dennis-hezel at gmx dot de
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 107556 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/105595] Coroutines can trigger -Wsubobject-linkage
2022-05-13 16:21 [Bug c++/105595] New: Coroutines can trigger -Wsubobject-linkage blubban at gmail dot com
2022-11-07 16:53 ` [Bug c++/105595] " pinskia at gcc dot gnu.org
@ 2022-12-09 15:23 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-12-09 15:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105595
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2022-12-09
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. I noticed this also when reducing a different testcase.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-12-09 15:23 UTC | newest]
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2022-05-13 16:21 [Bug c++/105595] New: Coroutines can trigger -Wsubobject-linkage blubban at gmail dot com
2022-11-07 16:53 ` [Bug c++/105595] " pinskia at gcc dot gnu.org
2022-12-09 15:23 ` pinskia at gcc dot gnu.org
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