https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90455
Bug ID: 90455
Summary: braced-init and incomplete type instantiation
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: faithandbrave at gmail dot com
Target Milestone: ---
Pattern A (OK) :
#include <memory>
struct B;
struct A { std::unique_ptr<B> p; };
int main() {}
Pattern B (Compilation Error) :
#include <memory>
struct B;
struct A { std::unique_ptr<B> p{}; };
int main() {}
===error begin===
In file included from /opt/wandbox/gcc-9.1.0/include/c++/9.1.0/memory:80,
from prog.cc:1:
/opt/wandbox/gcc-9.1.0/include/c++/9.1.0/bits/unique_ptr.h: In instantiation of
'void std::default_delete<_Tp>::operator()(_Tp*) const [with _Tp = B]':
/opt/wandbox/gcc-9.1.0/include/c++/9.1.0/bits/unique_ptr.h:289:17: required
from 'std::unique_ptr<_Tp, _Dp>::~unique_ptr() [with _Tp = B; _Dp =
std::default_delete<B>]'
prog.cc:4:33: required from here
/opt/wandbox/gcc-9.1.0/include/c++/9.1.0/bits/unique_ptr.h:79:16: error:
invalid application of 'sizeof' to incomplete type 'B'
79 | static_assert(sizeof(_Tp)>0,
| ^~~~~~~~~~~
===error end===
Clang with libc++ is OK both.
default_delete implementation is libstdc++ and libc++ are same.
I think the issue is compiler issue.
