https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88840
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The following program no longer compiles with clang:
#include <vector>
struct Something
{
std::vector<Something> member;
};
int main() {}
It produces the following error:
In file included from t.cpp:1:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/vector:60:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_algobase.h:64:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_pair.h:59:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/move.h:55:
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/type_traits:667:38:
error: incomplete type 'Something' used in type trait expression
: public integral_constant<bool, __is_trivial(_Tp)>
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:901:7:
note: in instantiation of template class 'std::is_trivial<Something>' requested
here
: is_trivial<_Tp> { };
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:904:31:
note: in instantiation of template class
'std::__is_trivially_relocatable<Something, void>' requested here
inline __enable_if_t<std::__is_trivially_relocatable<_Tp>::value, _Tp*>
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:940:23:
note: while substituting deduced template arguments into function template
'__relocate_a_1'
[with _Tp = Something, _Up = Something]
noexcept(noexcept(__relocate_a_1(std::__niter_base(__first),
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_vector.h:428:11:
note: in instantiation of exception specification for
'__relocate_a<Something *, Something *, std::allocator<Something> >'
requested here
noexcept(std::__relocate_a(std::declval<pointer>(),
^
t.cpp:5:26: note: in instantiation of template class 'std::vector<Something,
std::allocator<Something> >' requested here
std::vector<Something> member;
^
t.cpp:3:8: note: definition of 'Something' is not complete until the closing
'}'
struct Something
^
And two more similar errors. We need to support incomplete types, so we need to
delay the evaluation of __relocatable until it's needed.
