On 05. 11. 20 15:47, Marshall Clow via cfe-users wrote:
I tried this code on compiler explorer.
It compiles w/o error with clang + libc++
It fails to compile with clang and libstdc++
The error message given is:
In file included from <source>:1:
/opt/compiler-explorer/gcc-10.2.0/lib/gcc/x86_64-linux-gnu/10.2.0/../../../../include/c++/10.2.0/optional:158:7:
error: the parameter for this explicitly-defaulted copy assignment
operator is const, but a member or base requires it to be non-const
operator=(const _Optional_payload_base&) = default;
^
/opt/compiler-explorer/gcc-10.2.0/lib/gcc/x86_64-linux-gnu/10.2.0/../../../../include/c++/10.2.0/optional:357:7:
note: in instantiation of template class
'std::_Optional_payload_base<S>' requested here
: _Optional_payload_base<_Tp>
^
/opt/compiler-explorer/gcc-10.2.0/lib/gcc/x86_64-linux-gnu/10.2.0/../../../../include/c++/10.2.0/optional:631:30:
note: in instantiation of template class 'std::_Optional_payload<S,
true, false, false>' requested here
_Optional_payload<_Tp> _M_payload;
^
/opt/compiler-explorer/gcc-10.2.0/lib/gcc/x86_64-linux-gnu/10.2.0/../../../../include/c++/10.2.0/optional:660:15:
note: in instantiation of template class 'std::_Optional_base<S, true,
true>' requested here
: private _Optional_base<_Tp>,
^
<source>:10:20: note: in instantiation of template class
'std::optional<S>' requested here
std::optional<S> a;
^
1 error generated.
I got exactly the same error, but the question is why. Shouldn't both
g++ and clang++ behave the same way even on the libstdc++ (which is the
default library clang uses on a lot of distros)? Is this gcc being too
permissive to some bug in libstdc++ or is it a clang bug? Should I file
a bug report to clang?
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