Package: gcc-12
Version: 12.2.0-14
Severity: normal
X-Debbugs-Cc: cnba...@gmail.com
Dear Maintainer,
The following C++20 code can be compiled with GCC 12.3 or later but can't be
compiled on Debian 12 with GCC 12.2:
```
#include <atomic>
#include <memory>
class A{ int a; };
int main()
{
std::atomic<std::shared_ptr<A>> a_ptr = std::make_shared<A>();
a_ptr = nullptr;
return 0;
}
```
Error Messages:
```
test.cpp: In function ‘int main()’:
test.cpp:9:13: error: ambiguous overload for ‘operator=’ (operand types are
‘std::atomic<std::shared_ptr<A> >’ and ‘std::nullptr_t’)
9 | a_ptr = nullptr;
| ^~~~~~~
In file included from /usr/include/c++/12/memory:78,
from test.cpp:2:
/usr/include/c++/12/bits/shared_ptr_atomic.h:585:12: note: candidate: ‘void
std::atomic<std::shared_ptr<_Tp> >::operator=(const
std::atomic<std::shared_ptr<_Tp> >&) [with _Tp = A]’ (deleted)
585 | void operator=(const atomic&) = delete;
| ^~~~~~~~
/usr/include/c++/12/bits/shared_ptr_atomic.h:600:7: note: candidate: ‘void
std::atomic<std::shared_ptr<_Tp> >::operator=(std::shared_ptr<_Tp>) [with _Tp =
A]’
600 | operator=(shared_ptr<_Tp> __desired) noexcept
| ^~~~~~~~
```
This may be a bug of GCC 12.2, please upgrade GCC version of Debian 12.
-- System Information:
Debian Release: 12.7
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-26-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages gcc-12 depends on:
ii binutils 2.40-2
ii cpp-12 12.2.0-14
ii gcc-12-base 12.2.0-14
ii libc6 2.36-9+deb12u8
ii libcc1-0 12.2.0-14
ii libgcc-12-dev 12.2.0-14
ii libgcc-s1 12.2.0-14
ii libgmp10 2:6.2.1+dfsg1-1.1
ii libisl23 0.25-1.1
ii libmpc3 1.3.1-1
ii libmpfr6 4.2.0-1
ii libstdc++6 12.2.0-14
ii libzstd1 1.5.4+dfsg2-5
ii zlib1g 1:1.2.13.dfsg-1
Versions of packages gcc-12 recommends:
ii libc6-dev 2.36-9+deb12u8
Versions of packages gcc-12 suggests:
pn gcc-12-doc <none>
pn gcc-12-locales <none>
pn gcc-12-multilib <none>
-- no debconf information
