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>From gcc-bugzilla@gcc.gnu.org  Thu May  5 09:57:50 2022
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/105491] New: Usafe of __constinit with -std=c++ does is
 rejected
Date: Thu, 05 May 2022 09:57:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105491

            Bug ID: 105491
           Summary: Usafe of __constinit with -std=3Dc++ does is rejected
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Created attachment 52930
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52930&action=3Dedit
test-case

Noticed that in protobuf package:
https://github.com/protocolbuffers/protobuf/issues/9916

$ g++ 12.ii -c -std=3Dc++11
x.cc:39:123: error: =E2=80=98constinit=E2=80=99 variable
=E2=80=98_ProtobufCFileOptions_default_instance_=E2=80=99 does not have a c=
onstant initializer
   39 | PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT
PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 ProtobufCFileOptionsDefaultTypeInternal
_ProtobufCFileOptions_default_instance_;
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
x.cc:39:123: error:
=E2=80=98ProtobufCFileOptionsDefaultTypeInternal{ProtobufCFileOptionsDefaul=
tTypeInternal::<unnamed
union>{ProtobufCFileOptions{google::protobuf::Message{google::protobuf::Mes=
sageLite{((&
ProtobufCFileOptions::_ZTV20ProtobufCFileOptions) + 16),
google::protobuf::internal::InternalMetadata{0}}},
google::protobuf::internal::HasBits<1>{uint32_t [1]()},
google::protobuf::internal::CachedSize{std::atomic<int>{std::__atomic_base<=
int>{0}}},
google::protobuf::internal::ArenaStringPtr{google::protobuf::internal::Tagg=
edStringPtr{((void*)(&
google::protobuf::internal::fixed_address_empty_string))}}, false, false,
false, true, true}}}=E2=80=99 is not a constant expression
x.cc:53:126: error: =E2=80=98constinit=E2=80=99 variable
=E2=80=98_ProtobufCMessageOptions_default_instance_=E2=80=99 does not have =
a constant
initializer
   53 | PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT
PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 ProtobufCMessageOptionsDefaultTypeInternal
_ProtobufCMessageOptions_default_instance_;
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
x.cc:53:126: error:
=E2=80=98ProtobufCMessageOptionsDefaultTypeInternal{ProtobufCMessageOptions=
DefaultTypeInternal::<unnamed
union>{ProtobufCMessageOptions{google::protobuf::Message{google::protobuf::=
MessageLite{((&
ProtobufCMessageOptions::_ZTV23ProtobufCMessageOptions) + 16),
google::protobuf::internal::InternalMetadata{0}}},
google::protobuf::internal::HasBits<1>{uint32_t [1]()},
google::protobuf::internal::CachedSize{std::atomic<int>{std::__atomic_base<=
int>{0}}},
google::protobuf::internal::ArenaStringPtr{google::protobuf::internal::Tagg=
edStringPtr{0}},
false, true}}}=E2=80=99 is not a constant expression
x.cc:65:124: error: =E2=80=98constinit=E2=80=99 variable
=E2=80=98_ProtobufCFieldOptions_default_instance_=E2=80=99 does not have a =
constant initializer
   65 | PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT
PROTOBUF_ATTRIBUTE_INIT_PRIORITY1 ProtobufCFieldOptionsDefaultTypeInternal
_ProtobufCFieldOptions_default_instance_;
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
x.cc:65:124: error:
=E2=80=98ProtobufCFieldOptionsDefaultTypeInternal{ProtobufCFieldOptionsDefa=
ultTypeInternal::<unnamed
union>{ProtobufCFieldOptions{google::protobuf::Message{google::protobuf::Me=
ssageLite{((&
ProtobufCFieldOptions::_ZTV21ProtobufCFieldOptions) + 16),
google::protobuf::internal::InternalMetadata{0}}},
google::protobuf::internal::HasBits<1>{uint32_t [1]()},
google::protobuf::internal::CachedSize{std::atomic<int>{std::__atomic_base<=
int>{0}}},
false}}}=E2=80=99 is not a constant expression
x.cc: In member function =E2=80=98virtual uint8_t*
ProtobufCMessageOptions::_InternalSerialize(uint8_t*,
google::protobuf::io::EpsCopyOutputStream*) const=E2=80=99:
x.cc:499:1: warning: no return statement in function returning non-void
[-Wreturn-type]
  499 | }
      | ^

$ g++ 12.ii -c -std=3Dc++17
x.cc: In member function =E2=80=98virtual uint8_t*
ProtobufCMessageOptions::_InternalSerialize(uint8_t*,
google::protobuf::io::EpsCopyOutputStream*) const=E2=80=99:
x.cc:499:1: warning: no return statement in function returning non-void
[-Wreturn-type]
  499 | }
      | ^=