Building grpc 1.46.3

[Aleh Linkin]

Hi, I'd like to clarify one moment about building. If my project uses grpc and I build my project with c++17. Should I build grpc with c++17 or it is not necessary?

I see that after building grpc 1.46.3 and abseil with c++17 I can't after that build my project and got some under references like

```

 undefined reference to `google::protobuf::Empty::Empty(google::protobuf::Arena*)'
undefined reference to `grpc::ServerContextBase::MaybeMarkCancelledOnRead()'
undefined reference to `google::protobuf::internal::VerifyUTF8(google::protobuf::StringPiece, char const*)'
undefined reference to `google::protobuf::StringPiece::LogFatalSizeTooBig(unsigned long, char const*)'
undefined reference to `bool absl::lts_20210324::str_format_internal::FormatArgImpl::Dispatch<std::basic_string_view<char, std::char_traits<char> > >(absl::lts_20210324::str_format_internal::FormatArgImpl::Data, absl::lts_20210324::str_format_internal::FormatConversionSpecImpl, void*)'undefined reference to `absl::lts_20210324::str_format_internal::FormatPack(absl::lts_20210324::str_format_internal::UntypedFormatSpecImpl, absl::lts_20210324::Span<absl::lts_20210324::str_format_internal::FormatArgImpl const>)'
```

and some others.

Sincerely, Oleg

[veb...@google.com]

Hey Oleg, 

I think this is not because you're using C++17 but because your build might mixed up C++11 (or 14) and C++17 when building all components that gRPC needs.

Internally gRPC is being built with C++17 so it shouldn't have a build issue. 

If you think there is something gRPC needs to fix it, please give us a list of commands to build it. (preferably using a docker image)

Regards,

Esun.

[Aleh Linkin]

I have found that to make correct c++17 build we should set -DABSL_PROPAGATE_CXX_STD=OFF and -DCMAKE_CXX_STANDARD=1. -DABSL_PROPAGATE_CXX_STD=OFF is mandatory because in other case absl forces to use c++11

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[Aleh Linkin]

-DCMAKE_CXX_STANDARD=17, sorry

[Esun Kim]

Thanks Aleh for the update. 

As you see, when building gRPC and all other dependencies, configurations such as C++ version should be the same. Hence, your fix sounds right to me.

--

Regards,

Esun.