Failed to Build Visual Stuido C++ Project with .pb.h and .pb.cc

[CodeFish711]

What version of protobuf and what language are you using? Version: protobuf-3.19.4 Language: C++ 14

What operating system (Linux, Windows, ...) and version? Windows 10 What runtime / compiler are you using (e.g., python version or gcc version) MSVC 19.29.30141.0 CMake 3.22.0 -- Configure BUILD_SHARED_LIBS

What did you do? Steps to reproduce the behavior:

1. build Release x64 protobuf.sln using Visual Studio 2019

libprotobuf.dll libprotobuf.lib libprotoc.dll libprotoc.lib protoc.exe

2. Write my test.proto

syntax = "proto3";

package test;

message Person {
  optional string name = 1;
  optional int32 id = 2;
  optional string email = 3;
}

3. run .\protoc.exe --cpp_out=./ .\test.proto

test.pb.h test.pb.cc

4. Create Simple Hello_World ConsoleApplication using using Visual Studio 2019 Release x64

add src test.pb.h and test.pb.cc add link lirary libprotobuf.lib and libprotoc.lib add include dir google copy DLL libprotobuf.dll and libprotoc.dll #include "test.pb.h"

5. Build

What did you expect to see build suceess What did you see instead?

Error LNK2001 unresolved external symbol "class google::protobuf::internal::ExplicitlyConstructed<class std::basic_string<char,struct std::char_traits,class std::allocator > > google::protobuf::internal::fixed_address_empty_string" (?fixed_address_empty_string@internal@protobuf@google@@3V?$ExplicitlyConstructed@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@123@A)

And once I opened "test.pb.h" in vs editor, hundreds of errors occured e.g some macro marked error PROTOBUF_NAMESPACE_OPEN Error (active) E0077 this declaration has no storage class or type specifier

::PROTOBUF_NAMESPACE_ID:: Error (active) E0276 name followed by '::' must be a class or namespace name

Furthermore, if import "google/protobuf/any.proto";

Error LNK2001 unresolved external symbol "struct google::protobuf::AnyDefaultTypeInternal google::protobuf::Any_default_instance" (?Any_default_instance@protobuf@google@@3UAnyDefaultTypeInternal@12@A)

How Can I correctly build? Thanks a lot!!!

[ralucado]

Having the same issue, our project builds fine on Linux but it is getting a lot of errors from the protobuf macros on Visual Studio 2019

[an-archi]

build protobuf x64 with vs /MDd will get rid of this trouble

[vasdev8]

changing the "C++ Language Standard" to "ISO C++ 17 Standard (/std:c++17)" resolved the header issues "Error (active) E0077". Other issues can be resolved using the solution mentioned above by @sigaaron.

[harryqk]

same problem, but can build, run without error

[KuiLeiZS]

same problem,but my OS is Ubuntu 18.04 And once I opened "test.pb.h" in vs code, hundreds of errors occured e.g some macro marked error PROTOBUF_NAMESPACE_OPEN Error (active) E0077 this declaration has no storage class or type specifier

::PROTOBUF_NAMESPACE_ID:: Error (active) E0276 name followed by '::' must be a class or namespace name How Can I correctly build? Thanks a lot!!!!!!!!!!!!!!!!!!

[nbreen]

I am having the same issue. Compiling with Visual Studio 2022. I've tried the suggestions by @vasdev8 and @sigaaron with no luck

[imadourabi]

Same issue here in VS 2022. However, when I open the project as a folder (not as solution), it seems likely to work, although, this is not the desired solution for this issue.

[HMS-Yukikaze]

1. I have same issue in vs2019 when i build grpc examples.
2. I try to enable grpc_MSVC_STATIC_RUNTIME ,protobuf_MSVC_STATIC_RUNTIME,Cares_MSVC_STATIC_RUNTIME in cmake configuration，then I try to generate a static lib by”.grpc.pb.cc“、”.grpc.pb.h“、”.pb.cc“、”.pb.h“rather than dynamic library.
3. although it still have errors such as E0077,but it build success 。
4. According to the header file "<google/protobuf/port_def.inc>",The definitions in this file are intended to be portable across Clang,GCC, and MSVC. Function-like macros are usable without an #ifdef guard. Syntax macros (for example, attributes) are always defined, although they may be empty.
5. maybe just the IntelliSense error?

[onlyou2030]

Same issue in VS2022.

[historyliao]

changing the "C++ Language Standard" to "ISO C++ 17 Standard (/std:c++17)" resolved the header issues "Error (active) E0077". Other issues can be resolved using the solution mentioned above by @sigaaron.

changing standard to c++17 successfully clears errors

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