C++ link error when using "repeated" with a custom message

[Xavier Raemy]

After hours of debugging, I have the following minimalist .proto file:

syntax = "proto3";

message PbCaptureResult {

bool checkedValid = 1;

}

message PbCaptureResultSequence {

PbCaptureResult captureResults = 1;

}

It compiles and links successfully. But, if I add a "repeated" like:

syntax = "proto3";

message PbCaptureResult {

bool checkedValid = 1;

}

message PbCaptureResultSequence {

repeated PbCaptureResult captureResults = 1;

}

then I have a link error and get:

cmd.exe /C "cd . && C:\Android\Sdk\ndk\22.0.6917172\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android29 --gcc-toolchain=C:/Android/Sdk/ndk/22.0.6917172/toolchains/llvm/prebuilt/windows-x86_64 --sysroot=C:/Android/Sdk/ndk/22.0.6917172/toolchains/llvm/prebuilt/windows-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security  -Wno-deprecated-declarations -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -Wl,--build-id=sha1 -Wl,--fatal-warnings -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libnative-lib.so -o libnative-lib.so @CMakeFiles/native-lib.rsp  && cd ."

ld: error: undefined symbol: google::protobuf::internal::RepeatedPtrFieldBase::AddOutOfLineHelper(void*)

>>> referenced by repeated_field.h:1767 (../../../../imported-lib/include\google/protobuf\repeated_field.h:1767)

>>>               CMakeFiles/native-lib.dir/src/main/cpp/authenticationLib/CaptureResultSequence.pb.cc.o:(google::protobuf::RepeatedPtrField<PbCaptureResult>::TypeHandler::Type* google::protobuf::internal::RepeatedPtrFieldBase::Add<google::protobuf::RepeatedPtrField<PbCaptureResult>::TypeHandler>(google::protobuf::RepeatedPtrField<PbCaptureResult>::TypeHandler::Type*))

clang++: error: linker command failed with exit code 1 (use -v to see invocation)

If the "repeated" come before a "standard type" such as string then it compiles:

syntax = "proto3";

message PbCaptureResult {

bool checkedValid = 1;

}

message PbCaptureResultSequence {

repeated string captureResults = 1;

}

it's only if I try to repeat a custom message that I have an issue.

But in the protobuf website I found the following example:

message SearchResponse {

  repeated Result results = 1;

}

message Result {

  string url = 1;

  string title = 2;

  repeated string snippets = 3;

} 

I have put the example as is in my .proto file and it failed to compile with the same linking error. I concluded that it's not a .proto syntax problem.

It's protobuf 3.15.5.

The generating command is: ./bin/protoc.exe --cpp_out=.. CaptureResultSequence.proto

I am static linking against libprotobuf.a (not libprotobuf-lite.a)

I have cross compiled protobuf myself

I initially thought that the issue was related to linking, but for me it doesn't explain why I can link without "repeated" but can't link with it.

[Adam Cozzette]

I suspect that your build is somehow mixing multiple protobuf versions. For C++, the version of protoc used to generate code must exactly match the libprotobuf library version, and it's also important that the headers you compile against are the same version as the library you link against. RepeatedPtrFieldBase::AddOutOfLineHelper was added fairly recently, so I think your build is probably using a new version of protoc and new headers, but still somehow linking against an old version of libprotobuf.

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