I am trying to just do a simple example for protobuf and I am having trouble linking. I haven't found anything worthwhile on here.
For starters, I have a very barebones .proto file
tempproj.proto
package tempproj;
message name
{
required string first = 1;
required string last = 2;
}
I am building it via:
$ protoc --cpp_out=. tempproj.proto
It is generating tempproj.pb.h and tempproj.pb.cc. I am assuming the generated code is correct.
I then have a file, main.cpp, which is barebones as well
#include "tempproj.bh.h"
int main(int argc, char** argv)
{
return 0;
}
I then compile it via:
$ g++ -std=gnu++14 -m64 -lprotobuf main.cpp tempproj.pb.cc
And the output is
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `protobuf_tempproj_2eproto::protobuf_AssignDescriptors()':
tempproj.pb.cc:(.text+0xf6): undefined reference to `google::protobuf::internal::AssignDescriptors(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, google::protobuf::internal::MigrationSchema const*, google::protobuf::Message const* const*, unsigned int const*, google::protobuf::MessageFactory*, google::protobuf::Metadata*, google::protobuf::EnumDescriptor const**, google::protobuf::ServiceDescriptor const**)'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `protobuf_tempproj_2eproto::AddDescriptorsImpl()':
tempproj.pb.cc:(.text+0x1a5): undefined reference to `google::protobuf::MessageFactory::InternalRegisterGeneratedFile(char const*, void (*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&))'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `tempproj::name::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const':
tempproj.pb.cc:(.text+0xcb9): undefined reference to `google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, google::protobuf::io::CodedOutputStream*)'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: tempproj.pb.cc:(.text+0xd24): undefined reference to `google::protobuf::internal::WireFormatLite::WriteStringMaybeAliased(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, google::protobuf::io::CodedOutputStream*)'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `google::protobuf::internal::GetEmptyStringAlreadyInited[abi:cxx11]()':
tempproj.pb.cc:(.text._ZN6google8protobuf8internal27GetEmptyStringAlreadyInitedB5cxx11Ev[_ZN6google8protobuf8internal27GetEmptyStringAlreadyInitedB5cxx11Ev]+0x5): undefined reference to `google::protobuf::internal::fixed_address_empty_string[abi:cxx11]'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `google::protobuf::internal::WireFormatLite::ReadString(google::protobuf::io::CodedInputStream*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)':
tempproj.pb.cc:(.text._ZN6google8protobuf8internal14WireFormatLite10ReadStringEPNS0_2io16CodedInputStreamEPNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN6google8protobuf8internal14WireFormatLite10ReadStringEPNS0_2io16CodedInputStreamEPNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x1f): undefined reference to `google::protobuf::internal::WireFormatLite::ReadBytes(google::protobuf::io::CodedInputStream*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o: in function `google::protobuf::internal::WireFormatLite::WriteStringToArray(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned char*)':
tempproj.pb.cc:(.text._ZN6google8protobuf8internal14WireFormatLite18WriteStringToArrayEiRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPh[_ZN6google8protobuf8internal14WireFormatLite18WriteStringToArrayEiRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPh]+0x39): undefined reference to `google::protobuf::io::CodedOutputStream::WriteStringWithSizeToArray(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned char*)'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o:(.rodata._ZTVN8tempproj4nameE[_ZTVN8tempproj4nameE]+0x20): undefined reference to `google::protobuf::Message::GetTypeName[abi:cxx11]() const'
/opt/rh/gcc-toolset-11/root/usr/bin/ld: /tmp/ccj7rSmF.o:(.rodata._ZTVN8tempproj4nameE[_ZTVN8tempproj4nameE]+0x58): undefined reference to `google::protobuf::Message::InitializationErrorString[abi:cxx11]() const'
collect2: error: ld returned 1 exit status
The paths are in normal places /usr/include for headers /usr/lib64 for libs.
Even when I explicitly set the lib path a la
$ g++ -std=gnu++14 -m64 -L/usr/lib64 -lprotobuf main.cpp tempproj.pb.cc
I get the same results. I am rather stumped at this point.
FWIW I am using EL8, gcc-toolkit-11 (g++ 11.2.1)
edit: found the fix I believe: build with -D_GLIBCXX_USE_CXX11_ABI=0 (https://gcc.gnu.org/gcc-5/changes.html#libstdcxx)
