Getting undefined reference to `opentelemetry::v0::sdk::resource::Resource::Create while all libraries are there

Hi,

I have compiled the opentelemetry-cpp libraries as shared and installed them on Ubuntu 18.04.

Unfortunately I did not find yet why I get the following error when I am trying to compile my library against them:

undefined reference to opentelemetry::v0::sdk::resource::Resource::Create(std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > > const&)

The symbol seems to be in place:

nm -gDC libopentelemetry_resources.so | grep Create
0000000000007820 T opentelemetry::v0::sdk::resource::Resource::Create(std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > > const&)

[lalitb]

Works for me - this is link error, so please ensure you are passing this library as link option to compiler/linker:

$ ls /usr/local/lib/libopentelemetry_resources.so
/usr/local/lib/libopentelemetry_resources.so
$ g++ ./resource_test.cpp
/usr/bin/ld: /tmp/ccVGz9Id.o: in function `main':
resource_test.cpp:(.text+0x160): undefined reference to `opentelemetry::v0::sdk::resource::Resource::Create(std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > > const&)'
collect2: error: ld returned 1 exit status
$ g++ ./resource_test.cpp -lopentelemetry_resources
$ ldd ./a.out
        linux-vdso.so.1 (0x00007ffe971c5000)
        libopentelemetry_resources.so => /usr/local/lib/libopentelemetry_resources.so (0x00007f6aa8bd8000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f6aa89e7000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f6aa89cc000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f6aa87da000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f6aa868b000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f6aa8ccc000)
$

Works for me - this is link error, so please ensure you are passing this library as link option to compiler/linker:

labhas@MININT-47CLAOB:/tmp$ ls /usr/local/lib/libopentelemetry_resources.so
/usr/local/lib/libopentelemetry_resources.so
labhas@MININT-47CLAOB:/tmp$ g++ ./resource_test.cpp
/usr/bin/ld: /tmp/ccVGz9Id.o: in function `main':
resource_test.cpp:(.text+0x160): undefined reference to `opentelemetry::v0::sdk::resource::Resource::Create(std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, opentelemetry::v0::nostd::variant<bool, int, unsigned int, long, unsigned long, double, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<bool, std::allocator<bool> >, std::vector<int, std::allocator<int> >, std::vector<unsigned int, std::allocator<unsigned int> >, std::vector<long, std::allocator<long> >, std::vector<unsigned long, std::allocator<unsigned long> >, std::vector<double, std::allocator<double> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > > const&)'
collect2: error: ld returned 1 exit status
labhas@MININT-47CLAOB:/tmp$ g++ ./resource_test.cpp -lopentelemetry_resources
labhas@MININT-47CLAOB:/tmp$

Thank you very much for the reply. I compared the actual symbol missing and the actual symbol in the library it seems to be related to WITH_STL cmake definition.

My library is looking for opentelemetry::v0::nostd::variant for example but the opentelemetry_resources library was compiled with the -DWITH_STL=ON and it uses std::variant` for a parameter type. Same goes for other parameters as well.

The library is in the path alright. Thanks again!

[lalitb]

Good catch. As you are trying Resource API, just to let you know - the necessary sdk changes to inject resources to exporters are not yet complete, and under review (#580) for some design discussions. You may want to revisit it in couple of weeks if you want to try out that.

Right now I am getting a POC ready for distributed tracing with OpenTelemetry and the ELK Stack. If that works I am OK for now. I understand the libraries are under development.

Awesome stuff here. I am sure it will help us a lot understand the performance.

I turned off WITH_STL and it did compile in the end just fine; but in order to compile it with STL I had to add the following definitions in my CMakeLists.txt:

add_definitions(-DHAVE_CPP_STDLIB -DHAVE_GSL)

because the headers under /usr/local/include/opentelemetry are depending on them.

Since the types to be used are configured with CMake and the binaries include the correct types, this tells me a library using the opentelemetry headers should not require these definitions (-DHAVE_CPP_STDLIB -DHAVE_GSL) but instead the types included in the installed opentelemetry headers should match the types compiled inside the installed opentelemetry binaries.

@lalitb thanks for the help really! I am closing this