Hi,

Seems like you are missing the dependencies.

You still need to run ./install.sh from the installation instructions before building.

Hi,

Seems like you are missing the dependencies.

You still need to run ./install.sh from the installation instructions before building.

Solved!

I did run into another error later on that I managed to solve with the help of Bing Chat.
When running the following command:
cd ../open_spiel/examples
clang++ -I${HOME}/open_spiel -I${HOME}/open_spiel/open_spiel/abseil-cpp -L${HOME}/open_spiel/build -lopen_spiel -std=c++17 -o shared_library_example shared_library_example.cc

I ran into the following error:
/usr/bin/ld: /tmp/ccBICDuM.o: in function main': shared_library_example.cc:(.text+0x232): undefined reference to open_spiel::RegisteredGamesabi:cxx11'
/usr/bin/ld: shared_library_example.cc:(.text+0x374): undefined reference to open_spiel::LoadGame(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /usr/bin/ld: shared_library_example.cc:(.text+0x5d4): undefined reference to open_spiel::SampleAction(std::vector<std::pair<long, double>, std::allocator<std::pair<long, double> > > const&, absl::lts_20211102::BitGenRef)'
/usr/bin/ld: shared_library_example.cc:(.text+0x919): undefined reference to `open_spiel::State::ApplyActions(std::vector<long, std::allocator > const&)'
collect2: error: ld returned 1 exit status

Bing chat told me the -lopen_spiel option should be specified after the object files or source files to ensure that the linker can find the definitions for the functions used in your code. After running the updated command:
g++ -I${HOME}/open_spiel -I${HOME}/open_spiel/open_spiel/abseil-cpp -std=c++17 -o shared_library_example shared_library_example.cc -L${HOME}/open_spiel/build -lopen_spiel
The code worked and I was succesfully able to run the example. Please do note that I used g++ instead of clang++. Do you think you could include running the install.sh step and this updated command in the https://openspiel.readthedocs.io/en/latest/library.html page?

Ok, great. The -lopen_spiel was already in the compilation command on the page here: https://github.com/deepmind/open_spiel/blob/master/docs/library.md#compiling-and-running-the-example

Sure, we will add a mention of installing the dependencies. Thanks!

The -lopen_spiel is indeed mentioned but I ran into an error when it is in the middle of the command, when moving it to the end of the command it did work. This might be because I am using g++ instead, I am not sure.

Ah, yes, it seems like it is related to g++/gcc: https://stackoverflow.com/questions/3363398/g-linking-order-dependency-when-linking-c-code-to-c-code

I had forgotten about that. So I've re-ordered the order in the example to match yours.