bsoncxx version: 3.6.1
found libbson version 
mongocxx version: 3.6.1
found libmongoc version 1.17.2
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY


clang: error: unable to execute command: Terminated
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
Terminated
make[2]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_mocked.dir/options/transaction.cpp.o] Error 143
make[1]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_mocked.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
clang: error: unable to execute command: Terminated
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
Terminated
make[2]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_static.dir/result/bulk_write.cpp.o] Error 143
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_static.dir/result/delete.cpp.o] Terminated
make[2]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_static.dir/result/gridfs/upload.cpp.o] Terminated
make[1]: *** [source_subfolder/src/mongocxx/CMakeFiles/mongocxx_static.dir/all] Terminated
make: *** [all] Error 2
ERROR: Exiting with code: 5