undefined reference to boost::chrono::system_clock::now()

[tianzhuqiao]

Thanks for the great project. I am following the doc to compile the code in ubuntu. Everything works fine except that it shows the following link error

undefined reference to boost::chrono::system_clock::now()

And I checked the "./CMakeFiles/nmos-cpp-node.dir/link.txt", looks like for some reason, libboost_chrono is not there. If I manually add the /usr/local/lib/libboost_chrono.so.1.83.0 there, it compiles fine.

I am not sure why only libboost_chrono is missed? Did I miss some configuration? Thanks!

/usr/bin/c++ -O3 -DNDEBUG "CMakeFiles/nmos-cpp-node.dir/nmos-cpp-node/main.cpp.o" "CMakeFiles/nmos-cpp-node.dir/nmos-cpp-node/node_implementation.cpp.o" -o nmos-cpp-node -Wl,-rpath,/usr/local/lib: libnmos-cpp.a libnmos_is04_schemas.a libnmos_is05_schemas.a libnmos_is08_schemas.a libnmos_is09_schemas.a libnmos_is10_schemas.a libnmos_is12_schemas.a libnmos_is14_schemas.a libmdns.a /usr/lib/x86_64-linux-gnu/libdns_sd.so /usr/lib/x86_64-linux-gnu/libavahi-client.so /usr/lib/x86_64-linux-gnu/libavahi-common.so /usr/lib/x86_64-linux-gnu/libdbus-1.so /usr/lib/x86_64-linux-gnu/libssl.so /usr/lib/x86_64-linux-gnu/libcrypto.so /usr/local/lib/libcpprest.so.2.10 /usr/local/lib/libboost_system.so.1.83.0 /usr/local/lib/libboost_date_time.so.1.83.0 /usr/local/lib/libboost_regex.so.1.83.0 /usr/local/lib/libboost_thread.so.1.83.0 libjson_schema_validator.a -lresolv -lstdc++fs

[lo-simon]

Hi @tianzhuqiao

We appreciate your interest in nmos-cpp. I have just checked my build; in my environment (Ubuntu 24.04), the libboost_chrono.so file is linked to nmos-cpp-node. Could you please show us which Ubuntu you are using, the CMake instructions for the cpprestsdk, and the nmos-cpp?

Although in my CMake instructions are slightly different to the Dependencies.md, I don't think it matters.

Here are my CMake instructions for them

cpprestsdk

cmake .. \
  -DCMAKE_BUILD_TYPE:STRING="Release" \
  -DWERROR:BOOL="0" \
  -DBUILD_SAMPLES:BOOL="0" \
  -DBUILD_TESTS:BOOL="0" \
  -DBoost_USE_STATIC_LIBS:BOOL="1" \
  -DBOOST_INCLUDEDIR:PATH="/mnt/d/Projects/boost_1_83_0" \
  -DBOOST_LIBRARYDIR:PATH="/mnt/d/Projects/boost_1_83_0/lib"

nmos-cpp

cmake .. \
  -DCMAKE_BUILD_TYPE:STRING="Release" \
  -DWEBSOCKETPP_INCLUDE_DIR:PATH="/mnt/d/Projects/cpprestsdk/Release/libs/websocketpp" \
  -DNMOS_CPP_USE_SUPPLIED_JSON_SCHEMA_VALIDATOR:BOOL="1" \
  -DNMOS_CPP_USE_SUPPLIED_JWT_CPP:BOOL="1" \
  -DNMOS_CPP_BUILD_EXAMPLES:BOOL="1" \
  -DBOOST_INCLUDEDIR:PATH="/mnt/d/Projects/boost_1_83_0" \
  -DBOOST_LIBRARYDIR:PATH="/mnt/d/Projects/boost_1_83_0/lib"

nmos-cpp-node link.txt

/usr/bin/c++ -O3 -DNDEBUG "CMakeFiles/nmos-cpp-node.dir/nmos-cpp-node/main.cpp.o" "CMakeFiles/nmos-cpp-node.dir/nmos-cpp-node/node_implementation.cpp.o" -o nmos-cpp-node -Wl,-rpath,/usr/local/lib:/mnt/d/Projects/boost_1_83_0/lib: libnmos-cpp.a libnmos_is04_schemas.a libnmos_is05_schemas.a libnmos_is08_schemas.a libnmos_is09_schemas.a libnmos_is10_schemas.a libnmos_is12_schemas.a libnmos_is14_schemas.a libmdns.a /usr/lib/x86_64-linux-gnu/libdns_sd.so /usr/lib/x86_64-linux-gnu/libavahi-client.so /usr/lib/x86_64-linux-gnu/libavahi-common.so /usr/lib/x86_64-linux-gnu/libdbus-1.so /usr/lib/x86_64-linux-gnu/libssl.so /usr/lib/x86_64-linux-gnu/libcrypto.so /usr/local/lib/libcpprest.so.2.10 /mnt/d/Projects/boost_1_83_0/lib/libboost_system.so /mnt/d/Projects/boost_1_83_0/lib/libboost_date_time.so /mnt/d/Projects/boost_1_83_0/lib/libboost_regex.so /mnt/d/Projects/boost_1_83_0/lib/libboost_thread.so /mnt/d/Projects/boost_1_83_0/lib/libboost_chrono.so /mnt/d/Projects/boost_1_83_0/lib/libboost_atomic.so libjson_schema_validator.a -lresolv -lstdc++fs

[tianzhuqiao]

Thanks @lo-simon. My ubuntu is 24.04.01 (WSL). I follow the instruction in Dependencies.md,

cpprestsdk (tried both Debug and Release, no difference)

cmake .. \
  -DCMAKE_BUILD_TYPE:STRING="Debug" \
  -DWERROR:BOOL="0" \
  -DBUILD_SAMPLES:BOOL="0" \
  -DBUILD_TESTS:BOOL="0"

nmos-cpp

cmake .. \
  -DCMAKE_BUILD_TYPE:STRING="Debug" \
  -DWEBSOCKETPP_INCLUDE_DIR:PATH="/home/ben/cpprestsdk/Release/libs/websocketpp" \
  -DNMOS_CPP_USE_SUPPLIED_JSON_SCHEMA_VALIDATOR:BOOL="1" \
  -DNMOS_CPP_USE_SUPPLIED_JWT_CPP:BOOL="1"

And I also tried your command by adding the following option

  -DBOOST_INCLUDEDIR:PATH="/home/ben/boost_1_83_0" \
  -DBOOST_LIBRARYDIR:PATH="/home/ben/boost_1_83_0/lib"

but looks like they are ignored by cmake

CMake Warning:
  Manually-specified variables were not used by the project:

    BOOST_INCLUDEDIR
    BOOST_LIBRARYDIR