Build succeed and make failed for hpx:cout

[Jiazheng-Yuan]

Expected Behavior

... Please describe the behavior you would have expected.
make would succeed

Actual Behavior

failed
... Please describe the behavior you actually observed.

Scanning dependencies of target example
[ 50%] Building CXX object CMakeFiles/example.dir/main.cpp.o
[100%] Linking CXX executable example
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `final_task(hpx::lcos::future<hpx::util::tuple<hpx::lcos::future<double>, hpx::lcos::future<void> > >)':
main.cpp:(.text+0xb7): undefined reference to `hpx::cout'
/usr/bin/ld: main.cpp:(.text+0xc3): undefined reference to `hpx::iostreams::endl'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `main':
main.cpp:(.text+0x322): undefined reference to `hpx::cout'
/usr/bin/ld: main.cpp:(.text+0x32e): undefined reference to `hpx::iostreams::endl'
/usr/bin/ld: main.cpp:(.text+0x344): undefined reference to `hpx::cout'
/usr/bin/ld: main.cpp:(.text+0x37a): undefined reference to `hpx::iostreams::endl'
/usr/bin/ld: main.cpp:(.text+0x4cb): undefined reference to `hpx::cout'
/usr/bin/ld: main.cpp:(.text+0x501): undefined reference to `hpx::iostreams::endl'
/usr/bin/ld: main.cpp:(.text+0x6d6): undefined reference to `hpx::cout'
/usr/bin/ld: main.cpp:(.text+0x6e2): undefined reference to `hpx::iostreams::endl'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `void hpx::lcos::packaged_action<hpx::iostreams::server::output_stream::write_sync_action, void, false>::do_apply<unsigned int, unsigned long, hpx::iostreams::detail::buffer&>(hpx::naming::address&&, hpx::naming::id_type const&, hpx::threads::thread_priority, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&)':
main.cpp:(.text._ZN3hpx4lcos15packaged_actionINS_9iostreams6server13output_stream17write_sync_actionEvLb0EE8do_applyIJjmRNS2_6detail6bufferEEEEvONS_6naming7addressERKNSB_7id_typeENS_7threads15thread_priorityEDpOT_[_ZN3hpx4lcos15packaged_actionINS_9iostreams6server13output_stream17write_sync_actionEvLb0EE8do_applyIJjmRNS2_6detail6bufferEEEEvONS_6naming7addressERKNSB_7id_typeENS_7threads15thread_priorityEDpOT_]+0xd6): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `bool hpx::apply_p_cb<hpx::iostreams::server::output_stream::write_sync_action, hpx::actions::typed_continuation<void, hpx::util::unused_type>, hpx::util::detail::bound_front<void (*)(boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> >, boost::system::error_code const&, hpx::parcelset::parcel const&), boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> > >, unsigned int, unsigned long, hpx::iostreams::detail::buffer&>(hpx::actions::typed_continuation<void, hpx::util::unused_type>&&, hpx::naming::address&&, hpx::naming::id_type const&, hpx::threads::thread_priority, hpx::util::detail::bound_front<void (*)(boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> >, boost::system::error_code const&, hpx::parcelset::parcel const&), boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> > >&&, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&)':
main.cpp:(.text._ZN3hpx10apply_p_cbINS_9iostreams6server13output_stream17write_sync_actionENS_7actions18typed_continuationIvNS_4util11unused_typeEEENS7_6detail11bound_frontIPFvN5boost13intrusive_ptrINS_4lcos6detail12promise_dataIvEEEERKNSC_6system10error_codeERKNS_9parcelset6parcelEEJSI_EEEJjmRNS1_6detail6bufferEEEEbOT0_ONS_6naming7addressERKNSZ_7id_typeENS_7threads15thread_priorityEOT1_DpOT2_[_ZN3hpx10apply_p_cbINS_9iostreams6server13output_stream17write_sync_actionENS_7actions18typed_continuationIvNS_4util11unused_typeEEENS7_6detail11bound_frontIPFvN5boost13intrusive_ptrINS_4lcos6detail12promise_dataIvEEEERKNSC_6system10error_codeERKNS_9parcelset6parcelEEJSI_EEEJjmRNS1_6detail6bufferEEEEbOT0_ONS_6naming7addressERKNSZ_7id_typeENS_7threads15thread_priorityEOT1_DpOT2_]+0xb0): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::basic_action_impl<void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), &hpx::iostreams::server::output_stream::write_sync, hpx::iostreams::server::output_stream::write_sync_action>::get_action_name[abi:cxx11](unsigned long)':
main.cpp:(.text._ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE15get_action_nameB5cxx11Em[_ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE15get_action_nameB5cxx11Em]+0x5a): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `std::enable_if<hpx::traits::is_continuation<hpx::actions::typed_continuation<void, hpx::util::unused_type>, void>::value, bool>::type hpx::detail::apply_cb_impl<hpx::iostreams::server::output_stream::write_sync_action, hpx::actions::typed_continuation<void, hpx::util::unused_type>, hpx::util::detail::bound_front<void (*)(boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> >, boost::system::error_code const&, hpx::parcelset::parcel const&), boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> > >, unsigned int, unsigned long, hpx::iostreams::detail::buffer&>(hpx::actions::typed_continuation<void, hpx::util::unused_type>&&, hpx::naming::id_type const&, hpx::threads::thread_priority, hpx::util::detail::bound_front<void (*)(boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> >, boost::system::error_code const&, hpx::parcelset::parcel const&), boost::intrusive_ptr<hpx::lcos::detail::promise_data<void> > >&&, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&)':
main.cpp:(.text._ZN3hpx6detail13apply_cb_implINS_9iostreams6server13output_stream17write_sync_actionENS_7actions18typed_continuationIvNS_4util11unused_typeEEENS8_6detail11bound_frontIPFvN5boost13intrusive_ptrINS_4lcos6detail12promise_dataIvEEEERKNSD_6system10error_codeERKNS_9parcelset6parcelEEJSJ_EEEJjmRNS2_6detail6bufferEEEENSt9enable_ifIXsrNS_6traits15is_continuationIT0_vEE5valueEbE4typeEOS11_RKNS_6naming7id_typeENS_7threads15thread_priorityEOT1_DpOT2_[_ZN3hpx6detail13apply_cb_implINS_9iostreams6server13output_stream17write_sync_actionENS_7actions18typed_continuationIvNS_4util11unused_typeEEENS8_6detail11bound_frontIPFvN5boost13intrusive_ptrINS_4lcos6detail12promise_dataIvEEEERKNSD_6system10error_codeERKNS_9parcelset6parcelEEJSJ_EEEJjmRNS2_6detail6bufferEEEENSt9enable_ifIXsrNS_6traits15is_continuationIT0_vEE5valueEbE4typeEOS11_RKNS_6naming7id_typeENS_7threads15thread_priorityEOT1_DpOT2_]+0xb0): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `int hpx::components::get_component_type<hpx::iostreams::server::output_stream>()':
main.cpp:(.text._ZN3hpx10components18get_component_typeINS_9iostreams6server13output_streamEEEiv[_ZN3hpx10components18get_component_typeINS_9iostreams6server13output_streamEEEiv]+0x5): undefined reference to `hpx::traits::component_type_database<hpx::iostreams::server::output_stream, void>::get()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `std::enable_if<!hpx::traits::is_future<void>::value, void>::type hpx::actions::basic_action_impl<void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), &hpx::iostreams::server::output_stream::write_sync, hpx::iostreams::server::output_stream::write_sync_action>::invoke_helper<void, unsigned int, unsigned long, hpx::iostreams::detail::buffer&>(hpx::actions::detail::tag<void>, unsigned long, int, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&)':
main.cpp:(.text._ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE13invoke_helperIvJjmRS6_EEENSt9enable_ifIXntsrNS_6traits9is_futureIT_EE5valueESI_E4typeENS0_6detail3tagISI_EEmiDpOT0_[_ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE13invoke_helperIvJjmRS6_EEENSt9enable_ifIXntsrNS_6traits9is_futureIT_EE5valueESI_E4typeENS0_6detail3tagISI_EEmiDpOT0_]+0x6c): undefined reference to `hpx::iostreams::server::output_stream::write_sync(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&)'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>::transfer_continuation_action<hpx::threads::thread_priority&, unsigned int, unsigned long, hpx::iostreams::detail::buffer&>(hpx::actions::typed_continuation<void, hpx::util::unused_type>&&, hpx::threads::thread_priority&, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&)':
main.cpp:(.text._ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC2IJRNS_7threads15thread_priorityEjmRNS2_6detail6bufferEEEEONS0_18typed_continuationIvNS_4util11unused_typeEEEDpOT_[_ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC5IJRNS_7threads15thread_priorityEjmRNS2_6detail6bufferEEEEONS0_18typed_continuationIvNS_4util11unused_typeEEEDpOT_]+0x7c): undefined reference to `vtable for hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>::transfer_continuation_action<hpx::threads::thread_priority, unsigned int, unsigned long, hpx::iostreams::detail::buffer>(hpx::actions::typed_continuation<void, hpx::util::unused_type>&&, hpx::threads::thread_priority&&, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&&)':
main.cpp:(.text._ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC2IJNS_7threads15thread_priorityEjmNS2_6detail6bufferEEEEONS0_18typed_continuationIvNS_4util11unused_typeEEEDpOT_[_ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC5IJNS_7threads15thread_priorityEjmNS2_6detail6bufferEEEEONS0_18typed_continuationIvNS_4util11unused_typeEEEDpOT_]+0x7c): undefined reference to `vtable for hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::detail::register_action<hpx::iostreams::server::output_stream::write_sync_action>::register_action()':
main.cpp:(.text._ZN3hpx7actions6detail15register_actionINS_9iostreams6server13output_stream17write_sync_actionEEC2Ev[_ZN3hpx7actions6detail15register_actionINS_9iostreams6server13output_stream17write_sync_actionEEC5Ev]+0x22): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>::transfer_continuation_action()':
main.cpp:(.text._ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC2Ev[_ZN3hpx7actions28transfer_continuation_actionINS_9iostreams6server13output_stream17write_sync_actionEEC5Ev]+0x1c): undefined reference to `vtable for hpx::actions::transfer_continuation_action<hpx::iostreams::server::output_stream::write_sync_action>'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::transfer_action<hpx::iostreams::server::output_stream::write_sync_action>::transfer_action()':
main.cpp:(.text._ZN3hpx7actions15transfer_actionINS_9iostreams6server13output_stream17write_sync_actionEEC2Ev[_ZN3hpx7actions15transfer_actionINS_9iostreams6server13output_stream17write_sync_actionEEC5Ev]+0x1b): undefined reference to `vtable for hpx::actions::transfer_action<hpx::iostreams::server::output_stream::write_sync_action>'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `std::enable_if<!hpx::traits::is_future<void>::value, void>::type hpx::actions::basic_action_impl<void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), void (hpx::iostreams::server::output_stream::*)(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&), &hpx::iostreams::server::output_stream::write_sync, hpx::iostreams::server::output_stream::write_sync_action>::invoke_helper<void, unsigned int, unsigned long, hpx::iostreams::detail::buffer>(hpx::actions::detail::tag<void>, unsigned long, int, unsigned int&&, unsigned long&&, hpx::iostreams::detail::buffer&&)':
main.cpp:(.text._ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE13invoke_helperIvJjmS6_EEENSt9enable_ifIXntsrNS_6traits9is_futureIT_EE5valueESH_E4typeENS0_6detail3tagISH_EEmiDpOT0_[_ZN3hpx7actions17basic_action_implIMNS_9iostreams6server13output_streamEFvjmRKNS2_6detail6bufferEESA_XadL_ZNS4_10write_syncEjmS8_EENS4_17write_sync_actionEE13invoke_helperIvJjmS6_EEENSt9enable_ifIXntsrNS_6traits9is_futureIT_EE5valueESH_E4typeENS0_6detail3tagISH_EEmiDpOT0_]+0x6c): undefined reference to `hpx::iostreams::server::output_stream::write_sync(unsigned int, unsigned long, hpx::iostreams::detail::buffer const&)'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `hpx::actions::transfer_base_action<hpx::iostreams::server::output_stream::write_sync_action>::get_action_name() const':
main.cpp:(.text._ZNK3hpx7actions20transfer_base_actionINS_9iostreams6server13output_stream17write_sync_actionEE15get_action_nameEv[_ZNK3hpx7actions20transfer_base_actionINS_9iostreams6server13output_stream17write_sync_actionEE15get_action_nameEv]+0xd): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
/usr/bin/ld: CMakeFiles/example.dir/main.cpp.o: in function `unsigned int hpx::actions::detail::get_action_id<hpx::iostreams::server::output_stream::write_sync_action>()':
main.cpp:(.text._ZN3hpx7actions6detail13get_action_idINS_9iostreams6server13output_stream17write_sync_actionEEEjv[_ZN3hpx7actions6detail13get_action_idINS_9iostreams6server13output_stream17write_sync_actionEEEjv]+0x33): undefined reference to `char const* hpx::actions::detail::get_action_name<hpx::iostreams::server::output_stream::write_sync_action>()'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/example.dir/build.make:103: example] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/example.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

Steps to Reproduce the Problem

... Please be as specific as possible while describing how to reproduce your problem.
This is what I have in my CMakeList.txt, I am trying to use pybind11 with hpx

cmake_minimum_required(VERSION 3.0)
project(example CXX)
find_package(HPX REQUIRED)
find_package(pybind11 REQUIRED)  
add_executable(example main.cpp)
target_link_libraries(example hpx)
hpx_setup_target(example)
target_link_libraries(example pybind11::embed)

instruction used

cmake -DPYTHON_EXECUTABLE=$python3_location -Dpybind11_DIR=$pybind_location -DHPX_DIR=$hpx_install_location/lib/cmake/HPX -DCMAKE_PREFIX_PATH=$hpx_install_location ..

C++ code used(example from documentation)

#include <hpx/hpx_main.hpp>
#include <hpx/include/iostreams.hpp>
#include <hpx/include/lcos.hpp>
#include <hpx/include/parallel_generate.hpp>
#include <hpx/include/parallel_sort.hpp>
#include<pybind11/embed.h>

#include <random>
#include <vector>

void final_task(hpx::future<hpx::util::tuple<hpx::future<double>, hpx::future<void>>>)
{
    hpx::cout << "in final_task" << hpx::endl;
}

int main(int, char**)
{
    // A function can be launched asynchronously. The program will not block
    // here until the result is available.
    hpx::future<int> f = hpx::async([]() { return 42; });
    hpx::cout << "Just launched a task!" << hpx::endl;

    // Use get to retrieve the value from the future. This will block this task
    // until the future is ready, but the HPX runtime will schedule other tasks
    // if there are tasks available.
    hpx::cout << "f contains " << f.get() << hpx::endl;

    // Let's launch another task.
    hpx::future<double> g = hpx::async([]() { return 3.14; });

    // Tasks can be chained using the then method. The continuation takes the
    // future as an argument.
    hpx::future<double> result = g.then([](hpx::future<double>&& gg)
        {
            // This function will be called once g is ready. gg is g moved
            // into the continuation.
            return gg.get() * 42.0 * 42.0;
        });

    // You can check if a future is ready with the is_ready method.
    hpx::cout << "Result is ready? " << result.is_ready() << hpx::endl;

    // You can launch other work in the meantime. Let's sort a vector.
    std::vector<int> v(1000000);

    // We fill the vector synchronously and sequentially.
    hpx::parallel::generate(hpx::parallel::execution::seq,
                  std::begin(v), std::end(v), &std::rand);

    // We can launch the sort in parallel and asynchronously.
    hpx::future<void> done_sorting =
        hpx::parallel::sort(
            hpx::parallel::execution::par( // In parallel.
                hpx::parallel::execution::task), // Asynchronously.
            std::begin(v),
            std::end(v));

    // We launch the final task when the vector has been sorted and result is
    // ready using when_all.
    auto all = hpx::when_all(result, done_sorting).then(&final_task);

    // We can wait for all to be ready.
    all.wait();

    // all must be ready at this point because we waited for it to be ready.
    hpx::cout <<
        (all.is_ready() ? "all is ready!" : "all is not ready...") << hpx::endl;

    return hpx::finalize();
}

output for build

-- The CXX compiler identification is GNU 8.2.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- The C compiler identification is GNU 8.2.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- WARNING: HPX will perform poorly without tcmalloc or jemalloc. See docs for more info.
-- Using system allocator.
-- Found PythonInterp: /home/jyuan18/shared/jiazheng/venv3.7/bin/python3 (found version "3.7.1") 
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.7m.so
-- Performing Test HAS_CPP14_FLAG
-- Performing Test HAS_CPP14_FLAG - Success
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jyuan18/shared/jiazheng/test_dir/hpx_build/deeper

Build would succeed, but make would fail. If i turn off all the iostream it would run normally. I am
new to hpx, don't really know what happened. I was trying to use hpx with pybind11.

Specifications

... Please describe your environment

• HPX Version: hpx_1.2.0
• Platform (compiler, OS):g++ (Debian 8.2.0-9) 8.2.0

[msimberg]

Thanks for the report. hpx::cout is provided by a separate library/component and has to be linked to explicitly. To do so you can change your hpx_setup_target(example) to hpx_setup_target(example COMPONENT_DEPENDENCIES iostreams) (docs here).

Like you said using std::cout works as well, but I'd still recommend you use hpx::cout for two reasons. First, hpx::cout will do the actual writing to std::cout on a separate thread which means that hpx::cout will never block our scheduler. Second, hpx::cout will redirect output from multiple localities/nodes to the main locality.

[Jiazheng-Yuan]

Thanks.It works well now!