failed to compile on mac os

[fangaohz]

I tried to install lightGBM on mac and failed to compile it.

`
Scanning dependencies of target lightgbm
Scanning dependencies of target _lightgbm
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[ 98%] Linking CXX executable ../lightgbm
Undefined symbols for architecture x86_64:
"_GOMP_atomic_end", referenced from:
LightGBM::RegressionL2loss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::Init(LightGBM::Metadata const&, int) [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropy::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropyLambda::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::LeafSplits::Init(float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
LightGBM::LeafSplits::Init(int, LightGBM::DataPartition const*, float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
...
"_GOMP_atomic_start", referenced from:
LightGBM::RegressionL2loss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::Init(LightGBM::Metadata const&, int) [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropy::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropyLambda::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::LeafSplits::Init(float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
LightGBM::LeafSplits::Init(int, LightGBM::DataPartition const*, float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
...
"_GOMP_loop_end_nowait", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_loop_nonmonotonic_guided_next", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_loop_nonmonotonic_guided_start", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_parallel", referenced from:
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) in application.cpp.o
std::_Function_handler<void (int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&), LightGBM::Predictor::Predict(char const*, char const*, bool)::{lambda(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&)#2}>::_M_invoke(std::_Any_data const&, int&&, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&) in application.cpp.o
LightGBM::Application::Predict() in application.cpp.o
LightGBM::GBDT::InitPredict(int, bool) in boosting.cpp.o
LightGBM::RF::AddValidDataset(LightGBM::Dataset const*, std::vector<LightGBM::Metric const*, std::allocator<LightGBM::Metric const*> > const&) in boosting.cpp.o
LightGBM::RF::RollbackOneIter() in boosting.cpp.o
LightGBM::GOSS::Bagging(int) in boosting.cpp.o
...
"_omp_get_num_threads", referenced from:
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) [clone ._omp_fn.0] in application.cpp.o
LightGBM::Predictor::Predict(char const*, char const*, bool)::{lambda(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&)#2}::operator()(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&) const [clone ._omp_fn.0] in application.cpp.o
LightGBM::Application::Predict() [clone ._omp_fn.0] in application.cpp.o
LightGBM::GBDT::InitPredict(int, bool) [clone ._omp_fn.0] in boosting.cpp.o
LightGBM::Tree::Shrinkage(double) [clone ._omp_fn.0] in boosting.cpp.o
LightGBM::GOSS::Bagging(int) [clone ._omp_fn.1] in boosting.cpp.o
LightGBM::RF::Boosting() [clone ._omp_fn.0] in boosting.cpp.o
...
"_omp_get_thread_num", referenced from:
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) [clone ._omp_fn.0] in application.cpp.o
std::_Function_handler<void (std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*), LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double)::{lambda(std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*)#2}>::_M_invoke(std::_Any_data const&, std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*&&) in application.cpp.o
LightGBM::Predictor::Predict(char const*, char const*, bool)::{lambda(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&)#2}::operator()(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&) const [clone ._omp_fn.0] in application.cpp.o
LightGBM::Application::Predict() [clone ._omp_fn.0] in application.cpp.o
std::_Function_handler<void (std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*), LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double)::{lambda(std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*)#4}>::_M_invoke(std::_Any_data const&, std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*&&) in application.cpp.o
std::_Function_handler<void (std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*), LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double)::{lambda(std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*)#3}>::_M_invoke(std::_Any_data const&, std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*&&) in application.cpp.o
std::_Function_handler<void (std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*), LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double)::{lambda(std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*)#1}>::_M_invoke(std::_Any_data const&, std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*&&) in application.cpp.o
...
"_omp_set_nested", referenced from:
LightGBM::Application::Application(int, char**) in application.cpp.o
"_omp_set_num_threads", referenced from:
LightGBM::Application::Application(int, char**) in application.cpp.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make[2]: *** [../lightgbm] Error 1
make[1]: *** [CMakeFiles/lightgbm.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[100%] Linking CXX shared library ../lib_lightgbm.so
Undefined symbols for architecture x86_64:
"_GOMP_atomic_end", referenced from:
LightGBM::RegressionL2loss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::Init(LightGBM::Metadata const&, int) [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropy::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropyLambda::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::LeafSplits::Init(float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
LightGBM::LeafSplits::Init(int, LightGBM::DataPartition const*, float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
...
"_GOMP_atomic_start", referenced from:
LightGBM::RegressionL2loss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::BinaryLogloss::Init(LightGBM::Metadata const&, int) [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropy::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::CrossEntropyLambda::BoostFromScore(int) const [clone ._omp_fn.0] in objective_function.cpp.o
LightGBM::LeafSplits::Init(float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
LightGBM::LeafSplits::Init(int, LightGBM::DataPartition const*, float const*, float const*) [clone ._omp_fn.0] in serial_tree_learner.cpp.o
...
"_GOMP_loop_end_nowait", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_loop_nonmonotonic_guided_next", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_loop_nonmonotonic_guided_start", referenced from:
LightGBM::Dataset::FinishLoad() [clone ._omp_fn.0] in dataset.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::CostructFromSampleData(double**, int**, int, int const*, unsigned long, int) [clone ._omp_fn.1] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.0] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.2] in dataset_loader.cpp.o
LightGBM::DatasetLoader::ConstructBinMappersFromTextData(int, int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&, LightGBM::Parser const*, LightGBM::Dataset*) [clone ._omp_fn.1] in dataset_loader.cpp.o
...
"_GOMP_parallel", referenced from:
_LGBM_DatasetPushRows in c_api.cpp.o
_LGBM_DatasetPushRowsByCSR in c_api.cpp.o
std::_Function_handler<void (int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&), LightGBM::Predictor::Predict(char const*, char const*, bool)::{lambda(int, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&)#2}>::_M_invoke(std::_Any_data const&, int&&, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > const&) in c_api.cpp.o
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) in c_api.cpp.o
LightGBM::Booster::Predict(int, int, int, std::function<std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > (int)>, LightGBM::Config const&, double*, long long*) in c_api.cpp.o
_LGBM_DatasetCreateFromCSR in c_api.cpp.o
_LGBM_DatasetCreateFromCSRFunc in c_api.cpp.o
...
"_omp_get_num_threads", referenced from:
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) [clone ._omp_fn.0] in c_api.cpp.o
_LGBM_BoosterPredictForCSC._omp_fn.0 in c_api.cpp.o
LightGBM::Booster::Predict(int, int, int, std::function<std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > (int)>, LightGBM::Config const&, double*, long long*) [clone ._omp_fn.0] in c_api.cpp.o
_LGBM_DatasetPushRows._omp_fn.0 in c_api.cpp.o
_LGBM_DatasetCreateFromMats._omp_fn.0 in c_api.cpp.o
_LGBM_DatasetPushRowsByCSR._omp_fn.0 in c_api.cpp.o
_LGBM_DatasetCreateFromCSR._omp_fn.0 in c_api.cpp.o
...
"_omp_get_thread_num", referenced from:
LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double) [clone ._omp_fn.0] in c_api.cpp.o
_LGBM_BoosterPredictForCSC._omp_fn.0 in c_api.cpp.o
std::_Function_handler<void (std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*), LightGBM::Predictor::Predictor(LightGBM::Boosting*, int, bool, bool, bool, bool, int, double)::{lambda(std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*)#2}>::_M_invoke(std::_Any_data const&, std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > const&, double*&&) in c_api.cpp.o
LightGBM::Booster::Predict(int, int, int, std::function<std::vector<std::pair<int, double>, std::allocator<std::pair<int, double> > > (int)>, LightGBM::Config const&, double*, long long*) [clone ._omp_fn.0] in c_api.cpp.o
_LGBM_DatasetPushRows._omp_fn.0 in c_api.cpp.o
_LGBM_DatasetCreateFromMats._omp_fn.0 in c_api.cpp.o
_LGBM_DatasetPushRowsByCSR._omp_fn.0 in c_api.cpp.o
...
"_omp_set_nested", referenced from:
LightGBM::Application::Application(int, char**) in application.cpp.o
"_omp_set_num_threads", referenced from:
_LGBM_DatasetCreateFromFile in c_api.cpp.o
_LGBM_DatasetCreateFromSampledColumn in c_api.cpp.o
_LGBM_BoosterPredictForCSR in c_api.cpp.o
_LGBM_BoosterPredictForMat in c_api.cpp.o
_LGBM_BoosterPredictForMats in c_api.cpp.o
_LGBM_BoosterPredictForCSRSingleRow in c_api.cpp.o
_LGBM_BoosterPredictForMatSingleRow in c_api.cpp.o
...
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make[2]: *** [../lib_lightgbm.so] Error 1
make[1]: *** [CMakeFiles/_lightgbm.dir/all] Error 2
make: *** [all] Error 2

`

Does anyone know how to solve this error?

[StrikerRUS]

@fangaohz Please provide your system info and steps which led to this error.

[brandenkmurray]

I was getting the same error.

I changed
export CXX=/usr/local/bin/g++-8 CC=/usr/local/bin/gcc-8
to
export CXX=g++-8 CC=gcc-8

and it worked.

[jameslamb]

Thanks @brandenkmurray

Yeah this depends on the way you installed g++. That location in our docs (/usr/local/bin/g++-8) is where homebrew will put it if you brew install g++. If you get it from some other source and that source is the one found by which g++, then your change will work!

We still need @fangaohz 's environment information though. From the log, I'm unsure whether clang or g++ is being used.

[brandenkmurray]

That's the weird thing. I installed via homebrew and they point to the location in the docs, yet it doesn't work if I export the full paths.

bmurray:/Documents/LightGBM$ which gcc-8
/usr/local/bin/gcc-8
bmurray:/Documents/LightGBM$ which g++-8
/usr/local/bin/g++-8

[jameslamb]

That's so weird 🤔

either way, @fangaohz please let us know if you can share more about your environment + the steps you ran to get to this error and we'll be happy to take a look at this!

[jameslamb]

I was able to reproduce this error tonight AND @brandenkmurray 's suggested workaround works for me.

I was able to reproduce (with the R package specifically) by cloning the most recent master and then running

Rscript build_r.R

R sessionInfo()

R version 3.5.0 (2018-04-23)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS  10.14.5

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

LightGBM commit: 686b0cc (most recent on master)

compiler versions

I will look into this (sorry for such a long delay!). The only reason I can think of for this behavior (given that which g++ returns the /usr/local/bin/g++-8) is that somewhere we have code that switches based on the literal string value of CC or CXX. I did a cursory scan of CMakeLists.txt and didn't see anything, but I'll do a more thorough search soon and respond here with what I find.

[brandenkmurray]

@jameslamb This looks like it could be the offending line:

LightGBM/R-package/src/install.libs.R

Line 48 in c4cd65f

if (Sys.info()['sysname'] == 'Darwin' && !(grepl('^gcc', Sys.getenv('CC', '')) & grepl('^g\\+\\+', Sys.getenv('CXX', '')))) {

It's looking for gcc and g++ to be at the beginning of the string.

Changing to grepl('gcc-[6-8]$', Sys.getenv('CC', '')) and grepl('g\\+\\+-[6-8]$', Sys.getenv('CXX', '')) works (just using "[6-8]" as an example, change the "[6-8]" to whatever versions are allowable).

[jameslamb]

@brandenkmurray Oh great, thanks! That definitely seems like it could be the culprit. Let me try and if that works for me, I'll open a PR with the change.

[jameslamb]

Just opened #2339 , I hope it fixes it! Thanks for the help.

@fangaohz if you find time to come back to this issue and tell us your original report was not from running the R package, we will re-open the issue. Thanks for reporting!