在 Mac 上安装 xgboost - ld: 找不到库
Install xgboost on Mac - ld: library not found
我正在尝试在我的 mac 上安装支持 OpenMP 的 xgboost。我安装 gcc 没问题：
brew install gcc --without-multilib
然后克隆 git 存储库：
git clone --recursive https://github.com/dmlc/xgboost
cd xgboost; cp make/config.mk ./config.mk
但是当我这样做时出现错误
make -j4
这是我得到的错误。如果您能帮助解决这个问题，我将不胜感激：
c++ -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -o xgboost build/cli_main.o build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp
c++ -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -shared -o lib/libxgboost.so build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp
clangclang: : warningwarning: : argument unused during compilation: '-pthread'argument unused during compilation: '-pthread'
ld: library not found for -lgomp
ld: library not found for -lgomp
clang: error: clanglinker command failed with exit code 1 (use -v to see invocation):
error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [lib/libxgboost.so] Error 1
make: *** Waiting for unfinished jobs....
make: *** [xgboost] Error 1
OSX 的新版本将 Clang 作为默认的 c\c++ 编译器。因此，您的 c++ 命令指的是 clang++。
您应该像这样为您的 make 命令定义一个 CC\CXX 环境变量 CC=gcc CXX=g++ make -j
您还可以为 clang OpenMPrt 构建一个 OpenMP 并自定义您的 shell 环境（我没有自己尝试）
（我目前没有 mac 来检查这个解决方案；只有 linux）
我遇到了同样的问题并通过以下方式解决了：
brew install clang-omp
export CC=clang-omp
export CXX=clang-omp++
git clone --recursive https://github.com/dmlc/xgboost
cd xgboost; cp make/config.mk ./config.mk; make -j4
cd python-package
sudo python setup.py install
如果你之前使用pip安装过xgboost，那么请将之前安装的xgboost从你的项目中删除。然后使用
pip install xgboost
重新安装。
我正在尝试在我的 mac 上安装支持 OpenMP 的 xgboost。我安装 gcc 没问题：
brew install gcc --without-multilib
然后克隆 git 存储库：
git clone --recursive https://github.com/dmlc/xgboost
cd xgboost; cp make/config.mk ./config.mk
但是当我这样做时出现错误
make -j4
这是我得到的错误。如果您能帮助解决这个问题，我将不胜感激：
c++ -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -o xgboost build/cli_main.o build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp
c++ -std=c++0x -Wall -O3 -msse2 -Wno-unknown-pragmas -funroll-loops -Iinclude -Idmlc-core/include -Irabit/include -fPIC -fopenmp -shared -o lib/libxgboost.so build/learner.o build/logging.o build/c_api/c_api.o build/c_api/c_api_error.o build/common/common.o build/data/data.o build/data/simple_csr_source.o build/data/simple_dmatrix.o build/data/sparse_page_dmatrix.o build/data/sparse_page_raw_format.o build/data/sparse_page_source.o build/data/sparse_page_writer.o build/gbm/gblinear.o build/gbm/gbm.o build/gbm/gbtree.o build/metric/elementwise_metric.o build/metric/metric.o build/metric/multiclass_metric.o build/metric/rank_metric.o build/objective/multiclass_obj.o build/objective/objective.o build/objective/rank_obj.o build/objective/regression_obj.o build/tree/tree_model.o build/tree/tree_updater.o build/tree/updater_colmaker.o build/tree/updater_histmaker.o build/tree/updater_prune.o build/tree/updater_refresh.o build/tree/updater_skmaker.o build/tree/updater_sync.o dmlc-core/libdmlc.a rabit/lib/librabit.a -pthread -lm -fopenmp
clangclang: : warningwarning: : argument unused during compilation: '-pthread'argument unused during compilation: '-pthread'
ld: library not found for -lgomp
ld: library not found for -lgomp
clang: error: clanglinker command failed with exit code 1 (use -v to see invocation):
error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [lib/libxgboost.so] Error 1
make: *** Waiting for unfinished jobs....
make: *** [xgboost] Error 1
OSX 的新版本将 Clang 作为默认的 c\c++ 编译器。因此，您的 c++ 命令指的是 clang++。
您应该像这样为您的 make 命令定义一个 CC\CXX 环境变量 CC=gcc CXX=g++ make -j
您还可以为 clang OpenMPrt 构建一个 OpenMP 并自定义您的 shell 环境（我没有自己尝试）
（我目前没有 mac 来检查这个解决方案；只有 linux）
我遇到了同样的问题并通过以下方式解决了：
brew install clang-omp
export CC=clang-omp
export CXX=clang-omp++
git clone --recursive https://github.com/dmlc/xgboost
cd xgboost; cp make/config.mk ./config.mk; make -j4
cd python-package
sudo python setup.py install
如果你之前使用pip安装过xgboost，那么请将之前安装的xgboost从你的项目中删除。然后使用
pip install xgboost
重新安装。