ld:找不到用于-lomp的库

问题描述

在macOS Sierra中，启用openmp的xgboost的安装总是失败.

In macOS Sierra, installation for xgboost with openmp enabled always fails.

来自https://xgboost.readthedocs.io/en/latest/build.html，

我尝试过:

使用

export CC=/usr/local/Cellar/llvm/4.0.0_1/bin/clang
export CXX=/usr/local/Cellar/llvm/4.0.0_1/bin/clang++
export CXX1X=/usr/local/Cellar/llvm/4.0.0_1/bin/clang++

失败，

clang-4.0clang-4.0: : warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]warning:
argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
ld: library not found for -lomp
ld: library not found for -lomp
clang-4.0: error: linker command failed with exit code 1 (use -v to see invocation)

llvm支持openmp，但它失败，并显示ld: library not found for -lomp

llvm support openmp, but it fails with ld: library not found for -lomp

相关问题在Mac上安装xgboost-ld:未找到库

但是，clang-omp到了骨灰级，并且不再使用llvm的OpenMP支持.

But, clang-omp goes to boneyard, and discontinue with llvm's OpenMP support.

我已经深入到(使用-v选项)

I've drilled down to, (with -v option)

/usr/local/Cellar/llvm/4.0.0_1/bin/clang++ -std=c++11 -Wall -Wno-unknown-pragmas -Iinclude   -Idmlc-core/include -Irabit/include -I/include -O3 -funroll-loops -msse2 -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/common/hist_util.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_fast_hist.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

推荐答案

已解决

cd /usr/local/lib
ln -s /usr/local/Cellar/llvm/4.0.0_1/lib/libomp.dylib libomp.dylib

llvm安装缺少其符号链接.

llvm installation miss its symbolic link.

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