Cannot compile mex with openmp

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f10w
f10w 2017-12-7
回答： f10w 2017-12-7
Hello,
When compiling some C++ code in Matlab 2016b using:
mex CXXFLAGS="\$CXXFLAGS -std=c++11 -fopenmp" CXXOPTIMFLAGS='\$CXXOPTIMFLAGS -Ofast -DNDEBUG mexMyFunction.cpp
I got the following errors:
undefined reference to `omp_get_thread_num'
undefined reference to `omp_get_num_threads'
System: Ubuntu 16.04, g++ version: 5.4.0.
If I remove '-fopenmp' from the above command then it worked fine. Compiling directly with g++ (without mex) also worked.
Could you please help me to resolve this?
Thank you so much in advance!

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回答（1 个）

f10w
f10w 2017-12-7
Figured it out. Should be:
mex CXXFLAGS="\$CXXFLAGS -std=c++11 -fopenmp" CXXOPTIMFLAGS='\$CXXOPTIMFLAGS -Ofast -DNDEBUG' LDOPTIMFLAGS="$LDOPTIMFLAGS -fopenmp -O2" -lgomp -I"/home/khue/Libs/Eigen" mexMyFunction.cpp

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