linux 下安装opencv3.0在编译时出现的问题undefined reference to `parallel_pthreads_set_threads_num(int)'

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来自：http://blog.csdn.net/lyk_ffl/article/details/47683549

错误如下：

Linking CXX executable ../../bin/opencv_perf_core

在编译opencv 3.0 gold时，编译到大约37%时，出现

../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_pthreads_set_threads_num(int)'
../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_pthreads_get_threads_num()'
../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_for_pthreads(cv::Range const&, cv::ParallelLoopBody const&, double)'等好几个错误，困扰了好久，经多次尝试和不懈的坚持下，终于在github上找到了解决方法，现分享如下：

修改modules/core/src/parallel.cpp，添加7处删除5处（+表示要添加，-表示要删除）

132    namespace cv
133    {
134        ParallelLoopBody::~ParallelLoopBody() {}
135    +#if defined HAVE_PTHREADS && HAVE_PTHREADS
136    +    void parallel_for_pthreads(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes);
137    +    size_t parallel_pthreads_get_threads_num();
138    +    void parallel_pthreads_set_threads_num(int num);
139    +#endif
140     }
141     
142    +
143    namespace
144    {
145    #ifdef CV_PARALLEL_FRAMEWORK
    .
    .
    .

307         }
308 
309    #elif defined HAVE_PTHREADS
    -        void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes);
310    +
311             parallel_for_pthreads(range, body, nstripes);
312 
313     #else
    .
    .
    .

367 
368    #elif defined HAVE_PTHREADS
369 
    -        size_t parallel_pthreads_get_threads_num();
    -
370         return parallel_pthreads_get_threads_num();
371 
372    #else
.
.
.
428 
429    #elif defined HAVE_PTHREADS
430 
    -    void parallel_pthreads_set_threads_num(int num);    
    -
431     parallel_pthreads_set_threads_num(threads);
432 

433    #endif

要是看的不方便的话，原始链接如下：

https://github.com/mshabunin/opencv/commit/1f983ec39c97298b0c8ce409a1cc229ecf14e55c?diff=unified

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