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今天将log4cplus引入自己的程序，由于log4cplus需要线程库的支持，在静态编译的时候加上了-lpthread,但是始终在编译的时候提示找不到线程函数：

liblog4cplus.a(socketappender.o): In function `log4cplus::thread::PthreadMutexAttr::set_type(log4cplus::thread::Mutex::Type)':

../include/log4cplus/helpers/syncprims-pthreads.h:80: undefined reference to `pthread_mutexattr_settype'

liblog4cplus.a(socketappender.o): In function `~PthreadMutexAttr':

../include/log4cplus/helpers/syncprims-pthreads.h:58: undefined reference to `pthread_mutexattr_destroy'

liblog4cplus.a(socketappender.o): In function `ManualResetEvent':

../include/log4cplus/helpers/syncprims-pthreads.h:200: undefined reference to `pthread_cond_init'

liblog4cplus.a(socketappender.o): In function `~PthreadMutexAttr':

../include/log4cplus/helpers/syncprims-pthreads.h:58: undefined reference to `pthread_mutexattr_destroy'

liblog4cplus.a(socketappender.o): In function `~ManualResetEvent':

../include/log4cplus/helpers/syncprims-pthreads.h:210: undefined reference to `pthread_cond_destroy'

../include/log4cplus/helpers/syncprims-pthreads.h:210: undefined reference to `pthread_cond_destroy'

liblog4cplus.a(socketappender.o): In function `log4cplus::thread::ManualResetEvent::timed_wait(unsigned long) const':

../include/log4cplus/helpers/syncprims-pthreads.h:272: undefined reference to `pthread_cond_timedwait'

于是搜索发现必须在编译的时候加上"-pthread" 才能正常编译通过。

附上g++中-pthread和-lpthread的区别说明文章：

http://blog.chinaunix.net/uid-25909722-id-3026989.html

http://chaoslawful.iteye.com/blog/568602

http://kasicass.blog.163.com/blog/static/395619200992410313759/