/usr/bin/ld: /tmp/ccMz0hFd.o: undefined reference to symbol ‘pthread

在linux下，编写C++程序用到了线程库。
由于pthread库不是Linux系统默认的库，连接时需要使用库libpthread.a,所以在编译中要加-lpthread参数:

g++ xxxx.cpp -lpthread -o pthread

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/usr/bin/ld: /tmp/ccMz0hFd.o: undefined reference to symbol ‘pthread_condatt

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