undefined reference to `pthread_create' collect2: ld returned 1 exit status

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Linux下编译多线程程序遇到错误：

undefined reference to `pthread_create‘
collect2: ld returned 1 exit status

原因是系统无法找到pthread_create函数。也就是说编译器在link得时候找不到其中的一个使用库的函数。

解决办法如下：

For Linux the correct command is:

gcc -pthread xxx.c

In general, libraries should follow sources and objects on command line, and -lpthread is not an "option", it‘s a library specification. On a system with only libpthread.a installed,

gcc -lpthread xxx.c//By this, ld will try to link libpthread.so

will fail to link.

undefined reference to `pthread_create' collect2: ld returned 1 exit status

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原文地址：http://www.cnblogs.com/bukekangli/p/4553490.html