未定义的引用`pthread_key_create'（链接器错误） [英] undefined reference to `pthread_key_create' (linker error)

问题描述

我已从这里下载gtest 1.7.0个来源：

I have downloaded gtest 1.7.0 sources from here:

https://code.google.com/p/googletest/downloads/list

并构建gtest .a文件（lib文件）在ubuntu 13.10：

and build the gtest .a files (lib files) on ubuntu 13.10:

Linux ubuntu 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

并调用生成的lib： libgtest.a 。在我的main.cpp文件中有：

and the resulting lib is called: libgtest.a. In my main.cpp file Have:

#include <iostream>
#include "gtest/gtest.h"

int main(){
    std::cout << "Test \n";
    int argc = 2;
    char* cp01;
    char* cp02;
    char* argv[] = {cp01, cp02};
    testing::InitGoogleTest(&argc, argv);
    return 0;
}

从我建立的终端：

g++ main.cpp -I/home/user/gtest-1.7.0/include -L/home/user/gtest-1.7.0/lib/.libs -lpthread -lgtest

这会产生以下错误：

/home/user/gtest-1.7.0/lib/.libs/libgtest.so: undefined reference to `pthread_key_create'
/home/user/gtest-1.7.0/lib/.libs/libgtest.so: undefined reference to `pthread_getspecific'
/home/user/gtest-1.7.0/lib/.libs/libgtest.so: undefined reference to `pthread_key_delete'
/home/user/gtest-1.7.0/lib/.libs/libgtest.so: undefined reference to `pthread_setspecific'
collect2: error: ld returned 1 exit status

基于此：
错误

我也尝试过 -pthread code> -lpthread 但给出相同的错误：

I have also tried -pthread instead of -lpthread but gives same error:

g++ main.cpp -I/home/user/gtest-1.7.0/include -L/home/user/gtest-1.7.0/lib/.libs -pthread -lgtest

编辑：我也尝试指定 -pthread 作为最后一个参数：

I have also tried to specifying -pthread as the last argument:

g++ main.cpp -I/home/user/gtest-1.7.0/include -L/home/user/gtest-1.7.0/lib/.libs -lgtest -pthread

相同的错误
我做错了什么？

same error What am I doing wrong?

推荐答案

选项 -lgtest 正在尝试链接动态库 libgtest。因此。您
希望链接静态库 /home/user/gtest-1.7.0/lib/.libs/libgtest.a 。

The option -lgtest is attempting to link the dynamic library libgtest.so. You wish to link the static library /home/user/gtest-1.7.0/lib/.libs/libgtest.a.

而不是：

g++ main.cpp -I/home/user/gtest-1.7.0/include -L/home/user/gtest-1.7.0/lib/.libs -lgtest -pthread

$ b b

use：

use:

g++ main.cpp -I/home/user/gtest-1.7.0/include /home/user/gtest-1.7.0/lib/.libs/libgtest.a -pthread

请注意您的命令行不会为生成的可执行文件提供名称，这会将
默认为 a.out 。如果你想要它调用，例如。 mytest ，然后执行：

Note that your commandline supplies no name for the resulting executable, which will default to a.out. If you want it called, e.g. mytest, then do:

g++ -o mytest main.cpp -I/home/user/gtest-1.7.0/include /home/user/gtest-1.7.0/lib/.libs/libgtest.a -pthread

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