链接gtest项目时出错

最近我开始学习单元测试，我想用gtest测试我的程序 . 我用这个订单安装所有：

$ git clone https://github.com/google/googletest 
$ cd googletest 
$ cmake -DBUILD_SHARED_LIBS=ON . 
$ make 
$ cd googlemock 
$ sudo cp ./libgmock_main.so ./gtest/libgtest.so gtest/libgtest_main.so ./libgmock.so /usr/lib/ 
$ sudo ldconfig

现在写代码：

#include "gtest/gtest.h"

class Add
{
  private:
     int element;
  public:
     Add():element(0){}
     ~Add(){}
     void setElement(int e){ element = e; }
     int getElement() { return element; }
     int adder(int e) { return element += e; }
};

class AddTest : public ::testing::Test
{
  protected:
       int abc(int a){
            return a;
        }

     virtual void SetUp(){
          add1.setElement(1);
          add2.setElement(20);
     }
     virtual void TearDown(){}

Add add1;
Add add2;
};

TEST_F(AddTest, getTest)
{
   EXPECT_EQ(1, add1.getElement());
   EXPECT_EQ(20, add2.getElement());
}

int main(int argc, char **argv)
{
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
}

当我运行测试时结束我得到这个错误：

CMakeFiles / mock2.dir / main.cpp.o：在函数 AddTest_getTest_Test::TestBody()': /home/artem/CLionProjects/mock2/main.cpp:33: undefined reference to testing :: Message :: Message（）'/ home / artem / CLactProjects / mock2 / main.cpp：33：对 testing::internal::AssertHelper::AssertHelper(testing::TestPartResult::Type, char const*, int, char const*)' /home/artem/CLionProjects/mock2/main.cpp:33: undefined reference to testing :: internal ::的未定义引用AssertHelper :: operator =（testing :: Message const＆）const'/home/artem/CLionProjects/mock2/main.cpp:33：对 testing::internal::AssertHelper::~AssertHelper()' /home/artem/CLionProjects/mock2/main.cpp:34: undefined reference to 测试的未定义引用:: Message :: Message（）'/ home / artem / CLionProjects / mock2 / main.cpp：34：未定义引用 testing::internal::AssertHelper::AssertHelper(testing::TestPartResult::Type, char const*, int, char const*)' /home/artem/CLionProjects/mock2/main.cpp:34: undefined reference to testing :: internal :: AssertHelper :: operator =（testing :: Message const＆）const'/ home / artem / CLactProjects / mock2 / main.cpp：34：undefined reference to testing::internal::AssertHelper::~AssertHelper()' /home/artem/CLionProjects/mock2/main.cpp:33: undefined reference to testing :: internal :: AssertHelper :: ~AssertHelper（）'/ home / artem / CLIProjects / mock2 / main.cpp：34：对 testing::internal::AssertHelper::~AssertHelper()' CMakeFiles/mock2.dir/main.cpp.o: In function main'的未定义引用：/ home /artem/CLionProjects / mock2 / main.cpp： 39：对 testing::InitGoogleTest(int*, char**)' CMakeFiles/mock2.dir/main.cpp.o: In function __static_initialization_and_destruction_0（int，int）'的未定义引用：/ home / artem / CLIProjects / mock2 / main.cpp：31：未定义引用 testing::internal::MakeAndRegisterTestInfo(char const*, char const*, char const*, char const*, testing::internal::CodeLocation, void const*, void (*)(), void (*)(), testing::internal::TestFactoryBase*)' CMakeFiles/mock2.dir/main.cpp.o: In function RUN_ALL_TESTS（）'：/ usr / local / include / gtest / gtest.h ：2235：undefined refer从 testing::UnitTest::GetInstance()' /usr/local/include/gtest/gtest.h:2235: undefined reference to testing :: UnitTest :: Run（）'CMakeFiles / mock2.dir / main.cpp.o：在函数 AddTest::AddTest()': /home/artem/CLionProjects/mock2/main.cpp:15: undefined reference to testing :: Test :: Test（）'CMakeFiles / mock2.dir / main.cpp.o：在函数 AddTest::~AddTest()': /home/artem/CLionProjects/mock2/main.cpp:15: undefined reference to testing :: Test :: ~Test（）'CMakeFiles / mock2.dir / main.cpp.o：在函数 testing::internal::scoped_ptr<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::reset(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)': /usr/local/include/gtest/internal/gtest-port.h:1172: undefined reference to testing :: internal :: IsTrue（bool）'CMakeFiles / mock2.dir / main.cpp . o：在函数 testing::internal::scoped_ptr<std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> > >::reset(std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*)': /usr/local/include/gtest/internal/gtest-port.h:1172: undefined reference to testing :: internal :: IsTrue（bool）'CMakeFiles / mock2.dir / main.cpp.o：在函数 testing::AssertionResult testing::internal::CmpHelperEQ<int, int>(char const*, char const*, int const&, int const&)': /usr/local/include/gtest/gtest.h:1394: undefined reference to testing :: AssertionSuccess（）'CMakeFiles / mock2.dir / main.cpp.o：在函数 testing::AssertionResult testing::internal::CmpHelperEQFailure<int, int>(char const*, char const*, int const&, int const&)': /usr/local/include/gtest/gtest.h:1384: undefined reference to testing :: internal :: EqFailure（char const ，char const ，std :: __ cxx11 :: basic_string，std :: allocator> const＆，std :: __ cxx11 :: basic_string，std :: allocator> const＆，bool ）' CMakeFiles/mock2.dir/main.cpp.o:(.rodata._ZTI7AddTest[_ZTI7AddTest]+0x10): undefined reference to `typeinfo for testing::Test' collect2：错误：ld返回1退出状态CMakeFiles / mock2.dir / build.make：94：目标'mock2'失败make [3]： *** [mock2] Error 1 CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/mock2.dir/all' failed make[2]: [CMakeFiles / mock2.dir / all]错误2 CMakeFiles / Makefile2：79 ：目标'CMakeFiles/mock2.dir/rule'失败make [1]： **** **[CMakeFiles/mock2.dir/rule] Error 2 Makefile:118: recipe for target 'mock2' failed make: *** [mock2]错误2

但是当使用命令时

g++ main.cpp -o test -lgtest -lpthread

everytheng很好 . 如何修复它并在命令行中运行它？