Error when linking gtest project - c++

Question

recently I start study unit testing , and I want test my program with gtest. I install all with this order :
$ 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
and now write code :
#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();
}
end when I run test i get this error :
CMakeFiles/mock2.dir/main.cpp.o: In function AddTest_getTest_Test::TestBody()':
/home/artem/CLionProjects/mock2/main.cpp:33: undefined reference totesting::Message::Message()'
/home/artem/CLionProjects/mock2/main.cpp:33: undefined reference to testing::internal::AssertHelper::AssertHelper(testing::TestPartResult::Type, char const*, int, char const*)'
/home/artem/CLionProjects/mock2/main.cpp:33: undefined reference totesting::internal::AssertHelper::operator=(testing::Message const&) const'
/home/artem/CLionProjects/mock2/main.cpp:33: undefined reference to testing::internal::AssertHelper::~AssertHelper()'
/home/artem/CLionProjects/mock2/main.cpp:34: undefined reference totesting::Message::Message()'
/home/artem/CLionProjects/mock2/main.cpp:34: undefined reference to testing::internal::AssertHelper::AssertHelper(testing::TestPartResult::Type, char const*, int, char const*)'
/home/artem/CLionProjects/mock2/main.cpp:34: undefined reference totesting::internal::AssertHelper::operator=(testing::Message const&) const'
/home/artem/CLionProjects/mock2/main.cpp:34: undefined reference to testing::internal::AssertHelper::~AssertHelper()'
/home/artem/CLionProjects/mock2/main.cpp:33: undefined reference totesting::internal::AssertHelper::~AssertHelper()'
/home/artem/CLionProjects/mock2/main.cpp:34: undefined reference to testing::internal::AssertHelper::~AssertHelper()'
CMakeFiles/mock2.dir/main.cpp.o: In functionmain':
/home/artem/CLionProjects/mock2/main.cpp:39: undefined reference to testing::InitGoogleTest(int*, char**)'
CMakeFiles/mock2.dir/main.cpp.o: In function__static_initialization_and_destruction_0(int, int)':
/home/artem/CLionProjects/mock2/main.cpp:31: undefined reference to 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 functionRUN_ALL_TESTS()':
/usr/local/include/gtest/gtest.h:2235: undefined reference to testing::UnitTest::GetInstance()'
/usr/local/include/gtest/gtest.h:2235: undefined reference totesting::UnitTest::Run()'
CMakeFiles/mock2.dir/main.cpp.o: In function AddTest::AddTest()':
/home/artem/CLionProjects/mock2/main.cpp:15: undefined reference totesting::Test::Test()'
CMakeFiles/mock2.dir/main.cpp.o: In function AddTest::~AddTest()':
/home/artem/CLionProjects/mock2/main.cpp:15: undefined reference totesting::Test::~Test()'
CMakeFiles/mock2.dir/main.cpp.o: In function 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 totesting::internal::IsTrue(bool)'
CMakeFiles/mock2.dir/main.cpp.o: In function 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 totesting::internal::IsTrue(bool)'
CMakeFiles/mock2.dir/main.cpp.o: In function testing::AssertionResult testing::internal::CmpHelperEQ<int, int>(char const*, char const*, int const&, int const&)':
/usr/local/include/gtest/gtest.h:1394: undefined reference totesting::AssertionSuccess()'
CMakeFiles/mock2.dir/main.cpp.o: In function testing::AssertionResult testing::internal::CmpHelperEQFailure<int, int>(char const*, char const*, int const&, int const&)':
/usr/local/include/gtest/gtest.h:1384: undefined reference totesting::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: error: ld returned 1 exit status
CMakeFiles/mock2.dir/build.make:94: recipe for target 'mock2' failed
make[3]: * [mock2] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/mock2.dir/all' failed
make[2]: [CMakeFiles/mock2.dir/all] Error 2
CMakeFiles/Makefile2:79: recipe for target 'CMakeFiles/mock2.dir/rule' failed
make[1]: [CMakeFiles/mock2.dir/rule] Error 2
Makefile:118: recipe for target 'mock2' failed
make: * [mock2] Error 2
but when use command
g++ main.cpp -o test -lgtest -lpthread
everytheng is good. How can I fix it and run it not in command line ?

Answer 1

If you are using CLion then you may have a CMakeLists.txt file you should add rules to link to the libraries. To do this add the following line to your CMakeLists.txt
enable_testing()
find_package(GTest REQUIRED) # Find the google testing framework on your system
include_directories(${GTEST_INCLUDE_DIRS})
target_link_libraries(${PROJECT_NAME} ${GTEST_LIBRARIES}) # Replace ${PROJECT_NAME} with your target name
For more details go here.