How to create a CMakeLists.txt for GoogleTest?

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I'm new to cmake and I'm trying to create a CMakeLists.txt for compiling my test files. I have 3 files: calc.cpp, calc.hpp, and calc_test.cpp and I use the following command to compile my tests:

g++ -o calc_test calc_test.cpp calc.cpp -lgtest -lpthread

which generates a binary file (calc_test) that I execute to run my tests.

Here's my calc.hpp:

#ifndef CALC_HPP_
#define CALC_HPP_

int add(int op1, int op2);
int sub(int op1, int op2);

#endif

My calc.cpp:

#include "calc.hpp"

int add(int op1, int op2) {
    return op1 + op2;
}

int sub(int op1, int op2) {
    return op1 - op2;
}

And my calc_test.cpp:

#include <gtest/gtest.h>
#include "calc.hpp"

TEST(CalcTest, Add) {
    ASSERT_EQ(2, add(1, 1));
    ASSERT_EQ(5, add(3, 2));
    ASSERT_EQ(10, add(7, 3));
}

TEST(CalcTest, Sub) {
    ASSERT_EQ(3, sub(5, 2));
    ASSERT_EQ(-10, sub(5, 15));
}

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

Now I have created a CMakeLists.txt file to compile my test files and it generates Makefile successfully, but when I execute cmake --build . it throws undefined reference error. Here's the content of my CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)

project(Google_Test)

add_library(TestModlue calc.cpp)
target_link_libraries(TestModlue -lgtest -lpthread)

add_executable(calc_test calc_test.cpp)

What am I doing wrong?

googletest cmake c++
1 Answers

You can use this as an example how to setup a project structure. It basically follows what I wrote above in my comment. CMake Google Test Example

* Your main code is put inside a library instead of directly including it in the application
* Create a seperate main binary (your application)
* Create another binary which contains your google tests
* Link both projects (application/gtests) against your library
user_22820110
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