Catch2 compile error (no such file or directory)

Question

I've already used Catch2 for testing sucessfully, but this time a problem occurred. I am pushing Catch2 submodule to me project (this is not a -v2.x branch) and include "../Catch2/src/catch2/catch_all.hpp" to my test files. The problem is that in catch_all.hpp all of the included .hpp files (like <catch2/benchmark/catch_benchmark_all.hpp>, <catch2/catch_approx.hpp> and so on) are not found. I've checked paths but they seem to be fine. Any ideas what is wrong with it?
Here's an example of my code.

I am adding a Catch2 submodule with command

git submodule add https://github.com/catchorg/Catch2.git

CMakeFile.txt:

cmake_minimum_required(VERSION 3.20)
project(proj)

set(CMAKE_CXX_STANDARD 17)

set (sources
        ./main.cpp
        ./test_main.cpp
        ./test.cpp)

add_executable(mainApp ${sources})
target_compile_options(mainApp PRIVATE -Wall -pedantic -std=c++17)
target_link_libraries(mainApp)

set (tests
        ./test_main.cpp
        ./test.cpp)

add_subdirectory(Catch2)
add_executable(runTests ${tests})
target_compile_options(mainApp PRIVATE -g)
target_link_libraries(runTests PRIVATE Catch2::Catch2WithMain)

test_main.cpp:

#define CATCH_CONFIG_MAIN
#include"Catch2/src/catch2/catch_all.hpp"

test.cpp:

#include"Catch2/src/catch2/catch_all.hpp"

TEST_CASE("BasicTest_1", "FirstTest") {
    REQUIRE(1 == 1);
}

main.cpp is just a simple helloworld for now.

TEST_CASE doesn't work either, it says "C++ requires a type specifier for all declarations".

Answer 1

You are including test_main.cpp and test.cpp in mainApp.

Which means that files in mainApp try to #include"Catch2/src/catch2/catch_all.hpp" without linking to the Catch2 library and includes.

Remove the test files from the mainApp sources and try again.