Cmake not building lib correctly [duplicate] - c++

Question

This question already has answers here:
Why can templates only be implemented in the header file?
(17 answers)
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 5 days ago.
I've been trying to make a c++ static library using cmake on linux, but I keep getting undefined reference errors
cmake_minimum_required(VERSION 3.0.0)
project(eecsge VERSION 0.1.0)
include(CTest)
enable_testing()
include_directories(.)
set(SRCS
EECSGE/core/src/ComponentManager.cpp
EECSGE/core/src/Coordinator.cpp
EECSGE/core/src/EntityManager.cpp
EECSGE/core/src/SystemManager.cpp
)
set(SYSTEMS
EECSGE/systems/src/animation.cpp
EECSGE/systems/src/background.cpp
EECSGE/systems/src/collision.cpp
EECSGE/systems/src/death.cpp
EECSGE/systems/src/drawable.cpp
EECSGE/systems/src/movement.cpp
EECSGE/systems/src/player.cpp
EECSGE/systems/src/sound.cpp
)
include(FetchContent)
FetchContent_Declare(SFML
GIT_REPOSITORY https://github.com/SFML/SFML.git
GIT_TAG 2.5.x)
FetchContent_MakeAvailable(SFML)
FetchContent_Declare(GTEST
GIT_REPOSITORY https://github.com/google/googletest
GIT_TAG v1.13.x)
FetchContent_MakeAvailable(GTEST)
add_library(eecsge STATIC ${SRCS} ${SYSTEMS})
target_link_libraries(eecsge sfml-audio sfml-graphics sfml-system sfml-window gtest gtest_main)
target_include_directories(eecsge PUBLIC
$<BUILD_INTERFACE:${${CMAKE_CURRENT_SOURCE_DIR}}>
PRIVATE ${${CMAKE_CURRENT_SOURCE_DIR}}/EECSGE/core/include
${${CMAKE_CURRENT_SOURCE_DIR}}/EECSGE/systems/include
${${CMAKE_CURRENT_SOURCE_DIR}}/EECSGE/components
)
Here is the directory organization
EECSGE
├── components
│ ├── collision.hpp
│ ├── Components.hpp
│ ├── drawable.hpp
│ ├── health.hpp
│ ├── input.hpp
│ ├── movement.hpp
│ ├── sound.hpp
│ └── transform.hpp
├── core
│ ├── Core.hpp
│ ├── include
│ │ ├── ComponentManager.hpp
│ │ ├── Coordinator.hpp
│ │ ├── EntityManager.hpp
│ │ ├── IComponentArray.hpp
│ │ ├── System.hpp
│ │ ├── SystemManager.hpp
│ │ └── Types.hpp
│ └── src
│ ├── ComponentManager.cpp
│ ├── Coordinator.cpp
│ ├── EntityManager.cpp
│ └── SystemManager.cpp
├── EECSGE.hpp
└── systems
├── include
│ ├── animation.hpp
│ ├── background.hpp
│ ├── collision.hpp
│ ├── death.hpp
│ ├── drawable.hpp
│ ├── movement.hpp
│ ├── player.hpp
│ └── sound.hpp
├── src
│ ├── animation.cpp
│ ├── background.cpp
│ ├── collision.cpp
│ ├── death.cpp
│ ├── drawable.cpp
│ ├── movement.cpp
│ ├── player.cpp
│ └── sound.cpp
└── Systems.hpp
Yes it's not pretty, I plan on refactoring when i'm done, but I want to be able to test what I have already.
Here is some of the errors I get when trying to use this library with another program
/usr/bin/ld: CMakeFiles/Demo.dir/demo/demo.cpp.o: in function `init_player()':
demo.cpp:(.text+0x377): undefined reference to `void Coordinator::AddComponent<Transform>(unsigned int, Transform)'
/usr/bin/ld: demo.cpp:(.text+0x3e8): undefined reference to `void Coordinator::AddComponent<Movement>(unsigned int, Movement)'
/usr/bin/ld: demo.cpp:(.text+0x471): undefined reference to `void Coordinator::AddComponent<Drawable>(unsigned int, Drawable)'
/usr/bin/ld: demo.cpp:(.text+0x4f6): undefined reference to `void Coordinator::AddComponent<InputKeys>(unsigned int, InputKeys)'
/usr/bin/ld: demo.cpp:(.text+0x516): undefined reference to `void Coordinator::AddComponent<Collision>(unsigned int, Collision)'
/usr/bin/ld: demo.cpp:(.text+0x537): undefined reference to `void Coordinator::AddComponent<Health>(unsigned int, Health)'
/usr/bin/ld: CMakeFiles/Demo.dir/demo/demo.cpp.o: in function `init_enemy()':
demo.cpp:(.text+0x91e): undefined reference to `void Coordinator::AddComponent<Transform>(unsigned int, Transform)'
/usr/bin/ld: demo.cpp:(.text+0x98f): undefined reference to `void Coordinator::AddComponent<Movement>(unsigned int, Movement)'
/usr/bin/ld: demo.cpp:(.text+0xa1b): undefined reference to `void Coordinator::AddComponent<Drawable>(unsigned int, Drawable)'
/usr/bin/ld: demo.cpp:(.text+0xa46): undefined reference to `void Coordinator::AddComponent<Collision>(unsigned int, Collision)'
/usr/bin/ld: demo.cpp:(.text+0xa67): undefined reference to `void Coordinator::AddComponent<Health>(unsigned int, Health)'
/usr/bin/ld: CMakeFiles/Demo.dir/demo/demo.cpp.o: in function `init_background(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, sf::Vector2<float>, sf::Vector2<float>)':
demo.cpp:(.text+0xee3): undefined reference to `void Coordinator::AddComponent<Transform>(unsigned int, Transform)'
/usr/bin/ld: demo.cpp:(.text+0xf45): undefined reference to `void Coordinator::AddComponent<Movement>(unsigned int, Movement)'
/usr/bin/ld: demo.cpp:(.text+0xfd1): undefined reference to `void Coordinator::AddComponent<Drawable>(unsigned int, Drawable)'
/usr/bin/ld: CMakeFiles/Demo.dir/demo/demo.cpp.o: in function `main':
demo.cpp:(.text+0x1743): undefined reference to `void Coordinator::RegisterComponent<Movement>()'
/usr/bin/ld: demo.cpp:(.text+0x1752): undefined reference to `void Coordinator::RegisterComponent<Transform>()'
/usr/bin/ld: demo.cpp:(.text+0x1761): undefined reference to `void Coordinator::RegisterComponent<InputKeys>()'
/usr/bin/ld: demo.cpp:(.text+0x1770): undefined reference to `void Coordinator::RegisterComponent<Drawable>()'
/usr/bin/ld: demo.cpp:(.text+0x177f): undefined reference to `void Coordinator::RegisterComponent<Collision>()'
/usr/bin/ld: demo.cpp:(.text+0x178e): undefined reference to `void Coordinator::RegisterComponent<Health>()'
/usr/bin/ld: demo.cpp:(.text+0x17a7): undefined reference to `std::shared_ptr<PlayerSystem> Coordinator::RegisterSystem<PlayerSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x17c0): undefined reference to `std::shared_ptr<DrawSystem> Coordinator::RegisterSystem<DrawSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x17d9): undefined reference to `std::shared_ptr<CollisionSystem> Coordinator::RegisterSystem<CollisionSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x17f2): undefined reference to `std::shared_ptr<MovementSystem> Coordinator::RegisterSystem<MovementSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x180b): undefined reference to `std::shared_ptr<DeathSystem> Coordinator::RegisterSystem<DeathSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x1824): undefined reference to `std::shared_ptr<AnimationSystem> Coordinator::RegisterSystem<AnimationSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x183d): undefined reference to `std::shared_ptr<BackgroundSystem> Coordinator::RegisterSystem<BackgroundSystem>()'
/usr/bin/ld: demo.cpp:(.text+0x1857): undefined reference to `unsigned char Coordinator::GetComponentType<Movement>()'
/usr/bin/ld: demo.cpp:(.text+0x1880): undefined reference to `unsigned char Coordinator::GetComponentType<Transform>()'
/usr/bin/ld: demo.cpp:(.text+0x18b3): undefined reference to `void Coordinator::SetSystemSignature<MovementSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x18cd): undefined reference to `unsigned char Coordinator::GetComponentType<Transform>()'
/usr/bin/ld: demo.cpp:(.text+0x18f6): undefined reference to `unsigned char Coordinator::GetComponentType<Drawable>()'
/usr/bin/ld: demo.cpp:(.text+0x1929): undefined reference to `void Coordinator::SetSystemSignature<DrawSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x1943): undefined reference to `unsigned char Coordinator::GetComponentType<InputKeys>()'
/usr/bin/ld: demo.cpp:(.text+0x1976): undefined reference to `void Coordinator::SetSystemSignature<PlayerSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x198f): undefined reference to `void Coordinator::SetSystemSignature<AnimationSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x19a9): undefined reference to `unsigned char Coordinator::GetComponentType<Drawable>()'
/usr/bin/ld: demo.cpp:(.text+0x19d2): undefined reference to `unsigned char Coordinator::GetComponentType<Collision>()'
/usr/bin/ld: demo.cpp:(.text+0x19fb): undefined reference to `unsigned char Coordinator::GetComponentType<Health>()'
/usr/bin/ld: demo.cpp:(.text+0x1a2e): undefined reference to `void Coordinator::SetSystemSignature<CollisionSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x1a48): undefined reference to `unsigned char Coordinator::GetComponentType<Health>()'
/usr/bin/ld: demo.cpp:(.text+0x1a7b): undefined reference to `void Coordinator::SetSystemSignature<DeathSystem>(std::bitset<32ul>)'
/usr/bin/ld: demo.cpp:(.text+0x1a95): undefined reference to `unsigned char Coordinator::GetComponentType<Drawable>()'
/usr/bin/ld: demo.cpp:(.text+0x1abe): undefined reference to `unsigned char Coordinator::GetComponentType<Transform>()'
/usr/bin/ld: demo.cpp:(.text+0x1af1): undefined reference to `void Coordinator::SetSystemSignature<BackgroundSystem>(std::bitset<32ul>)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(animation.cpp.o): in function `AnimationSystem::Update()':
animation.cpp:(.text+0x6f): undefined reference to `Transform& Coordinator::GetComponent<Transform>(unsigned int)'
/usr/bin/ld: animation.cpp:(.text+0x8a): undefined reference to `Movement& Coordinator::GetComponent<Movement>(unsigned int)'
/usr/bin/ld: animation.cpp:(.text+0xa5): undefined reference to `Drawable& Coordinator::GetComponent<Drawable>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(background.cpp.o): in function `BackgroundSystem::Update()':
background.cpp:(.text+0x6f): undefined reference to `Transform& Coordinator::GetComponent<Transform>(unsigned int)'
/usr/bin/ld: background.cpp:(.text+0x8a): undefined reference to `Drawable& Coordinator::GetComponent<Drawable>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(collision.cpp.o): in function `CollisionSystem::Update(float)':
collision.cpp:(.text+0x108): undefined reference to `Collision& Coordinator::GetComponent<Collision>(unsigned int)'
/usr/bin/ld: collision.cpp:(.text+0x12a): undefined reference to `Collision& Coordinator::GetComponent<Collision>(unsigned int)'
/usr/bin/ld: collision.cpp:(.text+0x160): undefined reference to `Drawable& Coordinator::GetComponent<Drawable>(unsigned int)'
/usr/bin/ld: collision.cpp:(.text+0x18f): undefined reference to `Drawable& Coordinator::GetComponent<Drawable>(unsigned int)'
/usr/bin/ld: collision.cpp:(.text+0x235): undefined reference to `Health& Coordinator::GetComponent<Health>(unsigned int)'
/usr/bin/ld: collision.cpp:(.text+0x25b): undefined reference to `Health& Coordinator::GetComponent<Health>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(death.cpp.o): in function `DeathSystem::Update()':
death.cpp:(.text+0x6c): undefined reference to `Health& Coordinator::GetComponent<Health>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(drawable.cpp.o): in function `DrawSystem::DrawEntities(sf::RenderWindow*)':
drawable.cpp:(.text+0x74): undefined reference to `Transform& Coordinator::GetComponent<Transform>(unsigned int)'
/usr/bin/ld: drawable.cpp:(.text+0x8f): undefined reference to `Movement& Coordinator::GetComponent<Movement>(unsigned int)'
/usr/bin/ld: drawable.cpp:(.text+0xaa): undefined reference to `Drawable& Coordinator::GetComponent<Drawable>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(movement.cpp.o): in function `MovementSystem::Update()':
movement.cpp:(.text+0x6d): undefined reference to `Movement& Coordinator::GetComponent<Movement>(unsigned int)'
/usr/bin/ld: movement.cpp:(.text+0x85): undefined reference to `Transform& Coordinator::GetComponent<Transform>(unsigned int)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(player.cpp.o): in function `PlayerSystem::Shoot(Transform&, Movement&)':
player.cpp:(.text+0x1eb): undefined reference to `void Coordinator::AddComponent<Movement>(unsigned int, Movement)'
/usr/bin/ld: player.cpp:(.text+0x328): undefined reference to `void Coordinator::AddComponent<Drawable>(unsigned int, Drawable)'
/usr/bin/ld: player.cpp:(.text+0x46f): undefined reference to `void Coordinator::AddComponent<Transform>(unsigned int, Transform)'
/usr/bin/ld: player.cpp:(.text+0x48f): undefined reference to `void Coordinator::AddComponent<Collision>(unsigned int, Collision)'
/usr/bin/ld: player.cpp:(.text+0x4b0): undefined reference to `void Coordinator::AddComponent<Health>(unsigned int, Health)'
/usr/bin/ld: _deps/eecsge-build/libeecsge.a(player.cpp.o): in function `PlayerSystem::Update(sf::Event)':
player.cpp:(.text+0x5f6): undefined reference to `InputKeys& Coordinator::GetComponent<InputKeys>(unsigned int)'
/usr/bin/ld: player.cpp:(.text+0x611): undefined reference to `Movement& Coordinator::GetComponent<Movement>(unsigned int)'
/usr/bin/ld: player.cpp:(.text+0x62c): undefined reference to `Transform& Coordinator::GetComponent<Transform>(unsigned int)'
collect2: error: ld returned 1 exit status
Any help would be appreciated

Answer 1

Then I believe it's a duplicate of this: Why can templates only be implemented in the header file? –
drescherjm
19 mins ago
Because I had implemented the Core files in .cpp, it caused problems. Re-implementing them in the .hpp files worked.