How To Configure CMakeLists.txt To Make C++ Project?

Question

I am currently trying to teach myself cmake, and I am getting errors when I run make, but the program runs just fine when I compile the files myself. In my project, I have 2 header files declaring classes Card and DeckOfCards, 2 .cpp files defining my classes, and a .cpp driver program, main.cpp. I have tried looking online how to properly use cmake, but I can't find a whole lot. Here is what i have in my CMakeLists.txt... ``` cmake_minimum_required(VERSION 2.8.7) project(Assignment_8) add_library(card Card.h Card.cpp) add_library(deckofcards DeckOfCards.h DeckOfCards.cpp) add_executable(card_class_driver main.cpp) target_link_libraries(card_class_driver card) target_link_libraries(card_class_driver deckofcards) ``` And on the 'target_link_libraries', i have also tried just one 'declaration' if you will, and get the same errors, like this.. ``` target_link_libraries(card_class_driver card deckofcards) ``` I have the source files in a directory called 'assignment_8', and a subdirectory…

Accepted Answer

It seems you have an unmentioned dependency between your libraries.

Your `deckofcards` library uses stuff from the `card` library. You need to tell this to CMake, otherwise it won't be able to link your program correctly. The correct way to do this is by changing the last two lines of your CMakeLists to

```
target_link_libraries(deckofcards card)
target_link_libraries(card_class_driver deckofcards)
```

Notice that you don't need to specify the `card` library again on the last line. CMake automatically resolves transitive dependencies in this case: Since `deckofcards` depends on `card`, everything that uses the former will also be linked against the latter.

How To Configure CMakeLists.txt To Make C++ Project?

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