Switch to STATIC library and improve CMake integration

.gitlab-ci.yml

@@ -3,4 +3,4 @@ archlinux:
   before_script:
     - pacman -Sy cmake --noconfirm --needed
   script:
-    - mkdir build && cd build && cmake ../ && make && ctest
+    - mkdir build && cd build && cmake -DCOMPILE_TESTS:BOOL=ON ../ && make && ctest

CMakeLists.txt

@@ -2,12 +2,12 @@ cmake_minimum_required(VERSION 3.10)
 project(chessarbiter)
 
 # Shared library
-add_library(chessarbiter SHARED src/Piece.cpp src/Board.cpp src/Fen.cpp src/ChessArbiter.cpp)
-include_directories(src/)
-
-# Includes
-set(CHESSARBITER_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src PARENT_SCOPE) # To be used by other projects with add_subdirectory()
+add_library(chessarbiter STATIC src/Piece.cpp src/Board.cpp src/Fen.cpp src/ChessArbiter.cpp)
+target_include_directories(chessarbiter PUBLIC src/)
 
 # Unit tests
-enable_testing()
-add_subdirectory(./tests)
+set(COMPILE_TESTS OFF CACHE BOOL "Should unit tests be compiled")
+if(COMPILE_TESTS)
+    enable_testing()
+    add_subdirectory(./tests)
+endif()