make it compile with cmake.

CMakeLists.txt

@@ -1,8 +1,66 @@
-cmake_minimum_required(VERSION 3.0)
-cmake_policy(VERSION 3.0...3.18.4)
-project(proj)
-add_executable(app src/main.cpp)
-find_package(OpenCLHeaders REQUIRED)
-find_package(OpenCLICDLoader REQUIRED)
-find_package(OpenCLHeadersCpp REQUIRED)
-target_link_libraries(app PRIVATE OpenCL::Headers OpenCL::OpenCL OpenCL::HeadersCpp)
+cmake_minimum_required(VERSION 3.15...4.0)
+project(
+  simulator
+  VERSION 0.0.1
+  DESCRIPTION "Simulation of Ground Fertility, 1 tick every time it is ran."
+  LANGUAGES CXX)
+
+
+# Only do these if this is the main project, and not if it is included through add_subdirectory
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+
+  # Optionally set things like CMAKE_CXX_STANDARD, CMAKE_POSITION_INDEPENDENT_CODE here
+
+  # Let's ensure -std=c++xx instead of -std=g++xx
+  set(CMAKE_CXX_EXTENSIONS OFF)
+
+  # Let's nicely support folders in IDEs
+  set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+  # Testing only available if this is the main app
+  # Note this needs to be done in the main CMakeLists
+  # since it calls enable_testing, which must be in the
+  # main CMakeLists.
+  include(CTest)
+
+  # Docs only available if this is the main app
+  find_package(Doxygen)
+  if(Doxygen_FOUND)
+    add_subdirectory(docs)
+  else()
+    message(STATUS "Doxygen not found, not building docs")
+  endif()
+endif()
+
+
+# FetchContent added in CMake 3.11, downloads during the configure step
+# FetchContent_MakeAvailable was added in CMake 3.14; simpler usage
+include(FetchContent)
+
+# Accumulator library
+# This is header only, so could be replaced with git submodules or FetchContent
+find_package(OpenCL REQUIRED)
+
+link_directories(libs)
+
+#kernel code compiled
+add_subdirectory(kernels)
+
+# The compiled library code is here
+add_subdirectory(src)
+
+# The executable code is here
+add_subdirectory(simulation)
+
+# Testing only available if this is the main app
+# Emergency override MODERN_CMAKE_BUILD_TESTING provided as well
+if((CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME OR MODERN_CMAKE_BUILD_TESTING)
+   AND BUILD_TESTING)
+  add_subdirectory(tests)
+endif()
+
+#add_library(duckdb SHARED "libs/libduckdb.so" "include/duckdb/duckdb.h")
+#target_include_directories(base PUBLIC HEADER_LIST)
+
+#add_executable(simulator src/main.cpp)
+#target_link_libraries(simulator OpenCL::OpenCL duckdb)