Tidied the CMakeLists, moved stuff to more logical places and added comments. Also tested that ALTER_CONF=ON still works

CMakeLists.txt

@@ -10,26 +10,22 @@
 #   Print all options: cmake -LAH ..
 #
 
-
 ## CMake settings
 cmake_minimum_required (VERSION 3.5.1) # Need >= 3.8 for first-class CUDA support
 
 ## Project settings
 project(astaroth C CXX)
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
 
 ## Options
 option(BUILD_DEBUG              "Builds the program with extensive error checking"          OFF)
 option(BUILD_STANDALONE         "Builds the standalone Astaroth"                            ON)
 option(BUILD_RT_VISUALIZATION   "Builds the module for real-time visualization using SDL2"  OFF)
+option(BUILD_C_API_TEST         "Builds a C program to test whether the API is conformant"  ON)
 option(DOUBLE_PRECISION         "Generates double precision code"                           OFF)
 option(MULTIGPU_ENABLED         "If enabled, uses all the available GPUs"                   ON)
 option(ALTER_CONF               "If enabled, loads astaroth.conf from the build directory"  OFF)
 
-
-
 ## Build types
 # Available types (case-sensitive):
 # RELEASE         (best performance)
@@ -41,27 +37,24 @@ else ()
 endif()
 message(STATUS "Build type: " ${CMAKE_BUILD_TYPE})
 
-
 ## Defines
 if (DOUBLE_PRECISION)
     add_definitions(-DAC_DOUBLE_PRECISION=1)
 else ()
     add_definitions(-DAC_DOUBLE_PRECISION=0)
 endif ()
-if (MULTIGPU_ENABLED)
-    add_definitions(-DAC_MULTIGPU_ENABLED=1)
-else ()
-    add_definitions(-DAC_MULTIGPU_ENABLED=0)
-endif ()
 
 ## Include directories
 include_directories(.)
 include_directories(include)
 
 ## Subdirectories
-add_subdirectory(src/core)
+add_subdirectory(src/core) # The core library
+
 if (BUILD_STANDALONE)
     add_subdirectory(src/standalone)
 endif ()
 
-add_subdirectory(src/ctest)
+if (BUILD_C_API_TEST)
+    add_subdirectory(src/ctest)
+endif ()