Add CMake support

- Creates aabbcc library
- Creates Targets and Config file for easy usage by
  third party libraries using find_package(aabbcc)
- Add option to build the demo/hard_disc

Missing/TODO:
- Add option to build python wrapping
- Add target to create the header-only version

CMakeLists.txt

@@ -0,0 +1,75 @@
+cmake_minimum_required(VERSION 3.9)
+project(aabbcc
+  VERSION 0.1.0
+  LANGUAGES CXX)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+include(GNUInstallDirs) # Define CMAKE_INSTALL_xxx: LIBDIR, INCLUDEDIR
+
+option(AABBCC_BUILD_DEMOS "Build demos" OFF)
+mark_as_advanced(AABBCC_BUILD_DEMOS)
+
+add_library(aabbcc src/AABB.cc)
+set(aabbcc_include_dir src)
+set(aabbcc_export_file "${PROJECT_BINARY_DIR}/aabbccTargets.cmake")
+
+target_include_directories(aabbcc PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${aabbcc_include_dir}>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+
+install(TARGETS aabbcc
+        EXPORT aabbccTargets
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        )
+
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${aabbcc_include_dir}/AABB.h
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/aabbcc)
+
+# export to the build tree
+export( TARGETS aabbcc
+  NAMESPACE aabbcc::
+  APPEND FILE ${aabbcc_export_file})
+
+if(AABBCC_BUILD_DEMOS)
+    add_subdirectory(demos)
+endif()
+
+# Install targets and config files
+set(install_cmake_dir "${CMAKE_INSTALL_LIBDIR}/cmake/aabbcc")
+install (EXPORT aabbccTargets
+  NAMESPACE aabbcc::
+  DESTINATION ${install_cmake_dir} )
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cmake/aabbccConfig.cmake
+              ${CMAKE_CURRENT_BINARY_DIR}/aabbccConfigVersion.cmake
+              DESTINATION ${install_cmake_dir} )
+
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(aabbccConfigVersion.cmake
+  VERSION ${aabbcc_VERSION}
+  COMPATIBILITY SameMajorVersion)
+
+# Build tree
+set(aabbcc_TARGETS_FILE ${aabbcc_export_file})
+configure_package_config_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/aabbccConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/aabbccConfig.cmake
+  INSTALL_DESTINATION ${install_cmake_dir}
+  PATH_VARS aabbcc_TARGETS_FILE
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO # aabbcc does not provide components
+  INSTALL_PREFIX ${CMAKE_CURRENT_BINARY_DIR}
+  )
+
+# Install tree
+set(aabbcc_TARGETS_FILE ${CMAKE_INSTALL_PREFIX}/${install_cmake_dir}/aabbccTargets.cmake)
+configure_package_config_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/aabbccConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/cmake/aabbccConfig.cmake
+  INSTALL_DESTINATION ${install_cmake_dir}
+  PATH_VARS aabbcc_TARGETS_FILE
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO # aabbcc does not provide components
+  )
+

cmake/aabbccConfig.cmake.in

@@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+get_filename_component(aabbcc_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
+if(NOT TARGET aabbcc)
+  include ("${aabbcc_CMAKE_DIR}/aabbccTargets.cmake")
+endif()

demos/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(hard_disc hard_disc.cc)
+target_link_libraries(hard_disc PUBLIC aabbcc)