add cmake support

.gitignore

@@ -35,3 +35,6 @@
 # Binary
 example
 example.exe
+
+.vscode/
+build/

CMakeLists.txt

@@ -0,0 +1,47 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 3.12)
+
+#
+# Here we check whether mio is being configured in isolation or as a component
+# of a larger project. To do so, we query whether the `PROJECT_NAME` CMake
+# variable has been defined. In the case it has, we can conclude mio is a
+# subproject.
+#
+# This convention has been borrowed from the Catch C++ unit testing library.
+#
+if(DEFINED PROJECT_NAME)
+  set(subproject ON)
+else()
+  set(subproject OFF)
+endif()
+
+PROJECT(tray C)
+
+SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+
+# Generate 'compile_commands.json' for clang_complete
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+IF(WIN32)
+	SET(CMAKE_CXX_FLAGS_RELEASE "/MT")
+	SET(CMAKE_CXX_FLAGS_DEBUG "/MTd")
+ENDIF()
+
+add_library(tray_base INTERFACE)
+
+target_compile_features(tray_base INTERFACE c_std_99)
+
+if(WIN32)
+	include(WinApiLevels)
+else()
+    add_library(tray INTERFACE)
+	target_link_libraries(tray INTERFACE tray_base)
+endif()
+
+add_library(tray::tray ALIAS tray)
+
+add_executable(tray_example example.c)
+target_link_libraries(tray_example INTERFACE tray_base)
+
+IF(NOT WIN32)
+	INSTALL(FILES tray.h DESTINATION include)
+ENDIF()

cmake/WinApiLevels.cmake

@@ -0,0 +1,14 @@
+add_library(tray_full_winapi INTERFACE)
+target_link_libraries(tray_full_winapi
+    INTERFACE tray_base
+)
+add_library(tray::tray_full_winapi ALIAS tray_full_winapi)
+
+add_library(tray INTERFACE)
+target_link_libraries(tray
+    INTERFACE tray_full_winapi
+)
+target_compile_definitions(tray
+    INTERFACE WIN32_LEAN_AND_MEAN NOMINMAX
+)
+install(TARGETS tray_full_winapi EXPORT trayConfig)