Display a warning if the game's version is incompatible.

src/love.cpp

@@ -95,6 +95,13 @@ extern "C" LOVE_EXPORT int luaopen_love(lua_State * L)
 	lua_pushstring(L, love::VERSION);
 	lua_setfield(L, -2, "_version");
 
+	lua_pushnumber(L, love::VERSION_MAJOR);
+	lua_setfield(L, -2, "_version_major");
+	lua_pushnumber(L, love::VERSION_MINOR);
+	lua_setfield(L, -2, "_version_minor");
+	lua_pushnumber(L, love::VERSION_REV);
+	lua_setfield(L, -2, "_version_revision");
+
 	lua_pushstring(L, love::VERSION_CODENAME);
 	lua_setfield(L, -2, "_version_codename");
 

src/scripts/boot.lua

@@ -225,7 +225,7 @@ function love.init()
 	local c = {
 		title = "Untitled",
 		author = "Unnamed",
-		version = 0,
+		version = love._version,
 		screen = {
 			width = 800,
 			height = 600,
@@ -315,6 +315,33 @@ function love.init()
 		love._openConsole()
 	end
 
+	-- Check the version
+	local compat = false
+	c.version = tostring(c.version)
+	for i, v in ipairs(love._version_compat) do
+		if c.version == v then
+			compat = true
+		end
+	end
+	if not compat then
+		local major, minor, revision = c.version:match("^(%d+)%.(%d+)%.(%d+)$")
+		if (not major or not minor or not revision) or (major ~= love._version_major and minor ~= love._version_minor) then
+			local msg = "This game was made for a version that is probably incompatible.\n"..
+				"The game might still work, but it is not guaranteed.\n" ..
+				"Furthermore, this means one should not judge this game or the engine if not."
+			print(msg)
+			if love.graphics and love.timer and love.event then
+				love.event.pump()
+				love.graphics.setBackgroundColor(89, 157, 220)
+				love.graphics.clear()
+				love.graphics.print(msg, 70, 70)
+				love.graphics.present()
+				love.graphics.setBackgroundColor(0, 0, 0)
+				love.timer.sleep(3)
+			end
+		end
+	end
+
 end
 
 function love.run()

src/scripts/boot.lua.h

@@ -377,7 +377,8 @@ const unsigned char boot_lua[] =
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@@ -531,6 +532,71 @@ const unsigned char boot_lua[] =
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