add verbosef

src/_premake_init.lua

@@ -1053,6 +1053,12 @@
 		description = "Display this information"
 	}
 
+	newoption
+	{
+		trigger     = "verbose",
+		description = "Generate extra debug text output"
+	}
+
 	newoption
 	{
 		trigger = "interactive",

src/base/_foundation.lua

@@ -211,3 +211,12 @@
 	function printf(msg, ...)
 		print(string.format(msg, unpack(arg)))
 	end
+
+--
+-- A shortcut for printing formatted output in verbose mode.
+--
+	function verbosef(msg, ...)
+		if _OPTIONS.verbose then
+			print(string.format(msg, ...))
+		end
+	end