Add --fatal flag to treat Premake script warnings as errors

src/_premake_init.lua

@@ -813,6 +813,12 @@
 		}
 	}
 
+	newoption
+	{
+		trigger     = "fatal",
+		description = "Treat warnings from project scripts as errors"
+	}
+
 	newoption
 	{
 		trigger     = "file",
@@ -846,7 +852,7 @@
 	newoption
 	{
 		trigger     = "scripts",
-		value       = "path",
+		value       = "PATH",
 		description = "Search for additional scripts on the given path"
 	}
 

src/base/_foundation.lua

@@ -172,7 +172,12 @@
 --
 
 	function premake.warn(message, ...)
-		io.stderr:write(string.format("** Warning: " .. message .. "\n", ...))
+		message = string.format(message, ...)
+		if _OPTIONS.fatal then
+			error(message)
+		else
+			io.stderr:write(string.format("** Warning: " .. message .. "\n", ...))
+		end
 	end