Colin Cross 68f55102da Support dependencies on environment variables ... Ninja can't depend on environment variables, so modifying build behavior based on environment variables requires coordinating between the soong script that invokes ninja and the soong_build manifest generator. Allow any module to call Config.Getenv to get the contents of an environment variable while registering a dependency on it. After all modules have been processed write out the state of all used environment variables to a JSON file called .soong.environment. During the next build the soong script will use the soong_env tool to compare the contents of .soong.environment to the current environment, and force a build manifest regeneration by deleting the .soong.environment file if any variables have changed. Change-Id: Id0d81933a857bc2fc1cd7a393a3c6cec73dc4824		2015-03-26 14:13:49 -07:00
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soong_env.go	Support dependencies on environment variables	2015-03-26 14:13:49 -07:00