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README.md: add more details about Environment cloning

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Josh Holtrop 2014-03-27 12:02:46 -04:00
parent 5989e24ee6
commit 4818fd10fe
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README.md
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@ -261,10 +261,17 @@ An Rscons::Environment consists of:
* a collection of targets to build
* a collection of build hooks
When cloning an environment, the construction variables and builders are
cloned, but the new environment does not inherit any of the targets, build
When cloning an environment, by default the construction variables and builders
are cloned, but the new environment does not inherit any of the targets, build
hooks, build directories, or the build root from the source environment.
The set of environment attributes that are cloned is controllable via the
`:clone` option to the `#clone` method.
For example, `env.clone(clone: :all)` will include construction variables,
builders, build hooks, build directories, and the build root.
The set of pending targets is never cloned.
Cloned environments contain "deep copies" of construction variables.
For example, in: