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document explicit dependencies

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Josh Holtrop 2016-03-02 13:33:00 -05:00
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README.md
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@ -394,6 +394,19 @@ not expected to be produced by the builder.
Phony targets will still be "rebuilt" if any source or the command is out of Phony targets will still be "rebuilt" if any source or the command is out of
date. date.
### Explicit Dependencies
A target can be marked as depending on another file that Rscons would not
otherwise know about via the `Environment#depends` function. For example,
to force the linker to re-link a Program output when a linker script changes:
```ruby
Rscons::Environment.new do |env|
env.Program("a.out", "foo.c", "LDFLAGS" => %w[-T linker_script.ld])
env.depends("a.out", "linker_script.ld")
end
```
### Construction Variable Naming ### Construction Variable Naming
* uppercase strings - the default construction variables that Rscons uses * uppercase strings - the default construction variables that Rscons uses