[Scons-users] Customize build decision logic for phony targets, that doesn't involve files

[Andrew Pashkin]

The problem is how to make SCons track changes in something other than 
files.

The docs for Value() 
<http://www.scons.org/doc/production/HTML/scons-user.html#f-Value> says:
> If the result of calling |str|(|value|) changes between SCons runs, 
> any targets depending on |Value|(|value|) will be rebuilt.
But it turns out, that it works only for files, right? Or SCons 
maintains some sort of database to save values between runs? Maybe it's 
worth to make a PR to teach SCons to work not only with files?
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