[Scons-users] check target must be build / is up-to-date

[Philipp Kraus]

On 2013-06-21 01:25:48 +0200, Bill Deegan said:


> I take it that you are removing the downloaded file with your extract 

> logic then?


My last answer isn't published yet, so I post it again.

Yes after I have downloaded the files, extract (cand compiled) the 
data, I do a clean or remove the downloaded
files manually. So SCons do the correct job, if all is cleaned it 
installed the data again.
My dependiecies are shown:

url => downloaded file => extracted files => compiled binary => 
installed binary

So I would like to create a check (?), that if the binary is installed 
and the URL is up-to-date, that SCons marked
the targets as "up-to-date". So I need a flag / information which can 
store this information.
For my example in detail I download the boost library (actual release 
is 1.53). So the URL is known and I installed
the library under my project dir in <project dir>/library/boost/1.53/
So if the URL returns a version and this version exists in my library 
dir, there is nothing to do for SCons.

But thanks Bill, your question is the solution. I miss the forest for 
the trees, my URL function, that reads the download
URL returns also the version and I need to check if the directory 
exsists, if it exists, I need not to create any build calls.

Phil