Re: [jamboost] [SOLVED] Re: (BBv1 and BBv2) Unnecessary compiles due to header/directory name c

From: Rene Rivera (grafik.list_at_[hidden])
Date: 2004-11-17 12:00:51

c_andy_martin wrote:

>>After a long investigation, and much hair pulling, I found the
> 
> "problem" 
> 
>>and hacked a solution.
> 
> Wow! Thanks!
> 
> 
>>The problem is a basic issue with the SEARCH capability of Jam. Simply 
>>put it makes no distinction between files and directories. Which means 
>>that it will match a directory to a header without question. 
>>Unfortunately this is something that is not easy to fix in Jam itself.
> 
> That would make sense from the behavior observed. So is it really that
> hard to patch bjam? Or is it some fundamental problem with the
> language? (Would the Jam grammar now be different, or the semantics of
> the SEARCH keyword be different -- I'm totally unfamiliar with the
> underlying Jam language).

The problem is changing SEARCH such that it doesn't break the other uses 
it's put to for finding targets which must include directories. So in 
this case it is hard to patch bjam because this is a feature used in 
many places. So changing it for one use will kill the others. I did try 
one small change to it and only succeeded in preventing bjam from 
building itself :-\

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