[Scons-users] dependencies on directories

[Tom Tanner (BLOOMBERG/ LONDON)]

Oh, right. Thats really interesting, thank you. I'll have a look around and see what I can tease out when I'm at home over the next few days.

As far as I'm aware I'm using your QT5 tool (I tried going onto the default Qt tool but it didn't seem to work nearly as well), and the Install tool (my favourite for likely culprit), but that is on scons 2.3.7 - as I noted, I've not done a complete build with 2.4.1 yet, so it might no longer be a problem.

From: dl9obn at darc.de At: Dec 28 2015 11:37:22
To: scons-users at scons.org
Subject: Re: [Scons-users] dependencies on directories

                  Hi Tom,
    
    
On 28.12.2015 11:45, Tom Tanner       (BLOOMBERG/ LONDON) wrote:
         
                   
After I persuaded the guy in question to fix *his* dependencies, I discovered that the 'Install' builder appears to do something similar but different. It appears to generate a directory as a target. And the dependencies are strange indeed. Because the directory appears to depend on files that don't exist but *might*. 
For instance I get the following list of dependencies:
    bahblah/dirname:
          source/this.h
          source/this.hpp
          source/this.hh
          source/this.hxx    
     
    I think I know where that comes from. Some Tools use the call     "File.rexists()" to check whether an accompanying file like     "foo.hpp" exists for a source "foo.c". The problem is, that the File     node gets added by this function if it doesn't exist...and that's     where all the extra files come from.
    In one of the last revisions (     https://bitbucket.org/scons/scons/pull-requests/193/new-method-rentry_exists_on_disk/diff     ), I added the new method "Dir.rentry_exists_on_disk()" which only     peeks onto the disk, but doesn't create new nodes.
    However, the Tools haven't all been switched to the new method, yet.     Can you name the tools that you use, so we might come up with an     attack plan for this?
    I'm really interested in this topic because I ran into the same     problems you seem to have now, when trying to combine the Qt4 Tool     with RPM packaging of the sources automatically...
    
    Best regards,
    
    Dirk
    
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