[Scons-users] emitter create dependency cycle

[Philipp Kraus]

On 2013-09-04 12:51:50 +0000, Gary Oberbrunner said:


> 

> 

> 

> On Tue, Sep 3, 2013 at 7:48 AM, Philipp Kraus 

> <philipp.kraus at tu-clausthal.de> wrote:

> Hi,

> 

> I have written a builder with an emitter. Input is a SCons.Node.FS.Dir 

> object and out SCons.Node.FS.File objects, but the input directory 

> exists, so only files will be append to the directory.

> The emitter creates the file list and returns only the files (the 

> directories are removed first). In this step I get a dependency cycle 

> between the input source dir and the returning target files.

> If I replace in the emitter the source with a pseudo name, everything 

> works fine, but I can not work with a dir object.

> 

> The emitter shows something like this

> def __emitter(target, source, env) :

>       // do something with source and create target list

> 

>      return target, source

> 

> This creates the cycle, on changing to

> return target, str(source[0])+"#pseudo"

> the cycle does not exists anymore, but the source object is not a Dir 

> object in my builder call, so I need to remove the "#pseudo"  string, 

> but in this case I can not create a new Dir object,

> eg SCons.Node.FS.Dir( str(source[0]).replace("#pseudo", "") ) does not work.

> 

> Can you use Ignore() to make the dir ignore the new files you're creating?

> 

> http://www.scons.org/doc/2.3.0/HTML/scons-user.html#AEN1275


Hi Gary,

IMHO I can use ignore, because only the targets are needed, but how can 
I use ignore in my builder script - not in my build (SConstruct) script?
I need the package call, is it SCons.Ignore, isn't it?

Thanks

Phil
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