[Scons-users] emitter create dependency cycle

[Philipp Kraus]

On 2013-09-03 11:48:13 +0000, Philipp Kraus said:


> 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.

> 

> I need a solution to rename the single source object and transfer it to 

> the builder call and use it in the builder than a Dir object


eg my source directory is librarydir/ and the emitter should return 
librarydir/file1, librarydir/file2, library/file3, so I get the cycle 
between source and target

Phil