[Scons-users] emitter create dependency cycle

[Philipp Kraus]

Hi Bill,

do you know some workaround / fix to solve this problem at the moment?


Phil



Am 05.09.2013 um 00:33 schrieb Bill Deegan <bill at baddogconsulting.com>:


> Phil,

> 

> The problem you're running into (I think) is that SCons implicitly adds a dependency to a directory for each file in it.

> The net is you need to deal with files and not directories or you will run into this issue.

> 

> I do agree however that we need a way to deal with directories as an object and not just a container with the implicit dependencies as a source and as a target.

> One thing to consider is whether such and object should always be considered out of date if any file in the directory (and possibility in it's sub-directories recursively) has changed.

> 

> -Bill

> 

> 

> On Wed, Sep 4, 2013 at 6:19 AM, Philipp Kraus <philipp.kraus at flashpixx.de> wrote:

> On 2013-09-04 13:05:54 +0000, Gary Oberbrunner said:

> 

> 

> 

> 

> 

> 

> 

> 

> 

> On Wed, Sep 4, 2013 at 9:01 AM, Philipp Kraus <philipp.kraus at flashpixx.de> wrote:

> 

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

> 

> ...

> 

> 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?

> 

> 

> 

> I usually do

> 

>  from SCons.Script import *

> 

> then you can write things in your external script the same as in SConscript.  

> 

> 

> 

> http://www.scons.org/doc/2.3.0/HTML/scons-user.html#AEN3822

> 

> 

> 

> I get always the dependy cycle. My emitter shows:

> 

> 

> 

> def __GitFileListEmitter( target, source, env ) :

> 

>     cmd    = env.subst(env["mycommand"], source=source)

> 

>     handle = subprocess.Popen( cmd, shell=True, stdout=subprocess.PIPE )

> 

>     target = handle.stdout.readlines()

> 

>     handle.communicate()

> 

>     if handle.returncode <> 0 :

> 

>         raise SCons.Errors.StopError("error [%s]" % (cmd, source[0]) )

> 

> 

> 

>     target = list(set( [os.path.join(source[0].abspath, i.strip()) for i in target] ))

> 

>     SCons.Script.Ignore(target, source)

> 

>     return target, source

> 

> 

> 

> For my test build with Lua Bridge shows a cycle:

> 

> 

> 

>   library/build/lua/bridge/README.md -> library/build/lua/bridge/Source/LuaBridge/detail/Constructor.h -> library/build/lua/bridge/Source/LuaBridge/detail -> library/build/lua/bridge/Source/LuaBridge -> library/build/lua/bridge/Source -> library/build/lua/bridge/Manual.html -> library/build/lua/bridge/index.html -> library/build/lua/bridge/README.md

> 

> 

> 

> If I remove source[0].abspath everythings fine, but the resulting files are incorrect (path is incorrect)

> 

> 

> 

> The Ignore call should IMHO ignore any connection between each target and source, but this seems to be a cycle between the targets. Each target has got a unique path, but all targets in the "source" directory. source is a single Dir object and target should be only a list of files. 

> 

> 

> 

> Thanks a lot

> 

> 

> 

> Phil

> 

> 

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