[Scons-users] emitter create dependency cycle

[Bill Deegan]

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considered out of date if any file in the directory (and possibility in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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