[Scons-users] emitter create dependency cycle

William Deegan bill at baddogconsulting.com
Thu Sep 5 16:06:04 EDT 2013


Phil,

Don't have Dir's in your target's or Sources. Just have files.

-Bill
On Sep 4, 2013, at 9:17 PM, Philipp Kraus <philipp.kraus at tu-clausthal.de> wrote:


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 One thing to consider is whether such and object should always be considered out of date if any file in the directory (and possibility in it's sub-directories recursively) has changed.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

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