[Scons-users] Provide default Import to SConscript

[Hua Yanghao]

@Bill, I have managed to hack the Frame class and the
BuildDefaultGlobals() function to have some thing imported into
SConscript by default.
However I don't quite understand when the "default_import" keyword
argument passed down, somewhere somehow it end up as a set.

Any documentation to explain what is going on from Base class into
SConscript() calls regarding parameter handling?

Thanks,
Yanghao

On Sat, Feb 17, 2018 at 7:45 PM, Hua Yanghao <huayanghao at gmail.com> wrote:
> It varies a lot, ranging from 0 (yes, no source files at all) to a few
> dozen (didn't really count, see statistics below).
>
> Here is an example Linux kernel driver sub-module Makefile:
>
> linux/drivers/sn/Makefile:
>   1 #
>   2 # Makefile for the Altix device drivers.
>   3 #
>   4 #
>   5
>   6 obj-$(CONFIG_SGI_IOC3) += ioc3.o
>
> I want to replicate this kind of simplicity in scons.
>
> I actually have implemented almost the same thing in scons, but all
> those SConscript files have to start with Import("my_func") ... which
> is pretty annoying. I know I need it in every single SConscript, and I
> have to repeat it ... and this is so anti-pattern.
> I have get rid of the Return() part already, but getting rid of the
> Import() part seems not that straightforward.
>
> hua at huyangha-mobl:~/git/usw $ find . -iname "SConscript" | wc
>     121     121    5953
>
> At the moment the project supports 4 different CPU architectures, a
> little less than 1000 C files, 400K+ lines of code.
>
> And this is no small problem (at least for me). If I start working
> around it with too much python code, I might end up bypassing a
> significant portion of core scons and eventually might find it easier
> to just wrap around Makefiles.
>
> Someone thought I was criticizing scons, I actually love scons, but
> that doesn't stop me criticizing scons. ;-) Just don't see me as an
> enemy I am a serious user of scons since 10 years ago when I was still
> in college.
>
> Best Regards,
> Yanghao
>
> On Sat, Feb 17, 2018 at 4:46 PM, Bill Deegan <bill at baddogconsulting.com> wrote:
>> How many source files per SConscript?
>> That's a lot of sconscripts.
>> Is this all one project?
>> Are all the SConscripts identical?
>>
>> On Sat, Feb 17, 2018 at 3:05 AM, Hua Yanghao <huayanghao at gmail.com> wrote:
>>>
>>> Actually I have one and only one import for hundreds of SConscript :)
>>>
>>> On Sat, Feb 17, 2018 at 01:19 Jonathon Reinhart
>>> <jonathon.reinhart at gmail.com> wrote:
>>>>
>>>> Hua,
>>>>
>>>> If you are importing lots of variables into SConscripts, then you're
>>>> using SCons wrong. Most of your variables should probably be construction
>>>> variables (in the environment).
>>>>
>>>> I've written many, many SConscripts and I've never used more than 3 or 4
>>>> Import() statements in a single SConscript. Before you critique a
>>>> long-established framework, you might want to consider if you're using it
>>>> inappropriately.
>>>>
>>>> Jonathon
>>>>
>>>>
>>>>
>>>> On Fri, Feb 16, 2018 at 6:02 PM, Hua Yanghao <huayanghao at gmail.com>
>>>> wrote:
>>>>>
>>>>> Will do. It is really not good if a particular framework force user to
>>>>> create repeated code. In comparison kbuild can easily create a one line make
>>>>> file for a module.
>>>>>
>>>>> I am using localized scons anyway if not accepted will just use it on my
>>>>> own.
>>>>>
>>>>> On Fri, Feb 16, 2018 at 22:46 Bill Deegan <bill at baddogconsulting.com>
>>>>> wrote:
>>>>>>
>>>>>> Feel free to make a pull request, though I can't promise that it will
>>>>>> be accepted.
>>>>>>
>>>>>> Is it really that much of an inconvenience?
>>>>>> -Bill
>>>>>>
>>>>>>
>>>>>> On Fri, Feb 16, 2018 at 3:20 PM, Hua Yanghao <huayanghao at gmail.com>
>>>>>> wrote:
>>>>>>>
>>>>>>> Hi Bill,
>>>>>>> Do you think if it is useful to add a new keyword for
>>>>>>> env.SConscript(default_imports=[xyz,abc,...])?
>>>>>>> For return I think I can abuse some global variables. This can really
>>>>>>> make the SConscript clean/minimal.
>>>>>>>
>>>>>>> Best Regards,
>>>>>>> Yanghao
>>>>>>>
>>>>>>> On Fri, Feb 16, 2018 at 9:09 PM, Bill Deegan
>>>>>>> <bill at baddogconsulting.com> wrote:
>>>>>>> > No, there is no way without hacking the core code.
>>>>>>> >
>>>>>>> > It is the way it is by design.
>>>>>>> >
>>>>>>> > -Bill
>>>>>>> > SCons Project Co-Manager
>>>>>>> >
>>>>>>> > On Fri, Feb 16, 2018 at 2:28 PM, Hua Yanghao <huayanghao at gmail.com>
>>>>>>> > wrote:
>>>>>>> >>
>>>>>>> >> Does anyone know in scons there are ways to implicitly make a
>>>>>>> >> object
>>>>>>> >> (e.g. xyz) available for SConscript without explicity Import(xyz)?
>>>>>>> >>
>>>>>>> >> Just want to eliminate the annoying repeated Import(xyz) in every
>>>>>>> >> single SConscript.
>>>>>>> >>
>>>>>>> >> And what about implicit Return()? e.g. xyz() returns a list of
>>>>>>> >> object,
>>>>>>> >> then in every SConscript if the top level SConstruct want to
>>>>>>> >> collect
>>>>>>> >> the complete list of object returned from every single SConscript.
>>>>>>> >>
>>>>>>> >> For example:
>>>>>>> >> SConscript-1:
>>>>>>> >> Import("xyz")
>>>>>>> >>
>>>>>>> >> ret = xyz(...)
>>>>>>> >>
>>>>>>> >> Return("ret")
>>>>>>> >>
>>>>>>> >> Would ideally become:
>>>>>>> >> SConscript-2:
>>>>>>> >> xyz(...)
>>>>>>> >>
>>>>>>> >> Thanks,
>>>>>>> >> Yanghao
>>>>>>> >> _______________________________________________
>>>>>>> >> Scons-users mailing list
>>>>>>> >> Scons-users at scons.org
>>>>>>> >> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>>>> >
>>>>>>> >
>>>>>>> >
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