[Scons-users] Emiter usage

Tue Sep 20 05:02:28 EDT 2016

Hi,

I wasn't sure if when I run SConscript(...) in for loop dependencies will
be intact. As dependency check is not sequential and I do not know how
SCons files are parsed on 'scons' call.

Here is working (just fine) example of my dilemma above:
https://github.com/pholat/sconplay/tree/master

I'll add 3 different Environments so that it will match my previous example.

Great thanks, best regards,
Adam

Pozdrawiam,
Adam A. Dobrowolski || pholat

2016-09-20 1:49 GMT+02:00 Bill Deegan <bill at baddogconsulting.com>:

> Adam,
>
> On Mon, Sep 19, 2016 at 1:59 PM, Adam Dobrowolski <pholat at gmail.com>
> wrote:
>
>> On poniedziałek, 19 września 2016 13:09:34 CEST Bill Deegan wrote:
>> > Adam,
>> >
>> > On Mon, Sep 19, 2016 at 12:47 PM, Adam Dobrowolski <pholat at gmail.com>
>> wrote:
>> > > Hi,
>> > >
>> > > I want to build all four elements which have "Alias" at once, I've
>> added
>> > > Alias
>> > > to mark that these are end products.
>> > > Right now the main question is if SCons will recognize intermediate
>> files
>> > > needed if I loop over them, not write them by hand/copy in
>> SConsctruct.
>> > > I vaguely recall that SConstruct & SConscripts are being parsed
>> before any
>> > > functions are executed.
>> >
>> > Can you expand upon what would be in:
>> > X86_REL = SConscript("x86_release/SConcsript")
>> >
>> > What would you expect to be in X86_REL?
>> >
>> > I'm guessing that you don't realize that it's not necessary to pass
>> around
>> > the Node's returned from builders if you know the locations in the
>> > filesystem that their targets will be built in.
>> >
>> > So if a SConscript builds a bunch of binaries into : x86_release/bin,
>> you
>> > can create the alias either as:
>> >
>> > Alias('X86_REL','x86_release/bin')
>> >
>> > or if you like
>> >
>> > Alias('X86_REL',Glob('x86_release/bin/*'))
>> >
>> > Does that answer your question?
>>
>> As it was said in example:
>> (...)
>> These SConscripts use products of earlier SConscripts in for loop
>> For 10 SCOnscripts it would be 40 products in total
>> These are sourced with Glob("*")
>> (...)
>>
>> SConscript creates bunch of libraries which are Globed and compiled into
>> four
>> different binaries. I said products previously because I may have
>> different
>> builders that Program(..) and Library(..) in use.
>>
>
> You'll need to pastebin your builders for us to help you with that.
>
>>
>> So it doesn't answer my question.
>>
>
> If the alias should cause the respective binaries (and all their
> dependencies to be built), then specifying just the binaries to the alias
> is sufficient.
> In which case I did previously answer your question.
>
> -Bill
>
>
>>
>> >
>> > > So right now it's a question on SCons dependency handling.
>> > > ---
>> > > By the way:
>> > > The mail has "Emitter usage" in name because:
>> > > 1) I ate word "question" - sorry for that, I've just found it out.
>> > > 2) I read manual: http://scons.org/doc/1.2.0/HTM
>> L/scons-user/x3603.html
>> > > and I
>> > > thought that maybe I could do something similar. In the end I still
>> see no
>> > > use
>> > > in emitter in my case and can't grasp when I would need it. ( I would
>> be
>> > > grateful to any explanations though )
>> >
>> > Are you creating a builder? If not then you don't need it.
>> > Does the builder you're creating create output files (or input files, or
>> > sideffects) which aren't listed as a target or source when the builder
>> is
>> > invoked?
>> > Then you do need an emitter.
>> > Otherwise you don't need one.
>> >
>> >
>> > Are you running SCons 1.2.0? The current version is 2.5.0.
>> >
>> > > Best regards,
>> > > Adam
>> > >
>> > > On poniedziałek, 19 września 2016 19:31:56 CEST Dirk Bächle wrote:
>> > > > Adam,
>> > > >
>> > > > On 19.09.2016 18:46, Adam Dobrowolski wrote:
>> > > > > Hi Dirk,
>> > > > >
>> > > > > Great thanks up to now, I meant something like that:
>> > > > >
>> > > > > #!/bin/python
>> > > > >
>> > > > > x86_env = Environment(<something for x86);
>> > > > > x86_deb = env.Clone();
>> > > > > x86_deb.Append(CXXFLAGS=['-g3','-O2'])
>> > > > > arm_env = Environment(<something for arm>);
>> > > > > arm_deb = env.Clone();
>> > > > > arm_deb.Append(CXXFLAGS=['-g3','-O2'])
>> > > > >
>> > > > > libs = [
>> > > > >
>> > > > >          "lib1/SConscript",
>> > > > >          "lib2/SConscript",
>> > > > >          "lib3/SConscript",
>> > > > >          (...)
>> > > > >          "libN/SConscript",
>> > > > >          ]
>> > > > >
>> > > > > for script in libs:
>> > > > >      SConscript(script, exports={'env' : x86_env},
>> > > > >      variant_dir='x86_release')
>> > > > >      SConscript(script, exports={'env' : x86_deb},
>> > > > >      variant_dir='x86_debug')
>> > > > >      SConscript(script, exports={'env' : arm_env},
>> > > > >      variant_dir='arm_release')
>> > > > >      SConscript(script, exports={'env' : arm_deb},
>> > > > >      variant_dir='arm_debug')
>> > > > >
>> > > > > # These SConscripts use products of earlier SConscripts in for
>> loop
>> > > > > # For 10 SCOnscripts it would be 40 products in total
>> > > > > # These are sourced with Glob("*")
>> > > > > X86_REL = SConscript("x86_release/SConcsript")
>> > > > > X86_DEB = SConscript("x86_debug/SConcsript")
>> > > > > ARM_REL = SConscript("arm_release/SConcsript")
>> > > > > ARM_DEB = SConscript("arm_debug/SConcsript")
>> > > > >
>> > > > > Alias('X86_REL',X86_REL)
>> > > > > Alias('X86_DEB',X86_DEB)
>> > > > > Alias('ARM_REL',ARM_REL)
>> > > > > Alias('ARM_DEB',ARM_DEB)
>> > > >
>> > > > what I get from this is that you want to be able to call "scons
>> > > > X86_REL",
>> > > > such that only the corresponding subtree is built. If this
>> > > > is correct, doesn't it contradict the specifications made in your
>> first
>> > >
>> > > mail:
>> > > >  > What I need to do is:
>> > > >  > Generate different output on different compilation variable.
>> > > >  >
>> > > >  > Exemplary problem: one app version is build with -DDEBUG
>> variable,
>> > > >  > and
>> > > >  > second one is without. Now I can build DEBUG app (or one
>> without) by
>> > > >  > changing the Environment by hand. But I would love to build both
>> in
>> > >
>> > > one
>> > >
>> > > >  > run.
>> > > >
>> > > > , especially for the last sentence?
>> > > >
>> > > > Regards,
>> > > >
>> > > > Dirk
>> > > >
>> > > >
>> > > > _______________________________________________
>> > > > Scons-users mailing list
>> > > > Scons-users at scons.org
>> > > > https://pairlist4.pair.net/mailman/listinfo/scons-users
>> > >
>> > > _______________________________________________
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>>
>>
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