[Scons-users] Emiter usage

[Adam Dobrowolski]

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.

So it doesn't answer my question.

> 
> > 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/HTML/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
> > > 
> > > 
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