[Scons-users] Newbie questions

[syost at triad.rr.com]

Thanks Bill,

Not near the laptop right now but Python 2.7 I believe installs with Ubuntu 16.04 which I am running.   I know it is not python 3.x because you have to type "python3" to run it.

The underlying packages have nothing in terms of SCons artifacts - just to the top repository level.   I then added an SConscript to a single package as a guinea pig while I wrote a builder for a database precompilation step.   This never was read.   Here is the directory structure:

myrepo   S*.py* files and SConstruct and SConscript (as generated by SConsolidator) are here.
------com
----------company
-----------------ss
-------------------functionalarea1
----------------------------------program11    (trying to add SConscript here for special pre-compile steps)
----------------------------------program.1N
-------------------functionalarea2
----------------------------------program21    
----------------------------------program.2N
.....and so on.......


If my PWD is "myrepo" and I type "scons -k" I actually get lots of successful package builds through the tree (or packages fail for predictable and understandable reasons). In this scenario program11 compiles like any other but fails to include my special SConscript steps(and print statements prove it is never read).   Also, if I type scons -k com/company/ss/functionalarea1/program11 it will build fine too - but once again it builds without including my SConscript

If I change my PWD to "program11", add a SConstruct, and then type "scons -k" my SConscript is properly read.   But of course, then I would have to build separately for several hundred packages since most will have special linking, special compiler flags, special DB steps, or post steps(ie perms), install directives, etc.  Not ideal and not what I was hoping for.


Bottom line is the SConstruct generated by SConsolidator at the top "myrepo" directory seems (again - not a python expert) to include the necessary logic to walk the subdirs and call SConscript() for each SConscript() it finds but they actually seem to be ignored.  So I figured I am doing something wrong and hoped you folks could help.

Thanks in advance!!


---- Bill Deegan <bill at baddogconsulting.com> wrote: 
> Spencer,
> 
> Greetings and welcome!
> 
> So the underlying packages already had a SCons based build system?
> Or did you generate one for each package and then are trying to wrap them
> with a SConstruct on top?
> 
> Also what platform? Which version of python? Which version of SCons?
> 
> 
> -Bill
> 
> On Fri, Apr 21, 2017 at 1:22 PM, Spencer Yost <syost at triad.rr.com> wrote:
> 
> > I am setting up a new development environment for work, and I am seriously
> > looking at SCons as a replacement for our Frankenstein build system that we
> > currently have. I like what I see so far but I'm having some trouble
> > understanding the underlying architecture.
> >
> > Note1:  I have been experimenting quite a bit, and I have read the users
> > guide and man pages
> >
> > Note 2:  I'm an experienced C and C++ developer  but I've never touched
> > Python  before.
> >
> > Note 3:  Our code base has approximately 10K-15K files, found in several
> > hundred packages in a hierarchical reverse domain organization.  This is
> > set up in one git repository.
> >
> > So I installed Scons on my Ubuntu laptop and SCons builds a lot of
> > packages out of box quite nicely.
> >
> > But some files and packages need to be treated specially before they can
> > be built.   The Sconstruct  file (originally generated by SConsolidator in
> > eclipse) appears like scons will look for sconscript files  in each
> > individual package, but it doesn't.  Any SConscript file I place in an
> > individual package for extra processing, does not appear to be read.
> >
> > The only way I seem to be able to build a package with an SConscript file
> > is to also create an SConstruct file, and build using that package as my
> > current base directory.
> >
> >
> > Am I mistaken? Should I not be able to include a separate SConscript file
> > in each package for the individual needs of the individual package yet
> > initiate the build from the top of the hierarchy?
> >
> > Thanks in advance!
> >
> > PS:  Same thing happens if I try to build from Eclipse with SConsolidator.
> >
> > Spencer Yost
> > _______________________________________________
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> > Scons-users at scons.org
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> >