[Scons-users] Dealing with headers appearing from Command builders

Bill Deegan bill at baddogconsulting.com
Wed Apr 8 09:33:10 EDT 2015

Split your building in to two:
1) downloads the package and puts in the correct dir in your tree
2) takes the downloaded package and builds it.  (at this point the emitter
or perhaps a scanner can determine the output files).


On Wed, Apr 8, 2015 at 6:36 AM, <mg at ncp-e.com> wrote:

> Hi Dirk,
> thank you for your input.
> > Ditching the Command approach, and implementing customized Emitters
> > for your package Builder(s) is probably the way to go.
> Okay if I understand you right you suggest writing a fully fledged
> Builder and Emitter that gives SCons all the information to correctly
> understand what happens. I've done this already for other, simpler
> cases.
> But as I see it my problem is - even if using an Emitter - that I need
> to know in advance what headers at what locations will result from
> third-party package builds.
> For example, many third party packages use autotools as a build system.
> So my current Command builder fetches some version of the package
> archive, extracts it, calls configure, make and make install and only
> then I really know what the resulting output is.
> The input file, like some "package.tar.gz" results in a directory
> containing a bunch of headers and libraries etc. The process
> from input to output is pretty much opaque to me until the whole thing
> is finished.
> Knowing this only after the target is built doesn't really help me in
> the context of an Emitter or am I missing something?
> Thanks and regards,
> Matthias
> --
> Matthias Gerstner, Dipl.-Wirtsch.-Inf. (FH)
> Entwicklung
> NCP engineering GmbH
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