[Scons-users] Finding targets which depend on a source file

[William Blevins]

SCons already only builds targets that are not up-to-date, so what is the
point of this script per say? I assume that you are always starting from a
fresh repository clone of some kind?

The SCons paradigm generally maps Targets to Dependencies (Sources), so you
would need to work backwards.  You might be able to get this information
from "scons --dry-run --tree=<option>" with a clever parser, but this will
require that SCons scan all the files even though it might not build
targets.

I am not sure if there is a better way.

V/R,
William

On Wed, Nov 18, 2015 at 10:53 PM, Abhishek Rai <abhishekrai at gmail.com>
wrote:

> Hello,
>
> Is there any way in scons to list all targets which depend on a given
> source file?
>
> In the code base that I'm working on, we have a "pre-commit" script which
> verifies whether the changes in the commit break any targets.  Currently,
> this script tries to build all targets.  Of course, some targets may not
> need rebuilding if the corresponding source files haven't changed since the
> previous build.  But given the dynamic nature of the code base, each run of
> the pre-commit script ends up building nearly all targets even if that
> commit affects only a small number of them.
>
> Having the ability to list all targets derived from a given source file
> will give us the ability to list out these targets first, and then only
> build those targets as part of the pre-commit workflow.
>
> Thanks!
> Abhishek
>
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