[Scons-users] How to force a re-building of a cached file using the env.CacheDir() feature.

[Bill Deegan]

Why are you trying to do this?
Is SCons misbehaving?

On Wed, Jan 18, 2023 at 4:42 PM Don Baldwin <donb at qti.qualcomm.com> wrote:

> How does one find the bsig for a file?  I don't see that in the sconsign
> output.
>
> Thanks,
> Don
>
> -----Original Message-----
> From: Scons-users <scons-users-bounces at scons.org> On Behalf Of Mats
> Wichmann
> Sent: Wednesday, January 18, 2023 12:08 PM
> To: scons-users at scons.org
> Subject: Re: [Scons-users] How to force a re-building of a cached file
> using the env.CacheDir() feature.
>
> WARNING: This email originated from outside of Qualcomm. Please be wary of
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>
> On 1/18/23 12:33, Don Baldwin wrote:
> > Hi,
> >
> > We’re looking into using the SCons target-caching feature (using the
> > env.CacheDir() method), and there is a question of how to force a
> > re-caching of a particular file.  Is there a way to do this?
>
> --cache-force, basically.  There's not any particular granularity to it...
> I don't think you can give a limited list of targets (one or more) and have
> only those be updated.
>
> there's also an old issue with a patch which separates --cache-force and
> --cache-populate (which are currently synonyms) so that they don't behave
> exactly the same - though the proposed new behavior of of --cache-populate
> is rather the opposite of what you're looking for, it doesn't update any
> existing cached files (#1908).
>
> > I looked into trying to find out the md5 value of a file, and then
> > deleting the cached file directly, and I’m running the ‘sconsign’ tool
> > on the .sconsign.dblite file with the -c option to get the csig value,
> > which I think is the same thing as the md5, but those values don’t
> > seem to match any of the filenames stored in the cache.
>
> turns out the "build signature" (bsig) is what is used to generate the
> cache file name, not the content signature.
>
>
>
>
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