[Scons-users] What affects rebuilding?

[William Blevins]

I didn't expect the patch to work correctly, or it would have already been
included.  I just wanted to know if you thought it was related.

I assume it wasn't.

V/R,
William

On Tue, Jun 30, 2015 at 2:02 PM, Dirk Bächle <tshortik at gmx.de> wrote:

> Hi Douwe,
>
> On 30.06.2015 17:04, Douwe Gelling wrote:
>
>> I don't know specifics of scons, but it seems to me this isn't the issue.
>> I've applied the patch to be certain, and it doesn't work
>> in any case.
>> It almost looks like the wrong files are compared when using variantdir,
>> or perhaps some fields of the File object are being compared
>> that shouldn't be. I'll have a look at the changed_since_last_build
>> function, see what fields are compared.
>>
>>
> your output messages from "--debug=explain" look a lot as if your actual
> files stay unchanged (equal hashsum), but the order in which they are found
> is different from run to run. This can happen when you have Builders like
> SWIG, or any custom Builder, which create headers or programs that are then
> used in the further build. In this way they are implicit dependencies and
> have to get checked on an update.
> In the first run the created files don't exist initially, but in the
> second they do...so you get a different order in which files are found
> during the build phase.
>
> Does your build keep quiet (no changes) when you run it a third time? Then
> you might also try to switch the implicit dependency detection for commands
> to "off", as described in
> http://stackoverflow.com/questions/11564403/how-do-i-tell-scons-to-ignore-implicit-dependencies-from-command-actions
> for example.
>
> Hope this helps you a little further.
>
> Best regards,
>
> Dirk
>
>
>
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