[Scons-users] Batch building includes unchanged targets

[Bill Deegan]

Dirk,

If I remember correctly the batch compilation logic was only implemented
(By Steven Knight (?)) for the visual C compiler.
With the intent that at some point it would be generally implemented. I'm
not sure how much plumbing is in place.

-Bill


On Fri, Oct 25, 2013 at 2:26 PM, Dirk Bächle <tshortik at gmx.de> wrote:


> Sean,

>

>

> On 25.10.2013 21:33, Sean Houghton wrote:

>

>>

>> I guess "batch building" is an overloaded phrase.  In my experience batch

>> building means processing a set of independent items that all share a

>> common processing pipeline.  In my case I'm submitting the items to be

>> built to a distributed build system that does a better job scheduling if it

>> knows about all of the items up front rather than one at a time.

>>

>>

> this sounds very interesting. Which distributed build system are we

> talking about? And if you already seem to have a good way of building

> things, which role do you want SCons to play?

>

>

>

>  What's the purpose of the targets="$CHANGED_TARGETS" parameter?  There's

>> no documentation on the batch building so I'm trying to learn all I can by

>> following the MSVC builder in the source.

>>

>>  Yeah, documentation about this is scarce and I'd have to dig into the

> source code now to give you a correct answer. The MAN page lists all the

> reserved variables (like CHANGED_TARGETS) with a short explanation of

> each...

>

>

>  I'm looking at possibly using Node.changed() to skip processing

>> source/target pairs that haven't changed since the last build.  This looks

>> promising but I don't like bypassing the built in behavior if I don't have

>> to.

>>

>>

> I don't think you'll have to hack around in the core like that. From what

> I understood so far, this is exactly what "$CHANGED_TARGETS" is

> for...picking and processing only the targets that aren't up-to-date and

> need a rebuild.

>

>

> Regards,

>

> Dirk

>

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