[Scons-users] Fwd:Re: timing issues and protecting from them
Tom Tanner (BLOOMBERG/ LONDON)
ttanner2 at bloomberg.net
Thu Dec 10 08:42:20 EST 2015
Thanks. I'll start poking around in those places.
And yes, an indirect dependency can safely change because it isn't part of your signature. Only the direct dependencies are.
a,o depends on a.hh, a.cc
a.lib depends on a.o
scons starts build
scons builds a.o and updates tree
idiot^H^H^H^H^Huser changes a.hh
scons build a.lib
You don't have an inconsistency. You do have a requirement to rebuild, but nothing is inconsistent.
From: dl9obn at darc.de At: Dec 10 2015 10:39:05
To: scons-users at scons.org
Subject: Re: [Scons-users] Fwd:Re: timing issues and protecting from them
On 10.12.2015 09:13, Tom Tanner (BLOOMBERG/ LONDON) wrote:
> Well, I can check the timing for that. But I don't see a necessity for
rechecking the indirect dependencies
so an indirect dependency may change during a build, but a direct source not?
This doesn't really make sense to me...but I
understand where you're coming from. You have experienced this phenomenon of
"hard to track down" build errors several times now,
and want to do something about it. So please, as I mentioned in my earlier
mail, start on an implementation for this feature if you
find the time. The execute() and executed_with_callbacks() methods in the
Taskmaster look like the best place to do that.
To me, this seems more like a job for the Taskmaster than putting new code in
the Node() methods build()/built().
I'd derive a new ParanoidTaskmaster from the original class and then add my
checks to that. This also includes generalizing the
creation of the "Taskmaster" in the Main.py script, such that you can select
between the "default" and your new version via a
Finally, the really paranoid people clearly separate builds from their edit
cycles by building the final stuff on a different server
for example. I happen to work in one of those places ;)...and we always build
against fixed labels.
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