[Scons-users] Errors in parallel builds after updating from SCons 2.3.0 -> 2.3.5

[mg at ncp-e.com]

I wasn't aware that None would be problematic. It's just that I need an
"always run" Command builder that's got no input.

I've replaced it with Value(None) but it didn't change anything.

So you think issuing new directives while executing cmdFunc in the
example below doesn't pose a problem?
As that's the spot in which my build breaks. The "env.Install" line
leads to the exception within SCons internals.

On Mon, Sep 28, 2015 at 06:34:48PM +0200, Bill Deegan wrote:
>    Your target node for the Command is None.
>    That's likely your issue. You're specifying None as a Node object.
> 
>    You should likely use Value(None) or something like that.
>    Search for "Value(" in
>    [1]http://scons.org/doc/production/HTML/scons-man.html
> 
>    -Bill
>    On Mon, Sep 28, 2015 at 9:29 AM, <[2]mg at ncp-e.com> wrote:
> 
>      >    Can you share any code so we can understand what you're talking
>      about?
> 
>      Of course. I broke it down to this:
> 
>      ------------------------------------------------------------------------
>      env = Environment()
> 
>      def cmdFunc(target, source, env):
>              fstab_inst = env.Install("./install", "/etc/fstab")
> 
>      env.Command(
>              "some_cmd",
>              None,
>              cmdFunc,
>      )
>      ------------------------------------------------------------------------
> 
>      So I'm adding a new target during execution of the Command builder. It
>      works in this example and even in my more complex case. The latter as
>      long as I don't use multiple jobs in SCons > 2.3.0.
> 
>      From the SCons documentation I'm not clear if this kind of code is even
>      allowed.
> 
>      Thanks
>      Matthias
> 

-- 
Matthias Gerstner, Dipl.-Wirtsch.-Inf. (FH)
Entwicklung
 
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