[Scons-users] Is there something like a try-finally surrounding for multiple actions in scons?

[andreas.ames at de.transport.bombardier.com]

Hi Dirk,

thanks for your information.

I'm using pseudo builders quite regularly but I don't understand how I can 
solve my problem.  I guess that my description of the problem was unclear.

In the meantime I found the batch_key parameter in the constructor of 
build actions.  AFAIU it could help solving my issue.  Rebuilding only 
necessary out-dated targets seems to be supported by the CHANGED_SOURCES 
entry of the construction environment and build those targets in a loop 
with the preparation and the tear-down processes executed before and after 
that loop.

I will try that.


cheers,

aa
  
Please consider the environment before you print / Merci de penser à 
l'environnement avant d'imprimer / Bitte denken Sie an die Umwelt bevor 
Sie drucken 

Bombardier Transportation GmbH 
Vorsitzender des Aufsichtsrats / Chairman of Supervisory Board: Prof. Dr. 
Wilhelm Bender 
Geschäftsführung / Executive Board: Michael Clausecker 
(Vorsitzender/Chairman), Dr. Susanne Kortendick, David Barry, Matthias 
Keller 
Sitz der Gesellschaft / Principal Office: Berlin 
Registergericht / Registration Court: Amtsgericht Charlottenburg, HRB 
64838 






Dirk Bächle <tshortik at gmx.de>
Sent by: scons-users-bounces at scons.org
14.11.2013 20:11

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Re: [Scons-users] Is there something like a try-finally surrounding for 
multiple actions in scons?







Hi Andreas,

given your description below I think you should a have a look at 
pseudo-Builders. You can find more infos about them in the manual, "chap. 
20, Pseudo-Builders: the AddMethod function",

  http://www.scons.org/doc/production/HTML/scons-user/c3938.html

and in the

  http://www.scons.org/wiki/ToolsForFools

guide. For a more practical example have a look at the Qt4/Qt5 tools (see 
our index at http://www.scons.org/wiki/ToolsIndex ), e.g. the Ts4() 
Builder.

If you have further questions or get stuck, please don't hesitate to ask 
again.

Best regards,

Dirk

On 14.11.2013 12:42, andreas.ames at de.transport.bombardier.com wrote:

Hi all, 

I have a local Builder defined as follows: 

sql_gen = SCons.Script.Builder(action = _primos_sql_gen 
                               , emitter = _primos_sql_gen_emitter 
                               , source_scanner = PrimosSqlGenScanner 
                               , src_suffix = '.sql' 
                               , suffix = '.c' 
                               , single_source = 1) 

Please note, that it is a single-source builder.  I call it with a long 
list of sources (like 60 input files).  The action is a python function 
and I like that the builds of the individual targets are nicely seperated 
from each other. 

However the performance of this approach is somewhat lacking as the the 
function _primos_sql_gen has to call an expensive preparation process and 
an equally expensive tear-down process in a try-finally environment. 

Thus I'm wondering if there is any mechanism avaiable in scons that allows 
me to: 

1. Make sure that scons builds all out-of-date targets defined by a single 
call to the Builder (with multiple sources) in sequence without scheduling 
other build actions from different builders in between this sequence. 
(This is necessary as the preperation step has side-effects that might 
influence other build actions.) (NB: A more flexible approach would be to 
provide a way to define such a non-premptable sequence as a list of 
targets whose build actions must always be executed in sequence.) 

2. Specify one preparation and one tear-down process around that sequence. 
 It would be good if there was a way to run the tear-down step regardless 
of the way the action sequence is ended (i.e. even in the face of 
exceptions). (NB: This could be specified as hooks, i.e. python function 
callbacks, for the sequence mentioned above.) 

Such a mechanism would allow me to speed-up my build considerably while 
preseving the nice modularisation and self-containedness of my current 
approach. 

Please note, that it would not be necessary in my case to require 
transactional semantics from such a mechanism. 


Thanks in advance, 

aa
 
 
Please consider the environment before you print / Merci de penser à 
l'environnement avant d'imprimer / Bitte denken Sie an die Umwelt bevor 
Sie drucken 

Bombardier Transportation GmbH 
Vorsitzender des Aufsichtsrats / Chairman of Supervisory Board: Prof. Dr. 
Wilhelm Bender 
Geschäftsführung / Executive Board: Michael Clausecker 
(Vorsitzender/Chairman), Dr. Susanne Kortendick, David Barry, Matthias 
Keller 
Sitz der Gesellschaft / Principal Office: Berlin 
Registergericht / Registration Court: Amtsgericht Charlottenburg, HRB 
64838 

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