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

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

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 Make sure that scons builds all out-of-date targets defined by a single 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
 
  
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