[Scons-users] Java builder is rebuilds when not needed

[Bill Deegan]

yacc creates c which get's compiled to o's.
SCons knows when a target is built (or not yet built) and won't scan the
file if it's not there.
If it's rebuilt. SCons knows to scan the file again.

Assuming you have a correct list of files produced by the idl (emitter
and/or manually specified targets), it should do the right thing.

-Bill

On Wed, Jan 29, 2020 at 2:12 PM Pierre-Luc Boily <pierreluc.boily at gmail.com>
wrote:

> So, how Java builder can create the targets when java files are not yet
> existing?
>
> this
> classes_tgt = env.Java(target='classes',
>                        source=java_files_to_be_generated_from_idl)
>
> Can`t create correctly classes_tgt because java files are not yet created
> from idl.  Is it possible without creating a custom builder?
>
> Le mer. 29 janv. 2020, à 16 h 12, Bill Deegan <bill at baddogconsulting.com>
> a écrit :
>
>> When a file is built, then it would get scanned.
>> So likely that's not the case.
>>
>> On Wed, Jan 29, 2020 at 10:17 AM Pierre-Luc Boily <
>> pierreluc.boily at gmail.com> wrote:
>>
>>> I think I know what the problem is.  At the first scons pass, java files
>>> that are generated from idl into the variant dir don't exist yet.  So,
>>> scons can`t scan the java file for "package" statement.  That is why the
>>> target is
>>>
>>> classes/fileName.class
>>> instead of
>>> classes/adacel/speech/fileName.class
>>>
>>> For this understandable reason, I don't have the choice to create my own
>>> builder around the Java builder.  This builder will take care of creating
>>> java from idl and create the correct targets in the emitter.
>>>
>>> Le mer. 29 janv. 2020, à 11 h 32, Pierre-Luc Boily <
>>> pierreluc.boily at gmail.com> a écrit :
>>>
>>>> Hello,
>>>>
>>>> I have a case where
>>>> 1- I am creating java files from idl then
>>>> 2- Compile those java files
>>>>
>>>> All my java files starts with "package adacel.speech;"
>>>>
>>>> --------------------------------
>>>> generated_java_target += env.Command(
>>>>                                      target='ActivateGrammar.java',
>>>>
>>>> source='#sr/speech/common_dds/ActivateGrammar.idl',
>>>>                                      action=[idl_command])
>>>>
>>>> classes_tgt = env.Java(target='classes',
>>>>                        source=generated_java_target)
>>>> ---------------------------------
>>>>
>>>> The code above generates all my class files under
>>>> "classes/adacel/speech",
>>>> which is correct.
>>>>
>>>> But when I start another build with following code :
>>>> for i in classes_tgt:
>>>>     print(str(i))
>>>>
>>>> I can see that all my class targets looks like this :
>>>> classes\ActivateGrammar.class
>>>>
>>>> Which is incorrect.  scons tell me :
>>>> scons: building
>>>>
>>>> `build\sr\speech\ContextualPostProcessor\RulesEngine\DroolsGenericModel\classes\TimeValueHolder.class'
>>>> because it doesn't exist
>>>>
>>>> Scons should look under classes\adacel\speech
>>>>
>>>> Am I doing something incorrect?  Is this a bug in Java builder?  As a
>>>> workaround, I though doing my own builder that takes idl that generates
>>>> java
>>>> file and build it.  And within the emitter, generate all class targets
>>>> that
>>>> points to correct path.  It could be faster, because in that case, I
>>>> could
>>>> generate all java files and compile them at once.
>>>>
>>>>
>>>>
>>>> --
>>>> Sent from: http://scons.1086193.n5.nabble.com/Users-f16930.html
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