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

Bill Deegan bill at baddogconsulting.com
Thu Jan 30 00:26:02 EST 2020 

SCons doesn't only look for files when your SConstruct/SConscript file is
run (excluding calls go Glob() though even that call can see files which
aren't on disk but which SCons expects to produce). All those files do is
tell SCons what to do. After that SCons will run with those rules.

BTW. SCons will recognize "/" as a dirsep for any File()  you specify.

There's nothing I can do with just that SConscript to try to reproduce.
You'll have to simplify it  down to a single SConstruct and a few files
before I can take a look at it.



On Wed, Jan 29, 2020 at 6:22 PM Pierre-Luc Boily <pierreluc.boily at gmail.com>
wrote:

> I tried to simplify much as possible my sconscript(
> https://pastebin.com/yhE0FwAN).  But Java builder is still not creating
> the target under correct folder.
>
> I added taskmastertrace argument :
> 1- First build (java file doesn't exist)( https://pastebin.com/P5X24KrK)
> I can see my .class file is created directly under "classes" folder,
> instead of under "classes/adacel/speech" :
> <https://pastebin.com/P5X24KrK>
>
> 2- Second build (java file exists)(https://pastebin.com/6zByD2dy)
> I can see that .class file has to be build again
>
> See this picture (
> https://www.dropbox.com/s/vg0cifs50i9jxqz/sconsjava.png?dl=0)  .  As you
> can see, class file is created under classes\adacel\speech.  Log files
> above tell me that scons think that the .class file shall be under
> "classes" folder
>
> Sorry if I look dumb, but I don't understand how Java builder could create
> target "classes\adacel\speech\file.class" in the first build, because
> file.java doesn't exist yet :(  From my limited understanding, scons
> creates "classes\file.class" because it is the best he can do.
>
> Le mer. 29 janv. 2020, à 18 h 41, Bill Deegan <bill at baddogconsulting.com>
> a écrit :
>
>> run with --taskmastertrace=trace.log and take a look in there.
>>
>> On Wed, Jan 29, 2020 at 3:19 PM Bill Deegan <bill at baddogconsulting.com>
>> wrote:
>>
>>> 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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