Re: [Boost-build] jar files

From: Phillip Seaver (phil_at_[hidden])
Date: 2006-09-25 14:57:08

Vladimir Prus wrote, on 9/25/2006 1:56 PM:
> On Monday 25 September 2006 20:45, Phillip Seaver wrote:
>   
>> Vladimir Prus wrote, on 9/22/2006 1:50 AM:
>>     
>>> On Friday 22 September 2006 01:05, Phillip Seaver wrote:
>>>       
>>>> Has anyone used boost-build to create jar files?  One of my co-workers
>>>> is compiling .java files into .class files and then making a .jar file
>>>> out of the .class files.  The problem is the paths in the class files.
>>>> He basically needs to strip off everything but the original relative
>>>> path.  E.g., for apago/foo.java, he gets
>>>> ....../link-static/threading-multi/apago/foo.class and he needs to pass
>>>> just apago/foo.class to the jar creation program.
>>>>         
>>> Isn't this the matter for passing right -C options to jar? Of course,
>>> computing the right options might not be straight-forward. Or maybe not
>>> -- would
>>>
>>>     jar
>>>    -C ..../link-static/threading-multi
>>>    <all .class file>
>>>
>>> work?
>>>
>>> - Volodya
>>>       
>> Not quite.  javac creates filenames relative to the source directory, so
>> for ./apago/foo.java, "javac -d {build-dir}" creates
>> {build-dir}/apago/foo.class.  
>>     
>
> Ah, I read your original email as saying you've some problem with jar, like 
> having extra directories in path. 
>   

With the way things are currently being done, the jar action gets passed 
.class names without the directory structure that javac creates, so 
that's a problem too.

>> So, I think I need my own javac generator 
>> that "knows" where the output files end up.  
>>     
>
> So, you want to give javac a directory full of java files, have it 
> create .class files in builddir.
>   

Actually, we pass javac a single .java at a time.

>> Am I on the right track?  Or do I need to go somewhere else and start
>> again?  :-)
>>     
>
> I'm afraid so. A single .java file can result in multiple .class files being 
> produced. One language feature that I know does this is 'anonymous classes'. 
> I think the if you have several classes in one .java file you'll get 
> several .class files too, but this case might be handled by regexp, while 
> detecting anonymous classes is harder.
>   

True.  You can have multiple classes in a .java file, including inner 
classes, each of which results in a .java file.  I didn't know that 
before you brought it up.  (I'm not a java programmer :-) ).

> SCons is supposed to have a parser that works,  which I attach. It seems to be 
> standlone, so you probably can call it when using Python-enabled bjam.
>   

You seem to have forgotten to attach it.  :->  How do I get a 
python-enabled bjam?

> Even then, I think the right interface would be to specify a source directory, 
> not a single .java file. I think that compiling a single .java file might not 
> work, since other classes the compiled file depends on might not be compiled 
> yet. I'm not sure about this though.
>
> -  Volodya

I think it would need to do dependency scanning, too.  On the other 
hand, if all I'm ever doing with the .class files is putting them in a 
.jar file, the javac command could be part of the jar actions...

Thanks,

Phillip