Re: [Boost-build] jar files

From: Phillip Seaver (phil_at_[hidden])
Date: 2006-09-25 12:45:04

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.  So, I think I need my own javac generator 
that "knows" where the output files end up.  As I understand it, I'll 
need to override the "run" method to accomplish this.  I'll then need to 
make the .class filenames I pass to the jar command relative to the .jar 
file.

Here's what I have in my class's run method:

        rule run ( project name ? : property-set : sources * )
        {
                local s = $(sources[1]) ;
                local a = [ new action $(s) : java.javac : 
$(property-set) ] ;
                name ?= [ $(s).name ] ;
                local sp = [ $(s).project ] ;
                local source-root = [ $(sp).get source-location ] ;
                source-root = [ path.root $(source-root) [ path.pwd ] ] ;
                local d = $(s).path ;
                d = [ path.root $(name:D) $(d) ] ;
                d = [ path.root $(d) [ path.pwd ] ] ;
                local relative = [ path.relative-to $(source-root) $(d) ] ;
                local targets = [ new file-target $(name:D=$(relative)) 
: CLASS : $(project) : $(a) ] ;
                return $(targets) ;
        }

Am I on the right track?  Or do I need to go somewhere else and start 
again?  :-)

Thanks,

Phillip