The scalac compiler understand java code and can perform mixed compilation
without specifying an order.
Basically, it goes in 3 phases if there are java files present
1) scalac compiler extract all java class/interface signatures
2) scalac compiler compiles all .scala files using extracted signatures
from #1
3) scalac compiler compiler all Java code (using compiled .scala classes
from #2)
so it doesn't matter if the Java code depends on Scala code or vice-versa.
On Tue, Jul 30, 2013 at 8:48 PM, Peter Donald wrote:
> Hi,
>
> I don't use the scala plugin so this may be wrong but looking at the
> source, it seems that the scala compilers are responsible for
> compiling the java dependencies as well as the scala code. It seems
> that the only reason that the scala plugin also runs the javac
> compiler is to pick up java files that are not transitive dependencies
> of the scala code. Or thats what it looks like to me ...
>
> On Thu, Jul 25, 2013 at 6:14 PM, Marius Kjeldahl
> wrote:
> > In the process of adding tests to my kawa module for buildr, I'm
> struggling
> > with build order. The scala module that I've modelled my kawa module on
> > seems to simply build the scala code first, then the java code for mixed
> > mode compilation. The code can be found in scala/compiler.rb in the
> method
> > compile_with_scalac.
> >
> > One of the tests that comes with the module then defines a java package
> > Foo, and a scala package Bar, where Bar inherits from Foo.
> >
> > When I model my own compile_with_kawac method similar to the scala
> method,
> > this test fails. The reason it fails is because the java module Foo
> hasn't
> > been compiled when the kawa module Bar is being compiled.
> >
> > At first I suspected there might be something wrong in my compile_map
> code,
> > but after looking at it, it seems that the method does not even try to
> > figure out build order at all, only mapping from source file to class
> file.
> >
> > So how is build order decided in buildr?
> >
> > For this one test I added a workaround where I retry kawa compilation if
> it
> > fails the first time, but considering that I'm doing everything in a
> > simliar way and order as the scala module, there's got to be something
> I'm
> > missing. Worst case, the scala compiler handles such dependencies itself.
> >
> > Anyway, figured I would ask, hoping somebody could clue me in.
> >
> > Thanks,
> >
> > Marius Kjeldahl
>
>
>
> --
> Cheers,
>
> Peter Donald
>
