Javac works with what you give it.
If there are dependencies between datasets, then they will not build;
otherwise, they will compile just fine. There are optimization concerns
though and here are some cases:
Java('build',
[source1, source2],
JAVASOURCEPATH='src')
Note: keep in mind that the javac call will multithread automatically;
I don't know if it default to 2 threads or to physical_core_count, but
there is some auto-optimization here.
Case 1:
source1 = [ 1.java, 2.java, #.java ]
source2 = [ a.java, b.java, n.java ]
This is probably fine since you are optimizing the compilation by
splitting of build trees.
Case 2:
source1 = 1.java
source2 = 2.java
sourceN = N.java
This is bad; there is a lot of overhead. Java builds are not
synonomous to c-like compiles.
Case 3:
source1 = dir1
source2 = dir2
This is essentially equivalent to case 1 and is fine.
---
Long story short, the sources should probably be flattened, but there
is also a performance issue with SCons java toolset atm which chokes
on Java( ... ) calls with a large number of source inputs. Dirk and I
have been discussing this on BitBucket and allowing for splitting of
files like this may be useful currently.
V/R,
William
On Sat, Jul 12, 2014 at 10:31 AM, Gary Oberbrunner <ga...@oberbrunner.com>
wrote:
>
>
>
> On Sat, Jul 12, 2014 at 10:22 AM, William Blevins <wblevins...@gmail.com>
> wrote:
>
>>
>> 2432 definitely duplicates 1772. The only difference is that 2432
>> proposes a (bad) solution to the problem.
>>
>> Both give the example:
>>
>> Java('build',
>> [source1, source2],
>> JAVASOURCEPATH='src')
>>
>> And explain that "their" issue is that source1 and source2 build in parallel
>> with separate javac commands; this is easily fixable with a FLATTEN call,
>> but we still haven't asked the important question. Is this working as
>> designed and the documentation needs to be updated to reflect or is this a
>> software failure?
>>
>> I see what you mean now, William. I'm OK with marking as dup. As for
> your big question, again I'm not the right guy to say but my understanding
> is javac works much better when all the .java files are passed on the same
> invocation.
>
> --
> Gary
>
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>
>
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