Small change triggers 8990 file compiling?

[Weijun Wang]

On 10/12/2012 03:33 PM, Alan Bateman wrote:
> On 12/10/2012 03:57, Weijun Wang wrote:
>> Hi All
>>
>> I'm using the new build on a Ubuntu 12.04 64 bit. Configure runs ok,
>> and make runs ok. Now I have a good build output directory. Running
>> make again costs no time at all.
>>
>> Then I qpush a mq patch, which only touches 30 or so files deep inside
>> src/share/classes/com/sun/security and src/share/classes/sun/security
>> of the jdk repo, and running make shows
>>
>>    Compiling 8990 files for BUILD_JDK
>>
>> and a while bunch of other c files which costs 00:01:20.
>>
>> Is that an expected behavior?
> My experience with the new build is that it is really fast for doing the
> initial build, really fast at doing incremental builds after touching
> native code, but not so fast when touching java classes. Those of us
> used to the old build system know the make files to run and are used to
> incremental builds that take only a few seconds. I realize this isn't
> really a fair comparison as the old build system doesn't track
> dependencies and is very unreliable.
>
> You might want to --enable-sjavac which is the "smart javac". I saw a
> mail from Magnus recently that said this isn't enabled by default as
> it's not completely stable yet. It's been working well for me and I see
> a bunch of changes going in from Fredrik that suggests to me that it is
> improving by the day. Anyway, from trying sjavac is that it seems to get
> us into the right ballpark.

It seems sjavac in only in build-infra. I'll try it later.

Thanks
Max

>
> -Alan