Building for mips

[David Holmes]

Hi Daniel,

Just to confirm, 8u pre-dates the jdk-updates project so yes you would 
clone:

http://hg.openjdk.java.net/jdk8u/jdk8u/

to get latest OpenJDK 8u.

David

On 27/03/2019 11:23 am, Daniel Santos wrote:
> Hello David,
> 
> Sorry for my slow response and thanks for your help.
> 
> I don't
> 
> On 3/25/19 6:48 AM, David Holmes wrote:
>> Hi Daniel,
>>
>> The Portola project started from JDK 10 so you won't find any musl
>> patches for JDK 8.
> 
> That helps explain the lack of any changes needed for musl. :)  Also, I
> now realize that these were old tags from the mainline.  Is there any
> way I can easily pull a portola build based upon a given upstream tag?
> (e.g, jdk9u123 or some such).
> 
>>
>> There is no current working MIPS port for OpenJDK - yes there was back
>> in JDK 7. There was talk of it reviving for 8 but that hasn't happened
>> as yet:
>>
> 
> Oh, I didn't realize there was a working MIPS for JDK7.  Was this via
> Zero or did it actually have the C1 and C2 compilers?  The Loongnix
> project has a working JDK8 for mips64, but it has been privately
> developed for 8 years and they appear to have a lot of work to do to
> prepare it for being main lined, while also maintaining issues for their
> user base.  I'm hopeful that once that's update it will be more feasible
> for a mipsel (32-bit) port, but for now I'm just looking at using Zero.
> 
>> https://mail.openjdk.java.net/pipermail/mips-port/2018-August/000087.html
>>
> 
> oh, whoops lol!  Yeah, you already know about that. :)
> 
>> So you would be trying to either bring an old MIPS port into the
>> Portola repo (massive task, not recommended). Or else you need to
>> start with the OpenJDK 7 MIPS port and then try to apply the musl
>> changes to that by looking at the changesets that have been applied to
>> the portola repo. That's also not a small job and the differences
>> between JDK 7 and JDK 10+ code are huge.
>>
> 
> Well I had cloned portola/portola and checkoued out the jdk8-b120 tag
> and started working from there -- it turns out it's very old.  So I'm in
> the process of importing jdk/jdk into git (as I know how to get around
> in git) and when that's done I was planning on rebasing my patches onto
> the latest jdk8u tag.  Luckily, Debian has some mipsel patches for jdk8
> that work, Alpine has musl patches and I've done a lot of the changes
> myself already, so I'm just going to go through them all and try to
> merge them (plucking out things that I don't need).
> 
>> Mikael Vidstedt did the musl work in portola so he may be able to give
>> you some specific pointers when he's available.
>>
>> You may be able to build a Zero interpreter version of Portola for
>> MIPS - you'd need to ask the Zero folk about that.
>>
>> With regards to general repo structure ... there are lots of OpenJDK
>> repos. jdk/jdk is the mainline repo currently targeting JDK 13.
>>
>> http://hg.openjdk.java.net/jdk/jdk/
>>
>> You'll find tags in there for earlier versions but no branches as we
>> don't use those in the mainline repo. There are independent repos for
>> the various OpenJDK update versions: 8u, 11u, 12u.
>>
>> http://hg.openjdk.java.net/jdk-updates
> 
> So if I want to start from the latest stable update for a given major
> version, jdk8 in this instance, should I clone
> http://hg.openjdk.java.net/jdk-updates/jdkX-u (with X being the major
> version number)?  I'm not seeing jdk8-u in there, so should I get that
> from jdk/jdk via tag or should I clone the jdk8u/jdk8u forest (i.e.,
> http://hg.openjdk.java.net/jdk8u/jdk8u/)?
> 
>>
>> Then there are various project specific repos, like portola (e.g.
>> valhalla, panama) that have their own particulars that you'd need to
>> check with the individual projects.
>>
>> HTH
>>
>> David
> 
> Thanks again for your help!  Hopefully when I get a clean, working build
> I can see about mainlining some of these changes, especially for mips
> support (at least mipsel)
> 
> Daniel
>