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Re: Trying to crosscompile for POWER9
From: |
Chris Marusich |
Subject: |
Re: Trying to crosscompile for POWER9 |
Date: |
Tue, 30 Oct 2018 20:02:07 -0700 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Hi Tobias!
Thank you for trying things out for POWER9! I'm also interested in this
platform, although I have to admit I don't own any hardware (yet!) and
haven't tried it out. I've only read about it so far.
Tobias Platen <address@hidden> writes:
> On 10/22/2018 06:39 PM, Leo Famulari wrote:
>> On Sun, Oct 21, 2018 at 08:30:03AM +0200, Tobias Platen wrote:
>>> On 10/20/2018 09:09 PM, Tobias Platen wrote:
>>> Here are the build logs from guix. I have tried building the toolchain
>>> twice, but in both cases glibc failed to build.
>>
>> [...]
>>
>>> running configure fragment for sysdeps/powerpc/powerpc64/le
>>> checking if powerpc64le-linux-gcc supports binary128 floating point
>>> type... no
>>> checking if the target machine is at least POWER8... yes
>>> configure: error: *** binary128 floating point type (GCC >= 6.2) is
>>> required on powerpc64le.
>>
>> Searching around, I found other distros hit the same problem for their
>> POWER ports, and needed to explicitly configure GCC >= 6.2 to build with
>> 128-bit floating point types. Specifically, with the option
>> '--with-long-double-128':
>>
>> https://github.com/advancetoolchain/advance-toolchain/commit/e22696eecb39c6b401df14001f01608807e4d934
>> http://lists.busybox.net/pipermail/buildroot/2017-August/200952.html
>>
>> I hope that helps!
>>
> I modified the file "gnu/packages/cross-base.scm" and the cross gcc
> still does not support 128-bit floating point types. How do I trigger
> a rebuild of the cross compiler so I can verify that it is configured
> correctly.
You can try to cross-build something as usual, I suppose. It's a bit
heavy-handed, since it will try to build the entire cross-compilation
toolchain also, but it might work.
To see if you can build *just* the cross-compiler, you might need to get
tricky. For example, you might need to break out a Guile REPL, load
some Guix modules, and manually hack around with some of the code in
gnu/packages/cross-base.scm. In theory, you ought to be able to create
a package or a derivation that builds the cross-compiler you are using,
or a cross-compiler that is similar to it.
That's all the advice I can think of right now. You're not alone - I've
fumbled around quite a bit while learning how Guix does its
cross-compilation and bootstrapping. It's not easy going, but hopefully
you will be able to find a way forward. Good luck!
--
Chris
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- Trying to crosscompile for POWER9, Tobias Platen, 2018/10/16
- Re: Trying to crosscompile for POWER9, Efraim Flashner, 2018/10/16
- Re: Trying to crosscompile for POWER9, Tobias Platen, 2018/10/20
- Re: Trying to crosscompile for POWER9, Efraim Flashner, 2018/10/20
- Re: Trying to crosscompile for POWER9, Tobias Platen, 2018/10/20
- Re: Trying to crosscompile for POWER9, Tobias Platen, 2018/10/22
- Re: Trying to crosscompile for POWER9, Leo Famulari, 2018/10/22
- Re: Trying to crosscompile for POWER9, Tobias Platen, 2018/10/28
- Re: Trying to crosscompile for POWER9,
Chris Marusich <=
- Re: Trying to crosscompile for POWER9, Tobias Platen, 2018/10/28
Re: Trying to crosscompile for POWER9, Jonathan Brielmaier, 2018/10/16
Re: Trying to crosscompile for POWER9, Ludovic Courtès, 2018/10/19