crossdev build chain

eu47 · Posted: Sun Apr 30, 2023 3:05 pm Post subject: crossdev build chain

Trying to build the crossdev chain on amd64 for Raspberry Pi 4:

pingtoo · Posted: Sun Apr 30, 2023 3:39 pm Post subject:

You run into Introduction of app-alternatives ebuilds problem.

You can do after you finish step: "crossdev -P -v -t aarch64-unknown-linux-gnu --init-target -oO /var/db/repos/rpi"

Hu · Administrator Joined: 06 Mar 2007 Posts: 22655

eu47 · Posted: Sun Apr 30, 2023 4:58 pm Post subject: Still failing

After applying pingtoo's hint it still fails.

I did not find a way to attach the logs in the post, so I put shared them here:

https://drive.google.com/drive/folders/1ig1PO85yLz_PGuzz_hgtI7KMXBDZpfv-?usp=sharing

Hu · Administrator Joined: 06 Mar 2007 Posts: 22655

Logs can be pasted inline using [code] tags if they are short, or uploaded to a pastebin or other external service if they are long. Based on the Google Drive link you provided, you appear to have 5 log files. However, the page is not able to present them as copyable text, nor are any of them actual links, so I can only see how big they are. From your original report, I suspect we want the glibc log file, the exact name of which cannot be selected from the Google Drive page. I have seen Google fail before, but failing even to present selectable text is a new one for me.

pingtoo · Posted: Sun Apr 30, 2023 5:28 pm Post subject: Re: Still failing

eu47 · Posted: Sun Apr 30, 2023 5:51 pm Post subject: /var/db/repos/rpi

/var/db/repos/rpi is initially an empty directory.

At the end of this command:

eu47 · Posted: Sun Apr 30, 2023 6:02 pm Post subject: crossdev build chain

I should mention a few more things:

1. This started to happen a few months ago, probably around the time when app-alternatives concept was introduced.
2. I keep regular backups, so I have a (still) working crossdev chain based on gcc-12.2.0 and glibc-2.33-r14.
3. Each time I'm trying to update to a newer glibc version, the build fails. For example, I just updated to gcc-13 by using

pingtoo · Posted: Sun Apr 30, 2023 6:16 pm Post subject: Re: crossdev build chain

eu47 · Posted: Sun Apr 30, 2023 8:29 pm Post subject: Re: crossdev build chain

pingtoo · Posted: Sun Apr 30, 2023 9:17 pm Post subject:

eu47,

You really should try app-text/wgetpaste. Using google drive is pain.

Not sure why you want to use gcc-13. since it is not stable.

cross-gcc-stage2 is using first stage to build final gcc with all the front end tool. it also a verify that stage1 build is really useful. I guess in your case it prove it is not stable yet. so it is not good to use for cross compile.

eu47 · Posted: Sun Apr 30, 2023 9:27 pm Post subject:

I understand.
But even gcc-12 fails to build at stage 2 with glibc > 2.33.
I can't figure out if it's a gcc problem or glibc one.

Hu · Administrator Joined: 06 Mar 2007 Posts: 22655

If you still need help, please pastebin the complete build log. As I stated above, and as pingtoo alluded to recently, Google Drive is not a proper way to share files, because it cannot properly share files or even their names.

eu47 · Posted: Sun Apr 30, 2023 11:08 pm Post subject:

I'll give up for now and stick to crossdev with gcc-12 and glibc-2.33, which works well.

I tried a pastebin.com free account but it only allows for 512kB pastes and the full log has 2.7MB.

A few extracts related to errors are shown below:

Hu · Administrator Joined: 06 Mar 2007 Posts: 22655

None of that output shows any errors that we can use. At best, it confirms to us that pthreads cannot be used, but does not say why. See config.log for details.

eu47 · Posted: Mon May 01, 2023 1:28 am Post subject:

Wondering if I should report a bug on crossdev related to this.
Maybe the issue can be replicated by others who could find the problem.

axl · Veteran Joined: 11 Oct 2002 Posts: 1146 Location: Romania

eu47 · Posted: Mon May 01, 2023 7:03 am Post subject:

axl · Veteran Joined: 11 Oct 2002 Posts: 1146 Location: Romania

axl · Veteran Joined: 11 Oct 2002 Posts: 1146 Location: Romania

I use mine as such:

eu47 · Posted: Mon May 01, 2023 10:26 pm Post subject:

Interesting. You may have your reasons to have that third linux in /mnt/blanc/rootfs/pi.

I only need your second linux, that in /usr/aarch64-unknown-linux-gnu.
It is used with distcc to help with compilation on the stronger machine of ebuilds on the Raspberry Pi.
So, I do not need to build a full system with cross-emerge @world.

For now it works well with gcc-12.2.1 and glibc-2.36.
I was able to get here with:

Hu · Administrator Joined: 06 Mar 2007 Posts: 22655

The error messages in this thread seem to match [Crossdev] Pthreads are required to build libgomp at cross-gcc-stage2.

From reading the crossdev script, it looks like there are ways to preserve USE, but yes, it does tend to reset things when used, presumably because some cross-targets are so fragile that this was the only way to get them working. Once the cross build has succeeded far enough for you to use emerge cross-arch..., you can customize the USE flags, cease use of crossdev, and maintain the packages via emerge.

eu47 · Posted: Tue May 02, 2023 1:12 pm Post subject:

I have a complete --stage4 cross build.
/usr/aarch64-unknown-linux-gnu/etc/portage/make.conf has

axl · Veteran Joined: 11 Oct 2002 Posts: 1146 Location: Romania

eu47 · Posted: Wed May 03, 2023 7:06 am Post subject:

Thanks axl.
The error was setting -march=native, which was not recognized by aarch64-unknown-linux-gnu-gcc.