I made a workaround by installing the required packages for ppc64el via .gitlab-ci.yml I will post the patch with big endian support for the optimized functions.

Hello Niels,

On Tue, Jun 23, 2020 at 09:50:20AM +0200, Niels Möller wrote:

...

I investigated this issue. The Debian image used for Gitlab CI only supports the following archs amd64 mips armhf arm64. To add a new arch, this arch should be added to the sources list of apt and install the required packages to build and check nettle library.

Looks like the image is defined here: https://gitlab.com/gnutls/build-images/-/blob/master/docker-debian-cross/Doc...

Nikos, Michael, can we just add ppc64el to the ARCHES and TRIPLES lists there?

Sorry for the delay: In principile yes but as you've noticed already, the number of supported drop-in architectures is limited. I had additional unofficial architectures supported when developing the mechanism but it wasn't as straight-forward and prone to breakage. Therefore it did not make it upstream into GnuTLS's build-images.

If I understood the rest of the thread correctly, you've found a workaround using a cross-package, which seems a better way to go than fiddling with the unofficial architecture support, particularly if you do not want to or cannot change the build-images repo.

For reference: This GnuTLS .gitlab-ci.yml has ppc64le support from way back when: https://gitlab.com/michaelweiser/gnutls/-/blob/debian/.gitlab-ci.yml and here's the corresponding build-images Dockefile: https://gitlab.com/michaelweiser/build-images/-/blob/cross/docker-debian-cro.... It seems, I had ppc64le in there and without much hassle as well. YMMV.