Sven Hartrumpf <hartru...@gmx.net> writes: > Hello. > >> Sven Hartrumpf writes: >> >>> Hello. >>> >>> I want to cross-compile some packages for the x32 ABI >>> (because it can speed up one of my performance-critical applications). >>> Thanks to Efraim’s recent changes, I can simply use >>> >>> # guix build lz4 –target=x86_64-linux-gnux32 >>> (lz4 is only a simple example, not the one which is important for me :-) >>> >>> What is a good or simple way to use the resulting binaries >>> (which I find under /gnu/store/…/bin/lz4)? >>> My user-land binaries are mainly x86_64-linux-gnu, only few will be >>> x86_64-linux-gnux32. >>> >>> Greetings >>> Sven > > Csepp wrote, 2024-01-26: > >> Don’t they run as normal? > > They do. > I was looking for a way to prefer some x32 binaries over the 64bit ones. > >> If the question is about installing them in a profile, you could put them >> in a manifest. Or you could try grafting them into existing packages if you >> want them to use them in scripts. But be careful that you don’t mix >> libraries into that. > > For many packages, I will have two builds in /gnu/store , e.g. > > # file /gnu/store/*zstd*/bin/zstd > /gnu/store/p61ifh74s4n4jg7c1j1f2gw2c235lna0-zstd-1.5.5/bin/zstd: ELF 64-bit > LSB > executable, x86-64, version 1 (SYSV), dynamically linked, interpreter > /gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/ld-linux-x86-64.so.2, > for GNU/Linux 2.6.32, stripped > /gnu/store/yf15abzz51wfapi699g1xp02lklkis5z-zstd-1.5.5/bin/zstd: ELF 32-bit > LSB > executable, x86-64, version 1 (SYSV), dynamically linked, interpreter > /gnu/store/dxxbn44p9lfy7pbpj82kj68rk2mixn89-glibc-cross-x86_64-linux-gnux32-2.35/lib/ld-linux-x32.so.2, > for GNU/Linux 2.6.32, stripped > >> But as far as using them goes, I’m pretty sure you can just run them. Guix >> is actually really nice for this use case, because you don’t have to >> manually manage a different sysroot for every ABI. I’ve used this property >> at work to cross-build an ARM package and transfer it to a Raspberry Pi. It >> just worked. > > Yes. > But thhe use of –target for building x32 binaries is somewhat different from > cross-compilation > because the resulting binaries can (and should) be run on the host system. > And of course, > a profile can only referenced one version and that will be the 64bit version. > > I came up with a naive solution which works for me (as a Guix System > beginner). > I explicitly put links in ~/.local/bin/x86_64-linux-gnux32/ to the x32 > binaries I prefer. > (~/.local/bin/x86_64-linux-gnux32/ is the first element in my PATH). > > Greetings > Sven
I recommend looking into package transformations (especially how grafts work) and/or managing multiple profiles. If you want to have the x32 variants in your profile, I think you can do that with a manual graft.
