On Fri Jun 26, 2026 at 4:57 PM CEST, Alexander Kanavin wrote:
> On Fri, 26 Jun 2026 at 13:38, Yoann Congal <[email protected]> wrote:
>> I've hacked the backport until it passes testing:
>> https://autobuilder.yoctoproject.org/valkyrie/?#/builders/29/builds/4085
>> ... but I'm really *NOT* sure this is the right approach. Hence this RFC
>> with the patches I ended-up with.
>>
>> If anyone could check/review/improve these patches to help me get them
>> to a mergable state, that'd be nice. Otherwise, I would have no other
>> choice than never support Ubuntu 26.04 on Scarthgap.
>
> I had a quick look, and they're basically ok.
>
> The key check is to run ldd on the rust-native pieces and confirm that
> they indeed start linking libLLVM*so dynamically after the patches (if
> it comes from rust-llvm, it's probably named differently). E.g. on my
> master build:
>
> alex@Zen2:/srv/storage/alex/yocto/build-64-alt$ ldd
> tmp/sysroots-components/x86_64/rust-native/usr/lib/librustc_driver-5e2c75e9f7705310.so
> linux-vdso.so.1 (0x00007f8f929d0000)
> libLLVM.so.22.1 => not found
> libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
> (0x00007f8f8ca00000)
>
> alex@Zen2:/srv/storage/alex/yocto/build-64-alt$ ldd
> tmp/sysroots-components/x86_64/rust-native/usr/bin/rustc
> linux-vdso.so.1 (0x00007f3eee009000)
> librustc_driver-5e2c75e9f7705310.so =>
> /srv/storage/alex/yocto/build-64-alt/tmp/sysroots-components/x86_64/rust-native/usr/bin/../lib/librustc_driver-5e2c75e9f7705310.so
> (0x00007f3ee8400000)
> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3ee820c000)
> libLLVM.so.22.1 => not found
> libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
> (0x00007f3ee7e00000)
Ok! So that looks good, because with the patches I get:
$ ldd tmp/sysroots-components/x86_64/rust-native/usr/bin/rustc
linux-vdso.so.1 (0x00007ffc06548000)
librustc_driver-686d20105d1a2cf7.so =>
$BUILD/tmp/sysroots-components/x86_64/rust-native/usr/bin/../lib/librustc_driver-686d20105d1a2cf7.so
(0x00007fcec0a00000)
libstd-64729a5a222c378b.so =>
$BUILD/tmp/sysroots-components/x86_64/rust-native/usr/bin/../lib/libstd-64729a5a222c378b.so
(0x00007fcec08c0000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcec06de000)
libLLVM-17.so => not found
libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
(0x00007fcec0400000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007fcec4d63000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fcec0320000)
$BUILD/tmp/sysroots-uninative/x86_64-linux/lib/ld-linux-x86-64.so.2 =>
/lib64/ld-linux-x86-64.so.2 (0x00007fcec4d98000)
And even: $ oe-run-native rust-native /bin/ldd
$BUILD/tmp/work/x86_64-linux/rust-native/1.75.0/recipe-sysroot-native/usr/bin/rustc
Getting sysroot...
linux-vdso.so.1 (0x00007ffd807b1000)
librustc_driver-686d20105d1a2cf7.so =>
$BUILD/tmp/work/x86_64-linux/rust-native/1.75.0/recipe-sysroot-native/usr/bin/../lib/librustc_driver-686d20105d1a2cf7.so
(0x00007f9ab0800000)
libstd-64729a5a222c378b.so =>
$BUILD/tmp/work/x86_64-linux/rust-native/1.75.0/recipe-sysroot-native/usr/bin/../lib/libstd-64729a5a222c378b.so
(0x00007f9ab06c0000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9ab04de000)
libLLVM-17.so =>
$BUILD/tmp/work/x86_64-linux/rust-native/1.75.0/recipe-sysroot-native/usr/bin/../lib/./libLLVM-17.so
(0x00007f9aab000000)
libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6
(0x00007f9aaac00000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
(0x00007f9ab04be000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f9ab03de000)
$BUILD/tmp/sysroots-uninative/x86_64-linux/lib/ld-linux-x86-64.so.2 =>
/lib64/ld-linux-x86-64.so.2 (0x00007f9ab4ae2000)
=> It does, in fact, dynamically link on the built libLLVM-17.so.
Thanks!
>
> Alex
--
Yoann Congal
Smile ECS
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