Re: [meta-virtualization] [PATCH] lxc: restore DEBUG_PREFIX_MAP in TARGET_LDFLAGS for LTO reproducibility

This is now merged, along with the LTS feature work I was doing.

Anyone else reading this, package upgrades and pending patches will land
shortly as well.

Bruce

On Wed, Feb 4, 2026 at 8:40 PM Bruce Ashfield via lists.yoctoproject.org
<[email protected]> wrote:

> Thanks Ricardo,
>
> I've been following the OECore discussions on LTO and the prefix maps.
>
> If I'm following correctly, we still need this.
>
> I'm just about to push my container-cross-install baseline, but will get
> to this
> in the next few days.
>
> Bruce
>
> On Thu, Jan 29, 2026 at 5:40 PM Ricardo Salveti via lists.yoctoproject.org
> <[email protected]> wrote:
>
>> oe-core [1] removed DEBUG_PREFIX_MAP from TARGET_LDFLAGS to avoid passing
>> prefix-map options via the linker flags. This is fine for most projects
>> since DEBUG_PREFIX_MAP is also provided via CFLAGS at configure time.
>>
>> However, lxc enables LTO by default, which causes link-time code
>> generation
>> to (re)emit debug information during the link step. Without
>> DEBUG_PREFIX_MAP
>> on the link command line, TMPDIR/WORKDIR paths can leak into DWARF,
>> triggering the buildpaths QA check and breaking reproducibility.
>>
>> Append DEBUG_PREFIX_MAP back to TARGET_LDFLAGS for lxc to ensure
>> prefix-map
>> options are visible during LTO link-time compilation.
>>
>> [1]
>>
>> https://git.openembedded.org/openembedded-core/commit/?id=1797741aad02b8bf429fac4b81e30cdda64b5448
>>
>> Signed-off-by: Ricardo Salveti <[email protected]>
>> ---
>>  recipes-containers/lxc/lxc_git.bb | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/recipes-containers/lxc/lxc_git.bb b/recipes-containers/lxc/
>> lxc_git.bb
>> index 542134db..04db2ac0 100644
>> --- a/recipes-containers/lxc/lxc_git.bb
>> +++ b/recipes-containers/lxc/lxc_git.bb
>> @@ -63,6 +63,9 @@ EXTRA_OEMESON += "${PTEST_CONF}
>> -Ddistrosysconfdir=${sysconfdir}/default"
>>  # No meson equivalent for these yet
>>  # EXTRA_OECONF += "--enable-log-src-basename --disable-werror"
>>
>> +# LTO is enabled by default, expose prefix-map options to the linker for
>> reproducibility
>> +TARGET_LDFLAGS:append = " ${DEBUG_PREFIX_MAP}"
>> +
>>  PACKAGECONFIG ??= "templates \
>>      ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'systemd', '',
>> d)} \
>>      ${@bb.utils.contains('DISTRO_FEATURES', 'selinux', 'selinux', '',
>> d)} \
>> --
>> 2.34.1
>>
>>
>>
>>
>>
>
> --
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> at its end
> - "Use the force Harry" - Gandalf, Star Trek II
>
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-- 
- Thou shalt not follow the NULL pointer, for chaos and madness await thee
at its end
- "Use the force Harry" - Gandalf, Star Trek II