This bug was fixed in the package protobuf - 3.21.12-11ubuntu3
---------------
protobuf (3.21.12-11ubuntu3) questing; urgency=medium
* Fix FTBFS on architectures which cannot optimize tail-calls
(LP: #2122479)
-- Valentin Haudiquet <[email protected]> Tue, 09 Sep
2025 18:05:00 +0200
** Changed in: protobuf (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2122479
Title:
protobuf is FTBFS on questing-proposed for i386 and s390x
architectures
Status in protobuf package in Ubuntu:
Fix Released
Bug description:
On i386 and s390x architectures, the compiler cannot optimize tail-
calls, but is forced by the MUSTTAIL directive.
> google/protobuf/generated_message_tctable_lite.cc:1666:46: error: cannot
tail-call: target is not able to optimize the call into a sibling call
1666 | PROTOBUF_MUSTTAIL return MpRepeatedString(PROTOBUF_TC_PARAM_PASS);
| ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
This results in a bug where compilation fail on such architectures.
This bug is already fixed upstream:
https://github.com/protocolbuffers/protobuf/issues/22367
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