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Bug 880197 - sys-cluster/ceph-18.2.0-r2 one or more CMake variables were not used by the project
Summary: sys-cluster/ceph-18.2.0-r2 one or more CMake variables were not used by the p...
Status: CONFIRMED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Patrick McLean
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-11-07 11:17 UTC by Agostino Sarubbo
Modified: 2023-09-14 06:49 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


Attachments
build.log.xz (build.log.xz,115.95 KB, application/x-xz)
2022-11-07 11:17 UTC, Agostino Sarubbo
Details

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Description Agostino Sarubbo gentoo-dev 2022-11-07 11:17:07 UTC
https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: sys-cluster/ceph-17.2.5-r1 one or more CMake variables were not used by the project.
Discovered on: amd64 (internal ref: lto_tinderbox)

NOTE:
(LTO-SYSTEM) in the summary means that bug was found on a machine that runs lto but this bug MAY or MAY NOT BE related to lto.

This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

Here is a bit of explanation:

-Werror=lto-type-mismatch:
User to find possible runtime issues in packages. It likely means the package is unsafe to build & use with LTO.
For projects using the same identifier but with different types across different files, they must be fixed to be consistent across the codebase.

-Werror=odr:
Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO. C++ code must comply with the One Definition Rule (ODR) - see https://en.cppreference.com/w/cpp/language/definition#One_Definition_Rule.

-Werror=strict-aliasing:
Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO.

Workarounds:
- If upstream is friendly and still active, file a bug upstream. For emulators, codecs, games, or multimedia packages, it may be worth just applying a workaround instead, as upstreams sometimes aren't receptive to these bugs (VALID FOR ALL).
- Use the new 'filter-lto' from flag-o-matic.eclass as it's likely to be unsafe with LTO (VALID FOR lto-type-mismatch - odr).
- Fix it yourself if interested, of course (VALID FOR ALL).
- Append-flags -fno-strict-aliasing (VALID FOR strict-aliasing).
- Use memcpy() but a union is sometimes suitable too (VALID FOR strict-aliasing).
- -fstrict-aliasing is implied by -O2, so this must be addressed in some form (VALID FOR strict-aliasing).

See also: https://marc.info/?l=gentoo-dev&m=165639574126280&w=2
Comment 1 Agostino Sarubbo gentoo-dev 2022-11-07 11:17:11 UTC
Created attachment 828385 [details]
build.log.xz

build log and emerge --info (compressed because it exceeds attachment limit, use 'xzless' to read it)
Comment 2 Agostino Sarubbo gentoo-dev 2022-12-30 12:15:35 UTC
ci has reproduced this issue with version 17.2.5-r2 - Updating summary.
Comment 3 Agostino Sarubbo gentoo-dev 2023-01-13 09:21:01 UTC
ci has reproduced this issue with version 17.2.5-r3 - Updating summary.
Comment 4 Agostino Sarubbo gentoo-dev 2023-04-12 07:25:14 UTC
ci has reproduced this issue with version 17.2.6 - Updating summary.
Comment 5 Patrick McLean gentoo-dev 2023-04-12 18:20:08 UTC
This isn't really fixable. The variable CMAKE_INSTALL_LIBDIR is set by the eclass, but the upstream Ceph build system does not use it for anything, and this warning gets generated.

This warning isn't a problem in practice (it's just there to help catch USE flags that don't do anything any more).
Comment 6 Agostino Sarubbo gentoo-dev 2023-05-10 06:59:16 UTC
ci has reproduced this issue with version 17.2.6-r2 - Updating summary.
Comment 7 Agostino Sarubbo gentoo-dev 2023-09-12 06:49:13 UTC
ci has reproduced this issue with version 18.2.0-r1 - Updating summary.
Comment 8 Agostino Sarubbo gentoo-dev 2023-09-14 06:49:29 UTC
ci has reproduced this issue with version 18.2.0-r2 - Updating summary.