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Bug 880567 - sys-fs/multipath-tools-0.9.3 fails tests (LTO-SYSTEM): string_fortified.h:59:10: error: [-Werror=stringop-overflow=]
Summary: sys-fs/multipath-tools-0.9.3 fails tests (LTO-SYSTEM): string_fortified.h:59:...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo's Team for Core System packages
Depends on:
Blocks: lto
  Show dependency tree
Reported: 2022-11-09 07:58 UTC by Agostino Sarubbo
Modified: 2024-03-17 06:00 UTC (History)
0 users

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

build.log (build.log,244.74 KB, text/plain)
2022-11-09 07:58 UTC, Agostino Sarubbo

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Description Agostino Sarubbo gentoo-dev 2022-11-09 07:58:13 UTC

Issue: sys-fs/multipath-tools-0.9.3 fails tests (LTO-SYSTEM).
Discovered on: amd64 (internal ref: lto_tinderbox)

(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:

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.

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

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

- 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:
Comment 1 Agostino Sarubbo gentoo-dev 2022-11-09 07:58:16 UTC
Created attachment 829943 [details]

build log and emerge --info
Comment 2 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2024-03-17 05:49:41 UTC
commit 1bb1ddae1e788f78eb2f7dd47f2f2f92e5fc7a94
Author: David Seifert <>
Date:   Thu Mar 23 16:54:48 2023 +0100

    sys-fs/multipath-tools: remove -Werror from build

    Signed-off-by: David Seifert <>
Comment 3 Larry the Git Cow gentoo-dev 2024-03-17 06:00:51 UTC
The bug has been referenced in the following commit(s):

commit b711a7a20e8b85a794d9d706cd1a76d4e4401b45
Author:     Sam James <>
AuthorDate: 2024-03-17 05:52:59 +0000
Commit:     Sam James <>
CommitDate: 2024-03-17 05:52:59 +0000

    sys-fs/multipath-tools: filter LTO
    It uses -Wl,--wrap and wrap_*. openSUSE filter LTO too.
    Signed-off-by: Sam James <>

 sys-fs/multipath-tools/multipath-tools-0.9.7-r1.ebuild | 2 ++
 sys-fs/multipath-tools/multipath-tools-0.9.7.ebuild    | 2 ++
 2 files changed, 4 insertions(+)