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Bug 856091

Summary: dev-libs/rocr-runtime-5.7.1-r1 fails to compile (lto): si_gb_reg.h:91:3: error: type union GB_ADDR_CONFIG violates the C++ One Definition Rule [-Werror=odr]
Product: Gentoo Linux Reporter: Agostino Sarubbo <ago>
Component: Current packagesAssignee: Craig Andrews <candrews>
Status: RESOLVED FIXED    
Severity: normal CC: admnd, eschwartz93, gentoo
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
See Also: https://github.com/ROCm/ROCR-Runtime/issues/182
Whiteboard:
Package list:
Runtime testing required: ---
Bug Depends on:    
Bug Blocks: 618550    
Attachments: build.log

Description Agostino Sarubbo gentoo-dev 2022-07-03 07:39:12 UTC
https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: dev-libs/rocr-runtime-5.0.2 fails to compile (lto).
Discovered on: amd64 (internal ref: lto_tinderbox)

NOTE:
This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing
Comment 1 Agostino Sarubbo gentoo-dev 2022-07-03 07:39:15 UTC
Created attachment 789848 [details]
build.log

build log and emerge --info
Comment 2 Agostino Sarubbo gentoo-dev 2022-07-03 07:39:17 UTC
Error(s) that match a know pattern in addition to what has been reported in the summary:


FAILED: libhsa-runtime64.so.1.5.0 
fatal: not a git repository (or any parent up to mount point /var/tmp)
/var/tmp/portage/dev-libs/rocr-runtime-5.0.2/work/ROCR-Runtime-rocm-5.0.2/src/image/addrlib/src/chip/r800/si_gb_reg.h:91:3: error: type ‘union GB_ADDR_CONFIG’ violates the C++ One Definition Rule [-Werror=odr]
Comment 3 Agostino Sarubbo gentoo-dev 2022-07-26 09:01:03 UTC
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 4 Agostino Sarubbo gentoo-dev 2024-02-18 14:41:04 UTC
lto_tinderbox has reproduced this issue with version 5.7.1-r1 - Updating summary.
Comment 5 Larry the Git Cow gentoo-dev 2024-03-12 02:25:45 UTC
The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=dde18ab04c546545dfae709f39d7bf029662a541

commit dde18ab04c546545dfae709f39d7bf029662a541
Author:     Eli Schwartz <eschwartz93@gmail.com>
AuthorDate: 2024-03-12 01:21:45 +0000
Commit:     Sam James <sam@gentoo.org>
CommitDate: 2024-03-12 02:24:46 +0000

    dev-libs/rocr-runtime: mark as LTO-unsafe
    
    Closes: https://bugs.gentoo.org/856091
    Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
    Signed-off-by: Sam James <sam@gentoo.org>

 dev-libs/rocr-runtime/rocr-runtime-5.7.1-r2.ebuild | 5 +++++
 dev-libs/rocr-runtime/rocr-runtime-6.0.0-r1.ebuild | 5 +++++
 2 files changed, 10 insertions(+)