Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 856775 - dev-python/grpcio-1.43.0 fails to compile (lto): ev_epoll1_linux.cc:235: error: type struct grpc_pollset_set violates the C++ One Definition Rule [-Werror=odr]
Summary: dev-python/grpcio-1.43.0 fails to compile (lto): ev_epoll1_linux.cc:235: erro...
Status: RESOLVED FIXED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: No maintainer - Look at https://wiki.gentoo.org/wiki/Project:Proxy_Maintainers if you want to take care of it
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: lto
  Show dependency tree
 
Reported: 2022-07-07 04:13 UTC by Agostino Sarubbo
Modified: 2024-03-21 05:58 UTC (History)
1 user (show)

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


Attachments
build.log.xz (build.log.xz,33.73 KB, application/x-xz)
2022-07-07 04:13 UTC, Agostino Sarubbo
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Agostino Sarubbo gentoo-dev 2022-07-07 04:13:55 UTC
https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: dev-python/grpcio-1.43.0 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 2022-07-07 04:13:57 UTC
Created attachment 790457 [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 2022-07-07 04:13:59 UTC
Error(s) that match a know pattern in addition to what has been reported in the summary:


commands.CommandError: 
distutils.errors.DistutilsExecError: command 'x86_64-pc-linux-gnu-g++' failed with exit status 1
distutils.errors.LinkError: command 'x86_64-pc-linux-gnu-g++' failed with exit status 1
src/core/lib/iomgr/ev_epoll1_linux.cc:235: error: type ‘struct grpc_pollset_set’ violates the C++ One Definition Rule [-Werror=odr]
Comment 3 Agostino Sarubbo gentoo-dev 2022-07-26 09:01:11 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 Larry the Git Cow gentoo-dev 2024-03-21 05:58:40 UTC
The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=4586f5f9bbc3786a03d316a4a6a06175c66b362d

commit 4586f5f9bbc3786a03d316a4a6a06175c66b362d
Author:     Eli Schwartz <eschwartz93@gmail.com>
AuthorDate: 2024-03-21 03:43:39 +0000
Commit:     Sam James <sam@gentoo.org>
CommitDate: 2024-03-21 05:57:38 +0000

    dev-python/grpcio: mark as LTO-unsafe
    
    Closes: https://bugs.gentoo.org/856775
    Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
    Signed-off-by: Sam James <sam@gentoo.org>

 dev-python/grpcio/grpcio-1.51.0-r1.ebuild | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)