Summary: | dev-ruby/nio4r-2.7.0 fails to compile (lto): ev.h:691:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] | ||
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Product: | Gentoo Linux | Reporter: | Agostino Sarubbo <ago> |
Component: | Current packages | Assignee: | Gentoo Ruby Team <ruby> |
Status: | RESOLVED FIXED | ||
Severity: | normal | CC: | esigra |
Priority: | Normal | ||
Version: | unspecified | ||
Hardware: | All | ||
OS: | Linux | ||
URL: | https://github.com/socketry/nio4r/issues/289 | ||
Whiteboard: | Bundled/forked libev is broken, not much we can do except filter/append flags | ||
Package list: | Runtime testing required: | --- | |
Bug Depends on: | 855869 | ||
Bug Blocks: | 251464, 618550 | ||
Attachments: | build.log |
Description
Agostino Sarubbo
2022-07-12 06:45:21 UTC
Created attachment 791135 [details]
build.log
build log and emerge --info
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 lto_tinderbox has reproduced this issue with version 2.7.0 - Updating summary. The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=7c5bf9a42324f8c9958f7f251d0396868b3e9481 commit 7c5bf9a42324f8c9958f7f251d0396868b3e9481 Author: Sam James <sam@gentoo.org> AuthorDate: 2024-02-29 00:50:05 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2024-02-29 00:50:07 +0000 dev-ruby/nio4r: filter LTO, no-SA Broken quite badly via bundled liebv, no upstream bug tracker for libev AFAICT. And broken in many bundled copies all over the place (which are modified...) Closes: https://bugs.gentoo.org/857741 Signed-off-by: Sam James <sam@gentoo.org> dev-ruby/nio4r/nio4r-2.5.9.ebuild | 8 ++++++-- dev-ruby/nio4r/nio4r-2.6.1.ebuild | 8 ++++++-- dev-ruby/nio4r/nio4r-2.7.0.ebuild | 8 ++++++-- 3 files changed, 18 insertions(+), 6 deletions(-) |