https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: x11-libs/neXtaw-0.15.1-r3 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 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
Created attachment 798959 [details] build.log build log and emerge --info
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=bd7aa280e36e37620e378c70aed1f0c04c80969e commit bd7aa280e36e37620e378c70aed1f0c04c80969e Author: Ionen Wolkens <ionen@gentoo.org> AuthorDate: 2022-10-13 08:11:05 +0000 Commit: Ionen Wolkens <ionen@gentoo.org> CommitDate: 2022-10-13 09:06:07 +0000 x11-libs/neXtaw: EAPI7->8, fix w/ clang16, -std=gnu89 + -fno-strict clang16 fixes regenerates some flex/yacc files so BDEPEND on them. Haven't looked for a proper fix wrt #864535, may be easy but passing -fno-strict-aliasing as better-than-nothing. Closes: https://bugs.gentoo.org/864535 Closes: https://bugs.gentoo.org/871489 Signed-off-by: Ionen Wolkens <ionen@gentoo.org> x11-libs/neXtaw/files/neXtaw-0.15.1-clang16.patch | 27 ++++++++++++++++ ...aw-0.15.1-r3.ebuild => neXtaw-0.15.1-r4.ebuild} | 37 +++++++++++++++------- 2 files changed, 52 insertions(+), 12 deletions(-)
