https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: games-fps/rott-1.1.2-r1 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
Created attachment 792131 [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
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=214dbaa6ba17af414093d38e2310b48a0e01967e commit 214dbaa6ba17af414093d38e2310b48a0e01967e Author: Eli Schwartz <eschwartz93@gmail.com> AuthorDate: 2024-03-05 23:05:30 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2024-03-06 03:36:18 +0000 games-fps/rott: mark as LTO-unsafe The upstream website is being clever and suggesting that distros are the real upstreams, and that releases happen by, every couple of years, collecting all the patches distros have applied and turning that into a release. Hopeless. No bug reporting mechanism. Closes: https://bugs.gentoo.org/858758 Signed-off-by: Eli Schwartz <eschwartz93@gmail.com> Signed-off-by: Sam James <sam@gentoo.org> games-fps/rott/rott-1.1.2-r1.ebuild | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
