https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: games-emulation/desmume-0.9.13 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 791981 [details] build.log build log and emerge --info
Error(s) that match a know pattern in addition to what has been reported in the summary: FAILED: libdesmume.a.p/.._.._SPU.cpp.o Run-time dependency openal found: NO (tried pkgconfig and cmake) ../desmume-0.9.13/desmume/src/SPU.cpp:2061:39: error: dereferencing type-punned pointer will break strict-aliasing rules [-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
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1cdd5937af974cd53b9ee5b138031a310d5ab265 commit 1cdd5937af974cd53b9ee5b138031a310d5ab265 Author: Ionen Wolkens <ionen@gentoo.org> AuthorDate: 2022-11-21 01:52:57 +0000 Commit: Ionen Wolkens <ionen@gentoo.org> CommitDate: 2022-11-21 04:55:31 +0000 games-emulation/desmume: fix w/ clang16, filter-lto + -fno-strict Looking a bit fragile for LTO overall, so haven't looked into doing proper fixes. Also GPL-2 -> GPL-2+ Closes: https://bugs.gentoo.org/858629 Closes: https://bugs.gentoo.org/874996 Signed-off-by: Ionen Wolkens <ionen@gentoo.org> .../desmume/{desmume-0.9.13.ebuild => desmume-0.9.13-r1.ebuild} | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)