https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: dev-games/clanlib-0.8.1-r2 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 788921 [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
Version 4.1.0 no longer has this problem.
(In reply to Eli Schwartz from comment #3) > Version 4.1.0 no longer has this problem. right, but slot 0.8 is still affected. The best is keep this open until we remove that version
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8d11899d26e069449b3f753623a3e93cdf21b063 commit 8d11899d26e069449b3f753623a3e93cdf21b063 Author: Eli Schwartz <eschwartz93@gmail.com> AuthorDate: 2024-06-30 23:36:36 +0000 Commit: Eli Schwartz <eschwartz@gentoo.org> CommitDate: 2024-07-03 22:36:47 +0000 dev-games/clanlib: mark as strict-aliasing unsafe Fixed in newer slots. Closes: https://bugs.gentoo.org/855308 Signed-off-by: Eli Schwartz <eschwartz93@gmail.com> Signed-off-by: Eli Schwartz <eschwartz@gentoo.org> dev-games/clanlib/clanlib-0.8.1-r2.ebuild | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
