https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: net-misc/megasync-4.5.0.0 fails to compile (lto). Discovered on: amd64 (internal ref: guru_tinderbox) NOTE: This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing
Created attachment 793553 [details] build.log.xz build log and emerge --info (compressed because it exceeds attachment limit, use 'xzless' to read it)
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/proj/guru.git/commit/?id=59e8bfb0ef3006bb24904a4349aed1ce3c385d92 commit 59e8bfb0ef3006bb24904a4349aed1ce3c385d92 Author: Takuya Wakazono <pastalian46@gmail.com> AuthorDate: 2023-11-23 05:53:43 +0000 Commit: Takuya Wakazono <pastalian46@gmail.com> CommitDate: 2023-11-23 05:53:43 +0000 net-misc/megasync: drop 4.10.0.0 Closes: https://bugs.gentoo.org/791916 Closes: https://bugs.gentoo.org/791919 Closes: https://bugs.gentoo.org/791922 Closes: https://bugs.gentoo.org/800647 Closes: https://bugs.gentoo.org/833316 Closes: https://bugs.gentoo.org/860318 Closes: https://bugs.gentoo.org/898154 Signed-off-by: Takuya Wakazono <pastalian46@gmail.com> .../megasync/files/megasync-4.5.0.0_ffmpeg.patch | 24 ---- .../megasync/files/megasync-4.5.0.0_pdfium.patch | 16 --- net-misc/megasync/megasync-4.10.0.0.ebuild | 149 --------------------- net-misc/megasync/metadata.xml | 1 - 4 files changed, 190 deletions(-)
