https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: net-wireless/libxtrxll-0.0_p20201202 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 795452 [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: -- Package 'libusb3380', required by 'virtual:world', not found FAILED: CMakeFiles/xtrxll.dir/xtrxll_base.c.o FAILED: mod_pcie/CMakeFiles/xtrxll_pcie.dir/xtrxll_pcie_linux.c.o /var/tmp/portage/net-wireless/libxtrxll-0.0_p20201202/work/libxtrxll-1b6eddfbedc700efb6f7e3c3594e43ac6ff29ea4/mod_pcie/xtrxll_pcie_linux.c:127:19: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b4e704a3cb668ba1a6fc85ca9364bfde73db1e14 commit b4e704a3cb668ba1a6fc85ca9364bfde73db1e14 Author: Eli Schwartz <eschwartz93@gmail.com> AuthorDate: 2024-03-12 03:33:31 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2024-03-12 03:36:54 +0000 net-wireless/libxtrxll: mark as LTO-unsafe, strict-aliasing unsafe Closes: https://bugs.gentoo.org/861932 Signed-off-by: Eli Schwartz <eschwartz93@gmail.com> Signed-off-by: Sam James <sam@gentoo.org> net-wireless/libxtrxll/libxtrxll-0.0_p20201202.ebuild | 12 ++++++++++-- net-wireless/libxtrxll/libxtrxll-9999.ebuild | 12 ++++++++++-- 2 files changed, 20 insertions(+), 4 deletions(-)
