https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: sci-libs/caffe2-1.12.0 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 796414 [details] build.log.xz build log and emerge --info (compressed because it exceeds attachment limit, use 'xzless' to read it)
Error(s) that match a know pattern in addition to what has been reported in the summary: -- Caffe2: Cannot find glog automatically. Using legacy find. -- Could NOT find Numa (missing: Numa_INCLUDE_DIR Numa_LIBRARIES) -- Could not find CUDA with FP16 support, compiling without torch.CudaHalfTensor -- Could not find hardware support for NEON on this machine. FAILED: lib/libtorch_cpu.so fatal: not a git repository (or any parent up to mount point /var/tmp) /var/tmp/portage/sci-libs/caffe2-1.12.0/work/pytorch-1.12.0/aten/src/ATen/native/cpu/moments_utils.h:76: error: type of ‘c_vecs’ does not match original declaration [-Werror=lto-type-mismatch]
Reported upstream: https://github.com/pytorch/pytorch/issues/82710
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=7dd94587118b7333242a46b4f97c22ed69d6fc0d commit 7dd94587118b7333242a46b4f97c22ed69d6fc0d Author: Alfredo Tupone <tupone@gentoo.org> AuthorDate: 2022-08-04 07:59:56 +0000 Commit: Alfredo Tupone <tupone@gentoo.org> CommitDate: 2022-08-04 07:59:56 +0000 sci-libs/caffe2: filter lto Closes: https://bugs.gentoo.org/862672 Package-Manager: Portage-3.0.30, Repoman-3.0.3 Signed-off-by: Alfredo Tupone <tupone@gentoo.org> sci-libs/caffe2/caffe2-1.11.0-r2.ebuild | 2 +- sci-libs/caffe2/caffe2-1.12.0.ebuild | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-)
