https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: dev-util/boost-build-1.79.0 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
Created attachment 791678 [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
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=83a9d34ca794ea0fec5ea5deb5dce8fd8a56bdbf commit 83a9d34ca794ea0fec5ea5deb5dce8fd8a56bdbf Author: David Seifert <soap@gentoo.org> AuthorDate: 2022-09-03 20:28:26 +0000 Commit: David Seifert <soap@gentoo.org> CommitDate: 2022-09-03 20:28:26 +0000 dev-util/boost-build: add 1.80.0 Bug: https://bugs.gentoo.org/858320 Bug: https://bugs.gentoo.org/865527 Signed-off-by: David Seifert <soap@gentoo.org> dev-util/boost-build/Manifest | 1 + dev-util/boost-build/boost-build-1.80.0.ebuild | 66 +++++++++ ...ost-build-1.80.0-add-none-feature-options.patch | 22 +++ ...oost-build-1.80.0-no-implicit-march-flags.patch | 148 +++++++++++++++++++++ .../boost-build/files/boost-build-1.80.0-odr.patch | 54 ++++++++ .../boost-build-1.80.0-respect-user-flags.patch | 11 ++ 6 files changed, 302 insertions(+)
lto_tinderbox has reproduced this issue with version 1.79.0-r1 - Updating summary.
# Andreas Sturmlechner <asturm@gentoo.org> (2022-12-03) # No purpose anymore after <dev-libs/boost-1.80 cleanup. # Removal on 2022-12-16 dev-util/boost-build
