https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: sci-mathematics/fann-2.2.0-r1 installs pkg-config files that do not respect libdir. 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 796897 [details] build.log build log and emerge --info
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f747ba062e648f090c223540ad9d3266fcfe2e7e commit f747ba062e648f090c223540ad9d3266fcfe2e7e Author: NHOrus <jy6x2b32pie9@yahoo.com> AuthorDate: 2025-03-25 18:29:00 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2025-04-12 20:54:20 +0000 sci-mathematics/fann: update EAPI 7 -> 8, other fixes Patch out bundled GTest, fix install directory for pkg-config files Closes: https://bugs.gentoo.org/951922 Closes: https://bugs.gentoo.org/863050 Signed-off-by: NHOrus <jy6x2b32pie9@yahoo.com> Closes: https://github.com/gentoo/gentoo/pull/41260 Signed-off-by: Sam James <sam@gentoo.org> sci-mathematics/fann/fann-9999.ebuild | 33 +++++++++++++++++++++--- sci-mathematics/fann/files/fann-9999-cmake.patch | 23 +++++++++++++++++ 2 files changed, 52 insertions(+), 4 deletions(-) https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5748b186c37cc0597d5f7efa2455d8f90d31793b commit 5748b186c37cc0597d5f7efa2455d8f90d31793b Author: NHOrus <jy6x2b32pie9@yahoo.com> AuthorDate: 2025-03-24 13:12:30 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2025-04-12 20:54:19 +0000 sci-mathematics/fann: update EAPI 7 -> 8, fix build with CMake 4 Also correct installation folder for pkg-config files Closes: https://bugs.gentoo.org/863050 Closes: https://bugs.gentoo.org/951922 Signed-off-by: NHOrus <jy6x2b32pie9@yahoo.com> Signed-off-by: Sam James <sam@gentoo.org> sci-mathematics/fann/fann-2.2.0-r2.ebuild | 47 +++++++++++++++++++++++ sci-mathematics/fann/files/fann-2.2.0-cmake.patch | 22 +++++++++++ 2 files changed, 69 insertions(+)
