https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: net-analyzer/nagios-plugins-2.4.0 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 794540 [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: configure: WARNING: Could not find mailq or equivalent configure: WARNING: Could not find qmail-qstat or equivalent configure: WARNING: Could not find smtpctl or equivalent configure: WARNING: Could not find sudo or equivalent configure: WARNING: nslookup command not found check_ntp.c:164:32: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing[https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wstrict-aliasing]]
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=cfa457c454509372a7cd9ba0d11e144f63a75e38 commit cfa457c454509372a7cd9ba0d11e144f63a75e38 Author: Michael Orlitzky <mjo@gentoo.org> AuthorDate: 2022-08-06 12:57:14 +0000 Commit: Michael Orlitzky <mjo@gentoo.org> CommitDate: 2022-08-06 13:01:17 +0000 net-analyzer/nagios-plugins: new revision with -fno-strict-aliasing. The code for the check_ntp plugin violates the strict aliasing rules of C, even though -fstrict-aliasing is enabled with -O2. First impression: it won't be easy to fix. So to prevent surprises, we append -fno-strict-aliasing to CFLAGS when it is supported. Closes: https://bugs.gentoo.org/861200 Signed-off-by: Michael Orlitzky <mjo@gentoo.org> .../nagios-plugins/nagios-plugins-2.4.0-r1.ebuild | 120 +++++++++++++++++++++ 1 file changed, 120 insertions(+)