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aspmx1.migadu.com; dkim=none; spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Spam-Score: -2.45 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Queue-Id: 1A92920D0C X-Spam-Score: -2.45 X-Migadu-Scanner: scn0.migadu.com X-TUID: JVmegxJ69gYi From: --8<---------------cut here---------------start------------->8--- $ guix describe Generacio 181 Apr 26 2021 08:47:48 (nuna) guix d904abe repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: d904abe0768293b2322dbf355b6e41d94e769d78 $ guix build swig --log-file https://ci.guix.gnu.org/log/2l8f4sjw0jbfll4ilp7pzwimrh5kjdgf-swig-4.0.1 --8<---------------cut here---------------end--------------->8--- =E2=80=A6 we can see lots of warnings like this one: --8<---------------cut here---------------start------------->8--- checking perl5 testcase abstract_inherit_ok In file included from /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.3= 1/include/bits/libc-header-start.h:33:0, from /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.3= 1/include/string.h:26, from li_cstring_wrap.cxx:342: /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include/features.h:3= 97:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimizatio= n (-O) [-Wcpp] # warning _FORTIFY_SOURCE requires compiling with optimization (-O) ^~~~~~~ --8<---------------cut here---------------end--------------->8--- Compiling without optimizations sounds like a bad idea. We should add -O2 somewhere to the CFLAGS. Ludo=E2=80=99.