man make.conf states, that COPTFLAGS is used for building/compiling the kernel (exclusively). The question arises: are kernel modules NOT kernel or are they kernel?
The problem I face is that with optimization level -O3 loader.efi gets miscompiled and a UEFI laptop stops/reject booting. To avoid other interference, I defined COPTFLAGS in /etc/src.conf accordingly, but leave CFLAGS?=-O3 in /etc/make.conf for compilation of regular ports and the rest of the OS. I can observe that with CFLAGS set, either in make.conf, or src.conf or mutual exclusive, the CFLAGS is ALWAYS incorporated when kernel stuff like modules and even the loader.efi is built! I consider this inconsitent, since loader.efi is definitely kernel related stuff as well as modules. It seems to me that it s not possible to separate cleanly CFLAGS and COPTFLAGS for userland/ports and kernel-only related compilations as described in the man page.
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