From: Daniel Dickman Subject: Re: Numpy segfaults on amd64 To: Stuart Henderson Cc: Stuart Cassoff , OpenBSD Ports Date: Fri, 16 Jan 2026 15:03:01 -0500 > On Jan 16, 2026, at 1:21 PM, Stuart Henderson wrote: > >> aggressive optimizations. A quick google search leads me to believe >> that your Core 2 Duo E8400 only goes up to SSE 4.1, so to fix I think we >> need an older baseline when numpy is being compiled. Maybe it is using >> SSE4.2 or AVX features which are trippping up your box. > > Stuart, if you run 'make' in py-numpy on this machine, what do you get > in the lines after 'CPU Optimization Options'? And, make sure you have > the lang/python/3/python.port.mk tweak I just committed and what do the > compiler lines look like? The box where the package is built would still need to be fixed though. Are you just looking to confirm the build time numpy detection? I think we can see what the cpu supports in the dmesg already? Maybe you’re looking for something else though? > > Even if I add > > MODPY_PYBUILD_ARGS= -Csetup-args=-Dcpu-baseline=min \ > -Csetup-args=-Dcpu-dispatch=min > > it builds with these flags: > > -O3 -fno-strict-aliasing -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mpopcnt -msahf -mcx16 -DHWY_WANT_SSE4 -DHWY_DISABLE_PCLMUL_AES -DNPY_HAVE_X86_V2 -DNPY_HAVE_SSE -DNPY_HAVE_SSE2 -DNPY_HAVE_SSE3 -DNPY_HAVE_SSSE3 -DNPY_HAVE_SSE41 -DNPY_HAVE_SSE42 -DNPY_HAVE_POPCNT -DNPY_HAVE_LAHF -DNPY_HAVE_CX16 -O2 -pipe -g -fPIC > > which isn't what we want. Maybe easiest is to just disable optimizations on amd64 the same as we do on i386? I suspect that will fix things on this box but would be good to confirm. >