I tried to get encrypted swap following the guide in the wiki.

However, ultimately,

/usr/lib/systemd/systemd-cryptsetup attach 'swap' '/dev/disk/by-uuid/13b0e159-8573-40f8-a308-b34f1bbf1a6f' '/dev/urandom' 'swap,offset=2048'

fails, which works on upstream archlinux. It gives:

Set cipher aes, mode cbc-essiv:sha256, key size 256 bits for device /dev/disk/by-uuid/13b0e159-8573-40f8-a308-b34f1bbf1a6f.
device-mapper: reload ioctl on   failed: No such file or directory
Failed to activate with key file '/dev/urandom'. (Key file missing?)
Please enter passphrase for disk Ultra_Line (swap): 
Loading of cryptographic parameters failed: Invalid argument

In the middle, it asks for a passphrase. On archlinux, the output is:

Set cipher aes, mode cbc-essiv:sha256, key size 256 bits for device /dev/loop0.

are we missing ciphers here somewhere (where?)?

As usual (for my boxes), everything is up-to-date on that machine:
cryptsetup 2.2.2-1.0
linux 5.1.15.arch1-1.0
systemd 243.162-2.0

Cheers,
Erich

/proc/cpuinfo:
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 15
model name : VIA Nano U3400@800MHz
stepping : 10
cpu MHz : 798.016
cache size : 2048 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush acpi mmx fxsr sse sse2 ss tm syscall nx lm constant_tsc arch_perfmon rep_good cpuid pni monitor vmx est tm2 ssse3 cx16 xtpr sse4_1 popcnt rng rng_en ace ace_en ace2 phe phe_en pmm pmm_en lahf_lm tpr_shadow vnmi vpid ida
vmx flags : vnmi tsc_offset vtpr
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
bogomips : 1596.53
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:

Other machine, also with via processor:

/proc/cpuinfo:
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 13
model name : VIA C7-D Processor 1800MHz
stepping : 0
cpu MHz : 1596.326
cache size : 128 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov pat clflush acpi mmx fxsr sse sse2 tm nx cpuid pni est tm2 xtpr rng rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
bogomips : 3193.67
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 32 bits virtual
power management:

All the __builtin_cpu_supports() and __builtin_cpu_is() tests fail. Thus, pacman thinks, it’s not capable of sse2 and installs i686 packages instead of pentium4 ones.

Should we complain at gcc upstream? How does the kernel compile this line in /proc/cpuinfo? What checks does it perform?

looks, like the new devtools do not strip packages anymore - maybe it was only an intermediate version, that lacked automatic stripping.

This seems to be a problem of either update-archlinux32-package in devops or of the (commented) code path in the PKGBUILD which gets executed by this script.

Real machines (i686) break apart in mutliple ways: systemd-journald fails to start, also udev seems to have trouble. This leaves one with a rescue console. And at least in my rescue console, my keyboard did not work.
I also have a pentium4 vm which won’t boot currently (I might give some details, when I have a little more time).

$ cc –version
cc: CPU ISA level is lower than required

The same happens in a chroot for [staging].

$ pacman -Qo /usr/bin/cc
/usr/bin/cc is owned by gcc 10.2.0-6.0

$ pacman -Q glibc
glibc 2.33-4.0

Does that mean, anything building with gcc is doomed on i686, currently?