On the process issues mentioned:

We rely on upstream for the out-of-date flagging, there is no need to duplicate
this functionality.

https://archlinux32.org/packages/differences/ shows the differences to upstream:

Name	i486 Version	i686 Version	x86_64 Version	Repository	i486 Last Updated	i686 Last Updated

chezmoi	1.8.9-1.0	1.8.11-1.0	2.26.0-1	community	2020-11-28	
2021-02-12

The versions between subarchitectures differ, because we keep the latest working
version for a given subarchitecture. The alternative is to stick to the lowest
version or simply blacklist the package.

On chezmois: it's written in Go, i486 and i686 are currently not supported (if
I remember correctly there were some SSE2-requirement somewhere).

there is also an LTO problem:

# github.com/twpayne/chezmoi
flag provided but not defined: -flto

This boils down to a Go falling apart:

i686:

Building Go cmd/dist using /usr/lib/go. (go1.15.8 linux/386)
cmd/dist
go tool compile: exit status 1
unsupported setting GO386=softfloat
go tool compile: exit status 1
unsupported setting GO386=softfloat
go tool compile: exit status 1
unsupported setting GO386=softfloat

i486:

# runtime
unable to allocate additional stack space: errno 12

Let's see if the pentium4 version at least builds..

We could try to omit the 'go' compiler and instead use the 'gccgo', but this
would require patching of all go packages from upstream. Also we should check first, if gccgo can do more.

'gc'/'go' officially dropped everything not having SSE math and SSE2 (so FPU/MMX
math is no longer possible on i686).

go build: when using gccgo toolchain, please pass compiler flags using -gccgoflags, not -gcflags

Yeah, it builds on pentium4, i686, i484, but patching all go packages to use
gcc-go might be a little bit tedious. Let's do it with chezmoi as a test..

chezmoi has a PKGBUILD in community-x86_64 (2.x) and in extra-x86_64 (1.x) upstream,
it seems the right one is choosen by our toochain.

Also failing tests:

PASS
ok      github.com/twpayne/chezmoi/v2/pkg/cmd   11.325s
FAIL    github.com/twpayne/chezmoi/v2/pkg/git [build failed]
=== RUN   TestCurrentUserShell
--- PASS: TestCurrentUserShell (0.00s)
PASS
ok      github.com/twpayne/chezmoi/v2/pkg/shell 0.003s
FAIL

Let's not test the software and see if it works..

i486 and i686 with gcc-go fail brutally (as if gcc-go and gc implemented a
different language, see attached logs).

So chezmoi will be rebuild for pentium4 only and blacklisted for i686 and i486.

build logs with gcc-go

   chezmoi-2.26.0-1-i486-build.l... (98.7 KiB)
   chezmoi-2.26.0-1-i686-build.l... (98.7 KiB)