incus 6.7 fails to (cross)compile on 32bit archs

[dkwo]

I believe the relevant errors are

# github.com/lxc/incus/v6/internal/linux
In file included from internal/linux/socket_linux_cgo.go:25:
internal/linux/../../shared/cgo/process_utils.h: In function 'setproctitle':
internal/linux/../../shared/cgo/process_utils.h:222:30: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
  222 |                 char *dest = (char *)arg_start;
      |                              ^
cc1: all warnings being treated as errors
github.com/mitchellh/mapstructure
html
github.com/russross/blackfriday/v2
gopkg.in/yaml.v3
github.com/cpuguy83/go-md2man/v2/md2man
net/http/httputil
github.com/gorilla/mux
# github.com/lxc/incus/v6/shared/idmap
In file included from shared/idmap/shift_linux.go:26:
shared/idmap/../../shared/cgo/process_utils.h: In function 'setproctitle':
shared/idmap/../../shared/cgo/process_utils.h:222:30: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
  222 |                 char *dest = (char *)arg_start;
      |                              ^
cc1: all warnings being treated as errors

as seen in void-linux/void-packages#53135

[stgraber]

I've pinged @brauner who I believe is the original author of that code from liblxc.

It's pretty dark magic that we're pulling in there so I'd prefer someone who knows what they're doing with C to look at sorting this one out ;)

[ncopa]

FWIW, it not only happens when crosscompiling. It also happens on native 32 bit build.

[stgraber]

Yeah, which is a bit odd considering it's code we took from liblxc which has shipped for years on 32bit platforms :)

[rnalrd]

Adding -Wno-int-to-pointer-cast to CGO_CFLAGS allowed to build on Alpine Linux 32-bit

[ncopa]

I suppose it is gcc 14 that is stricter about things.

cc1: all warnings being treated as errors

Generally not a good idea with -Werror on releases (but very good in CI /development)