Re: [RFC PATCH] buildsys: Stop checking for ESA/390 host

[Cornelia Huck <cohuck@redhat.com>]

On Tue, May 19 2026, Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il mar 19 mag 2026, 16:59 Philippe Mathieu-Daudé <philmd@linaro.org> ha
> scritto:
>
>> We still build QEMU tools on 32-bit hosts (see commit
>> cf634dfcd8f), however no OS supported by QEMU still runs
>> on ESA/390 (Linux dropped support in release 4.1 in 2015).
>>
>
> If Linux still supports 31-bit *userspace binaries*, I would keep the
> configure check, so that 32-bit s390 is properly detected as an unsupported
> CPU:

FWIW, Linux removed support for the 31 bit compat code in v6.19 (late
last year); it is unclear if anyone had been using it recently anyway.

>
> elif check_define __s390__ ; then
>>   if check_define __s390x__ ; then
>>     cpu="s390x"
>>   else
>>     cpu="s390"
>>   fi
>>
>
> and perhaps keep the CPU_CFLAGS only from the other hunk:
>
>   s390)
>>     linux_arch=s390
>>     CPU_CFLAGS="-m31"
>>     ;;
>>
>
>    s390x)
>>      host_arch=s390x
>>      linux_arch=s390
>>

I'm also wondering if anyone had actually tried to use QEMU on such a
setup recently; I don't have a setup to test that in any case.