Re: [PATCH v2 13/14] meson: Deprecate 32-bit host support

["Alex Bennée" <alex.bennee@linaro.org>]

Richard Henderson <richard.henderson@linaro.org> writes:

> We deprecated i686 system mode support for qemu 8.0.  However, to
> make real cleanups to TCG we need to deprecate all 32-bit hosts.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  docs/about/deprecated.rst | 7 +++++++
>  meson.build               | 6 ++----
>  2 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
> index 4a3c302962..7c61d0ba16 100644
> --- a/docs/about/deprecated.rst
> +++ b/docs/about/deprecated.rst
> @@ -204,6 +204,13 @@ is going to be so much slower it wouldn't make sense for any serious
>  instrumentation. Due to implementation differences there will also be
>  anomalies in things like memory instrumentation.
>  
> +32-bit host operating systems (since 10.0)
> +''''''''''''''''''''''''''''''''''''''''''
> +
> +Keeping 32-bit host support alive is a substantial burden for the
> +QEMU project.  Thus QEMU will in future drop the support for all
> +32-bit host systems.
> +
>  System emulator CPUs
>  --------------------
>  
> diff --git a/meson.build b/meson.build
> index 866b8ce477..0dae54da0d 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -4833,14 +4833,12 @@ if host_arch == 'unknown'
>      message('configure has succeeded and you can continue to build, but')
>      message('QEMU will use a slow interpreter to emulate the target CPU.')
>    endif
> -elif host_arch == 'mips'
> +elif host_long_bits < 64
>    message()
>    warning('DEPRECATED HOST CPU')
>    message()
>    message('Support for CPU host architecture ' + cpu + ' is going to
> be')

 Support for 32 bit host architecture...?

> -  message('dropped as soon as the QEMU project stops supporting Debian 12')
> -  message('("Bookworm"). Going forward, the QEMU project will not guarantee')
> -  message('that QEMU will compile or work on this host CPU.')
> +  message('dropped in a future QEMU release.')
>  endif
>  
>  if not supported_oses.contains(host_os)

Otherwise:

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro