Re: Building tools on unsupported cpu/arch

[Michael Tokarev]

20.06.2022 13:31, Thomas Huth write:
> On 30/04/2022 16.11, Michael Tokarev wrote:
> > Hello!
> >
> > Previously, it was possible to build qemu tools (such as qemu-img, or qemu-ga)
> > on an unsupported cpu/architecture.  In a hackish way, by specifying
> > --enable-tcg-interpreter on the ./configure line.
> >
> > Today (with 7.0), it does not work anymore, with the following error
> > during configure:
> >
> >   common-user/meson.build:1:0: ERROR: Include dir host/unknown does not exist.
>
> Did you ever send a patch for this? I something like this should do the job:
>
> diff a/common-user/meson.build b/common-user/meson.build
> --- a/common-user/meson.build
> +++ b/common-user/meson.build
> @@ -1,3 +1,7 @@
> +if not have_user
> +   subdir_done()
> +endif
> +

https://salsa.debian.org/qemu-team/qemu/-/blob/master/debian/patches/common-user-no-user.patch

I dunno which one is right - "have_user" or "have_linux_user & have_bsd_user".

>   common_user_inc += include_directories('host/' / host_arch)
>
>   user_ss.add(files(
>
>
> > This is with --disable-system --disable-linux-user --disable-user.
> >
> > And without --enable-tcg-interpreter, it gives:
> >
> >   meson.build:390:6: ERROR: Problem encountered: Unsupported CPU m68k, try 
> > --enable-tcg-interpreter
> >
> > What's the way to build tools on an unsupported architecture these days?
>
> You could try to use --disable-tcg instead of --enable-tcg-interpreter ... but I guess we should improve the logic in configure / meson.build a little 
> bit to do that automatically...

It fails down the line when building trace files, I don't remember where 
exactly.
It's trivial to reproduce and the failure is at the beginning of the build 
procedure.

> I guess Philippe's patch from February should do the job:
>
>   https://lists.gnu.org/archive/html/qemu-devel/2022-02/msg00894.html

Lemme give it a try...

Thanks,

/mjt