Re: [NOTFORMERGE PATCH 1/2] configure: Use distrib meson

[Paolo Bonzini <pbonzini@redhat.com>]

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Il mer 8 nov 2023, 20:52 BALATON Zoltan <balaton@eik.bme.hu> ha scritto:

> AFAIU the problem is that macOS has system python in
> /Library/Frameworks/python.framework (or something like that) but homebrew
> does not use that but installs its own python somewhere in /opt and meson
> from homebrew uses that python but configure finds the system python which
> does not have meson so it then downloads its own meson but that's too old
> for macOS Sonoma


Correct (except s/downloads/installs/), basically --python/$PYTHON is the
sole interpreter used to run *any* Python code during the QEMU build. The
difference is that QEMU 8.1 would indeed download Meson, while QEMU 8.2
always uses the wheel that is shipped with QEMU. This change was done
because the embedded Meson is intended to be a "known good" version that we
(and pythondeps.toml) can point users to, in case a newer version from the
distro has issues. Of course the other side of the coin is that an older
version might not support new OSes as in this case.

The workaround below is not just a workaround but the intended solution if
one wants to use the Meson and Sphinx packages from homebrew, and cannot
modify the PATH to privilege homebrew's Python interpreter. In order to
support Sonoma out of the box with the system Python, however, we can bump
the shipped version of Meson to 1.2.x (and adjust pythondeps.toml).

Paolo

It should probably check for homebrew or macports
> locations too or check for meson and get the python that's using. A
> workaround apparently is to pass --python with the right path to
> configure.
>

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