[PATCH v3 00/23] rust: fix CI + allow older versions of rustc and bindgen

[Paolo Bonzini <pbonzini@redhat.com>]

Since Manos helpfully posted his vmstate patches, this series is all that
is needed in order to enable Rust for at least the Debian, Fedora and
Ubuntu jobs.  I took his patches and isolated them from the procedural
macro experiment.

There are quite a few changes from the previous posting:

- new patches to bring pl011 mostly up to date with the C code (1-7)

- remove unnecessary .gitattributes file (8)

- apply rustfmt throughout

- add "rust: create a cargo workspace" to ensure a single version of the
  dependencies is used for all cargo commands (14, based on a suggestion by
  Junjie)

- add Junjie's syntax checks to the offset_of! macro.  I added a small
  struct with a From<> implementation, to make compile errors even easier
  to report (15).

- add final patch to enable rust in the Debian and Ubuntu system build
  jobs (23)

Note that this requires "meson subprojects update --reset" in order to do
an incremental build if you have already downloaded the Rust subprojects.
While I have a solution for that (modeled after scripts/git-submodule.sh),
I first need to check with the Meson folks whether my script is using only
stable interfaces.

This series can be found at branch rust-next of my git repository
(https://gitlab.com/bonzini/qemu.git), which also helps with the
problems in applying patch 8.  Everything up to commit f6a46d2a4eb
("rust: do not use TYPE_CHARDEV unnecessarily", 2024-10-25) will be
my next pull request, which I will send early next week (to give
people some more days to complain).

Paolo

Supersedes: <20241022100956.196657-1-pbonzini@redhat.com>

CI: https://gitlab.com/bonzini/qemu/-/pipelines/1512732399


Manos Pitsidianakis (6):
  rust: add definitions for vmstate
  rust/pl011: add support for migration
  rust/pl011: move CLK_NAME static to function scope
  rust/pl011: add TYPE_PL011_LUMINARY device
  rust/pl011: remove commented out C code
  rust/pl011: Use correct masks for IBRD and FBRD

Paolo Bonzini (17):
  rust/pl011: fix default value for migrate-clock
  rust: patch bilge-impl to allow compilation with 1.63.0
  rust: fix cfgs of proc-macro2 for 1.63.0
  rust: use std::os::raw instead of core::ffi
  rust: introduce a c_str macro
  rust: silence unknown warnings for the sake of old compilers
  rust: synchronize dependencies between subprojects and Cargo.lock
  rust: create a cargo workspace
  rust: introduce alternative implementation of offset_of!
  rust: do not use MaybeUninit::zeroed()
  rust: clean up detection of the language
  rust: allow version 1.63.0 of rustc
  rust: do not use --generate-cstr
  rust: allow older version of bindgen
  rust: make rustfmt optional
  dockerfiles: install bindgen from cargo on Ubuntu 22.04
  ci: enable rust in the Debian and Ubuntu system build job

 docs/about/build-platforms.rst                |  12 +
 meson.build                                   | 102 +++--
 .gitattributes                                |   2 +
 .gitlab-ci.d/buildtest.yml                    |   6 +-
 meson_options.txt                             |   2 +
 rust/{hw/char/pl011 => }/Cargo.lock           |   4 +
 rust/Cargo.toml                               |   7 +
 rust/hw/char/pl011/Cargo.toml                 |   3 -
 rust/hw/char/pl011/src/device.rs              | 158 ++++++--
 rust/hw/char/pl011/src/device_class.rs        |  71 +++-
 rust/hw/char/pl011/src/lib.rs                 |   5 +-
 rust/hw/char/pl011/src/memory_ops.rs          |  14 +-
 rust/qemu-api-macros/Cargo.lock               |  47 ---
 rust/qemu-api-macros/Cargo.toml               |   5 +-
 rust/qemu-api-macros/src/lib.rs               |  81 +++-
 rust/qemu-api/Cargo.lock                      |   7 -
 rust/qemu-api/Cargo.toml                      |  10 +-
 rust/qemu-api/build.rs                        |   9 +
 rust/qemu-api/meson.build                     |  17 +-
 rust/qemu-api/src/c_str.rs                    |  53 +++
 rust/qemu-api/src/definitions.rs              |   2 +-
 rust/qemu-api/src/device_class.rs             |  43 +--
 rust/qemu-api/src/lib.rs                      |  19 +-
 rust/qemu-api/src/offset_of.rs                | 161 ++++++++
 rust/qemu-api/src/vmstate.rs                  | 358 ++++++++++++++++++
 rust/qemu-api/src/zeroable.rs                 |  91 ++++-
 rust/qemu-api/tests/tests.rs                  |  29 +-
 scripts/meson-buildoptions.sh                 |   4 +
 subprojects/bilge-impl-0.2-rs.wrap            |   1 +
 .../packagefiles/bilge-impl-1.63.0.patch      |  45 +++
 .../packagefiles/proc-macro2-1-rs/meson.build |   4 +-
 subprojects/packagefiles/syn-2-rs/meson.build |   1 +
 tests/docker/dockerfiles/ubuntu2204.docker    |   5 +
 tests/lcitool/mappings.yml                    |   4 +
 tests/lcitool/refresh                         |  11 +-
 35 files changed, 1166 insertions(+), 227 deletions(-)
 rename rust/{hw/char/pl011 => }/Cargo.lock (98%)
 create mode 100644 rust/Cargo.toml
 delete mode 100644 rust/qemu-api-macros/Cargo.lock
 delete mode 100644 rust/qemu-api/Cargo.lock
 create mode 100644 rust/qemu-api/src/c_str.rs
 create mode 100644 rust/qemu-api/src/offset_of.rs
 create mode 100644 rust/qemu-api/src/vmstate.rs
 create mode 100644 subprojects/packagefiles/bilge-impl-1.63.0.patch

-- 
2.47.0