[PATCH 15/16] rust: do not use --generate-cstr

[Paolo Bonzini]

--generate-cstr is a good idea and generally the right thing to do,
but it is not available in Debian 12 and Ubuntu 22.04.  Work around
the absence.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 meson.build                       | 4 +++-
 rust/hw/char/pl011/src/device.rs  | 1 +
 rust/qemu-api/src/device_class.rs | 8 +++++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index 3b35fcb3feb..e08f226ee8a 100644
--- a/meson.build
+++ b/meson.build
@@ -3920,13 +3920,15 @@ common_all = static_library('common',
                             dependencies: common_ss.all_dependencies())
 
 if have_rust and have_system
+  # We would like to use --generate-cstr, but it is only available
+  # starting with bindgen 0.66.0.  The oldest supported versions
+  # are in Ubuntu 22.04 (0.59.1) and Debian 12 (0.60.1).
   bindgen_args = [
     '--disable-header-comment',
     '--raw-line', '// @generated',
     '--ctypes-prefix', 'std::os::raw',
     '--formatter', 'rustfmt',
     '--generate-block',
-    '--generate-cstr',
     '--impl-debug',
     '--merge-extern-blocks',
     '--no-doc-comments',
diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index ca67d452e7e..ec82a2619f2 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -13,6 +13,7 @@
     bindings::{self, *},
     c_str,
     definitions::ObjectImpl,
+    device_class::TYPE_SYS_BUS_DEVICE,
     with_offsets,
 };
 
diff --git a/rust/qemu-api/src/device_class.rs 
b/rust/qemu-api/src/device_class.rs
index d2535125c48..f4eec2f748a 100644
--- a/rust/qemu-api/src/device_class.rs
+++ b/rust/qemu-api/src/device_class.rs
@@ -2,7 +2,9 @@
 // Author(s): Manos Pitsidianakis <manos.pitsidiana...@linaro.org>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-use crate::bindings::Property;
+use std::ffi::CStr;
+
+use crate::bindings::{self, Property};
 
 #[macro_export]
 macro_rules! device_class_init {
@@ -129,3 +131,7 @@ macro_rules! vm_state_description {
         };
     }
 }
+
+// workaround until we can use --generate-cstr in bindgen.
+pub const TYPE_SYS_BUS_DEVICE: &CStr =
+    unsafe { 
CStr::from_bytes_with_nul_unchecked(bindings::TYPE_SYS_BUS_DEVICE) };
-- 
2.46.2