rust: add --rust-target option for bindgen

Without it, recent bindgen will give an error

   error: extern block cannot be declared unsafe

if rustc is not new enough to support the "unsafe extern" construct.

Cc: qemu-rust@nongnu.org
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20250206111514.2134895-1-pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 131c58469f6fb68c89b38fee6aba8bbb20c7f4bf)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/meson.build b/meson.build
index 7a3faca61d4f87f1825cff181c8d3ab5c0a76c0a..7f6f63867667fbe8f6e4dbbf9e51292800bacefe 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -4050,6 +4050,9 @@ if have_rust
       bindgen_args += ['--formatter', 'none']
     endif
   endif
+  if bindgen.version().version_compare('>=0.66.0')
+    bindgen_args += ['--rust-target', '1.59']
+  endif
   if bindgen.version().version_compare('<0.61.0')
     # default in 0.61+
     bindgen_args += ['--size_t-is-usize']