From: Marc-André Lureau <[email protected]>
bindgen < 0.72.1 linked against libclang >= 22 generates opaque structs
for C types declared with "typedef struct X X;" forward declarations,
common in QEMU. The struct fields are missing from the generated Rust
bindings. For example, with bindgen 0.71.x and LLVM 22, a struct like:
typedef struct VMStateField VMStateField;
struct VMStateField {
const char *name;
int version_id;
};
produces:
pub struct VMStateField {
pub _address: u8,
}
instead of:
pub struct VMStateField {
pub name: *const c_char,
pub version_id: c_int,
}
The build then fails with:
error[E0609]: no field `version_id` on type `VMStateField`
error[E0609]: no field `flags` on type `VMStateField`
error[E0560]: struct `util_sys::Error` has no field named `msg`
Check the bindgen version against llvm-config at configure time. With
-Drust=enabled, error out; with -Drust=auto, disable Rust and suggest
the upgrade.
Signed-off-by: Marc-Andre Lureau <[email protected]>
---
meson.build | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/meson.build b/meson.build
index 164328ded83..c965cef352e 100644
--- a/meson.build
+++ b/meson.build
@@ -125,6 +125,25 @@ if have_rust
have_rust = false
endif
endif
+
+ # bindgen < 0.72.1 generates opaque structs for "typedef struct X X;"
+ # patterns when linked against libclang >= 22.
+ if have_rust and bindgen.version().version_compare('<0.72.1')
+ llvm_config = find_program('llvm-config', required: false)
+ if llvm_config.found()
+ llvm_version = run_command(llvm_config, '--version',
+ check: true).stdout().strip()
+ if llvm_version.version_compare('>=22.0.0')
+ if get_option('rust').enabled()
+ error('bindgen ' + bindgen.version() + ' is incompatible with LLVM '
+ llvm_version + '. ' +
+ 'Please upgrade with "cargo install --locked
[email protected]"')
+ else
+ warning('bindgen ' + bindgen.version() + ' is incompatible with LLVM
' + llvm_version + ', disabling Rust.')
+ have_rust = false
+ endif
+ endif
+ endif
+ endif
endif
if have_rust
--
2.55.0
