[1/3] rust: use "objects" for Rust executables as well

Commit Message

Paolo Bonzini April 5, 2025, 10:06 a.m. UTC

libqemuutil is not meant be linked as a whole; if modules are enabled, doing
so results in undefined symbols (corresponding to QMP commands) in
rust/qemu-api/rust-qemu-api-integration.

Support for "objects" in Rust executables is available in Meson 1.8.0; use it
to switching to the same dependencies that C targets use: link_with for
libqemuutil, and objects for everything else.

Reported-by: Bernhard Beschow <[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>
---
 docs/devel/rust.rst       |  2 --
 rust/qemu-api/meson.build | 26 +++++---------------------
 2 files changed, 5 insertions(+), 23 deletions(-)

Patch

diff --git a/docs/devel/rust.rst b/docs/devel/rust.rst
index 88bdec1eb28..8030aa42d0c 100644
--- a/docs/devel/rust.rst
+++ b/docs/devel/rust.rst
@@ -66,8 +66,6 @@  be run via ``meson test`` or ``make``::
 
    make check-rust
 
-Building Rust code with ``--enable-modules`` is not supported yet.
-
 Supported tools
 '''''''''''''''
 
diff --git a/rust/qemu-api/meson.build b/rust/qemu-api/meson.build
index 858685ddd4a..8fa41c0a95e 100644
--- a/rust/qemu-api/meson.build
+++ b/rust/qemu-api/meson.build
@@ -45,29 +45,13 @@  _qemu_api_rs = static_library(
   dependencies: [libc_dep, qemu_api_macros],
 )
 
+qemuutil_rs = qemuutil.partial_dependency(link_args: true, links: true)
+
 rust.test('rust-qemu-api-tests', _qemu_api_rs,
           suite: ['unit', 'rust'])
 
-qemu_api = declare_dependency(link_with: _qemu_api_rs)
-
-# Rust executables do not support objects, so add an intermediate step.
-rust_qemu_api_objs = static_library(
-    'rust_qemu_api_objs',
-    objects: [libqom.extract_all_objects(recursive: false),
-              libhwcore.extract_all_objects(recursive: false),
-              libchardev.extract_all_objects(recursive: false),
-              libcrypto.extract_all_objects(recursive: false),
-              libauthz.extract_all_objects(recursive: false),
-              libio.extract_all_objects(recursive: false),
-              libmigration.extract_all_objects(recursive: false)])
-rust_qemu_api_deps = declare_dependency(
-    dependencies: [
-      qom_ss.dependencies(),
-      chardev_ss.dependencies(),
-      crypto_ss.dependencies(),
-      authz_ss.dependencies(),
-      io_ss.dependencies()],
-    link_whole: [rust_qemu_api_objs, libqemuutil])
+qemu_api = declare_dependency(link_with: [_qemu_api_rs],
+  dependencies: [qemuutil_rs, qemu_api_macros, qom, hwcore, chardev, migration])
 
 test('rust-qemu-api-integration',
     executable(
@@ -76,7 +60,7 @@  test('rust-qemu-api-integration',
         override_options: ['rust_std=2021', 'build.rust_std=2021'],
         rust_args: ['--test'],
         install: false,
-        dependencies: [qemu_api, qemu_api_macros, rust_qemu_api_deps]),
+        dependencies: qemu_api),
     args: [
         '--test', '--test-threads', '1',
         '--format', 'pretty',