[RFC v3 23/32] qga/rust: build and link an empty static library

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 Cargo.lock      |  4 ++++
 Cargo.toml      |  1 +
 qga/Cargo.toml  |  9 +++++++++
 qga/lib.rs      |  0
 qga/meson.build | 20 +++++++++++++++++++-
 5 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 qga/Cargo.toml
 create mode 100644 qga/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index f2cd0ee96e..2f5b202605 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -68,3 +68,7 @@ version = "0.0.1"
 dependencies = [
  "common",
 ]
+
+[[package]]
+name = "qga"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index f4a078e62d..3db0646413 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
 members = [
+  "qga",
   "rust/common",
   "tests",
 ]
diff --git a/qga/Cargo.toml b/qga/Cargo.toml
new file mode 100644
index 0000000000..a3bffd1fec
--- /dev/null
+++ b/qga/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "qga"
+version = "0.1.0"
+edition = "2018"
+publish = false
+
+[lib]
+path = "lib.rs"
+crate-type = ["staticlib"]
diff --git a/qga/lib.rs b/qga/lib.rs
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/qga/meson.build b/qga/meson.build
index 1b050d8c53..d272892ced 100644
--- a/qga/meson.build
+++ b/qga/meson.build
@@ -54,9 +54,27 @@ qga_ss.add(when: 'CONFIG_WIN32', if_true: files(
 
 qga_ss = qga_ss.apply(config_host, strict: false)
 
+qga_rs = declare_dependency()
+if with_rust
+  cargo_qga = custom_target('cargo-qga',
+                            build_by_default: true,
+                            output: ['libqga.args', 'libqga.a'],
+                            build_always_stale: true,
+                            command: [cargo_wrapper,
+                                      meson.current_build_dir(),
+                                      meson.current_source_dir(),
+                                      meson.build_root(),
+                                      rs_build_type,
+                                      rust_target_triple,
+                                      'build-lib'])
+  qga_rs = declare_dependency(
+    link_args: '@' + cargo_qga[0].full_path(),
+    sources: cargo_qga)
+endif
+
 qga = executable('qemu-ga', qga_ss.sources(),
                  link_args: config_host['LIBS_QGA'].split(),
-                 dependencies: [qemuutil, libudev],
+                 dependencies: [qemuutil, libudev, qga_rs],
                  install: true)
 all_qga = [qga]
 
-- 
2.33.0.113.g6c40894d24