rusticl: add Test targets

v2: Add more targets and a little test lib to add stubs for missing symbols
v3: Condition building tests on a recent enough meson (@leftmostcat)
v4: Set suite parameter for new tests (@leftmostcat)

Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35188>

src/gallium/frontends/rusticl/meson.build

@@ -441,3 +441,30 @@ librusticl = static_library(
     rusticl_proc_macros,
   ],
 )
+
+if meson.version().version_compare('>= 1.9.0') and with_tests
+  # Tests may fail to build with versions of meson prior to 1.9 due to a bug
+  # involving parameters passed to the linker.
+  #
+  # See https://github.com/mesonbuild/meson/issues/14622
+  librusticl_test = static_library(
+    'rusticl_test',
+    'test/lib.rs',
+    rust_abi : 'c',
+  )
+
+  rust.test('rusticl_opencl_gen_test', rusticl_opencl_gen, suite : ['rusticl'])
+  rust.test('rusticl_llvm_gen_test', rusticl_llvm_gen, suite : ['rusticl'])
+  rust.test('rusticl_proc_macros_test', rusticl_proc_macros, suite : ['rusticl'])
+  rust.test('libc_rust_gen_test', libc_rust_gen, suite : ['rusticl'])
+  rust.test('libmesa_rust_gen_test', libmesa_rust_gen, suite : ['rusticl'])
+  rust.test('libmesa_rust_util_test', libmesa_rust_util, suite : ['rusticl'])
+  rust.test('libmesa_rust_test', libmesa_rust, suite : ['rusticl'])
+
+  rust.test('rusticl_test', librusticl,
+    link_with : [
+      librusticl_test,
+    ],
+    suite : ['rusticl'],
+  )
+endif

src/gallium/frontends/rusticl/test/lib.rs

@@ -0,0 +1,6 @@
+use std::ffi::{c_int, c_void};
+
+// it's never called anyway, but the linker _might_ think that. If this interface ever changes it
+// might cause random issues, but... I also don't really care all that much until it happens.
+#[no_mangle]
+extern "C" fn pipe_loader_release(_: *mut *mut c_void, _: c_int) {}