rust: proc-macro should be ignored in transitive dependencies

Fixes: #12459

4 files changed, 40 insertions, 1 deletions

diff --git a/test cases/rust/20 transitive dependencies/foo.c b/test cases/rust/20 transitive dependencies/foo.c
new file mode 100644
index 0000000..e40878a
--- /dev/null
+++ b/test cases/rust/20 transitive dependencies/foo.c
@@ -0,0 +1,8 @@
+#include <stdint.h>
+
+uint32_t foo_rs(void);
+
+int main(void)
+{
+    return foo_rs() == 42 ? 0 : 1;
+}
diff --git a/test cases/rust/20 transitive dependencies/foo.rs b/test cases/rust/20 transitive dependencies/foo.rs
new file mode 100644
index 0000000..8e38638
--- /dev/null
+++ b/test cases/rust/20 transitive dependencies/foo.rs
@@ -0,0 +1,9 @@
+extern crate pm;
+use pm::make_answer;
+
+make_answer!();
+
+#[no_mangle]
+pub fn foo_rs() -> u32 {
+    answer()
+}
diff --git a/test cases/rust/20 transitive dependencies/meson.build b/test cases/rust/20 transitive dependencies/meson.build
index 2f378f8..e5354b8 100644
--- a/test cases/rust/20 transitive dependencies/meson.build
+++ b/test cases/rust/20 transitive dependencies/meson.build
@@ -1,4 +1,4 @@
-project('transitive dependencies', 'rust',
+project('transitive dependencies', 'rust', 'c',
   version : '1.0.0',
   meson_version : '>= 1.0.0',
   default_options : ['rust_std=2018'],
@@ -10,3 +10,18 @@ subdir('libb')
 main = executable('main', 'main.rs',
   dependencies : [libb_dep],
 )
+
+# Since foo-rs is a static library, its dependencies are normally added to
+# footest link command. However, since pm is a proc-macro, footest should not
+# link with it. In native build this is an harmless overlinking, but in cross
+# building foo and pm are for different arch and it would fail to link.
+rust = import('rust')
+pm = rust.proc_macro('pm', 'proc.rs')
+foo = static_library('foo-rs', 'foo.rs',
+  rust_abi: 'c',
+  link_with: pm,
+)
+exe = executable('footest', 'foo.c',
+  link_with: foo,
+)
+test('footest', exe)
diff --git a/test cases/rust/20 transitive dependencies/proc.rs b/test cases/rust/20 transitive dependencies/proc.rs
new file mode 100644
index 0000000..53935e4
--- /dev/null
+++ b/test cases/rust/20 transitive dependencies/proc.rs
@@ -0,0 +1,7 @@
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn make_answer(_item: TokenStream) -> TokenStream {
+    "fn answer() -> u32 { 42 }".parse().unwrap()
+}