Add simple proc-macro loading test case (osx only)

commit-id:e457ae12

Cargo.toml

@@ -14,6 +14,9 @@ members = [
     "utils/test-for-each-example",
     "xtask",
 ]
+exclude = [
+    "scarb/fixtures/proc-macro-stub"
+]
 "resolver" = "2"
 
 [workspace.package]

scarb/fixtures/proc-macro-stub/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "proc-macro-stub"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type   = ["rlib", "cdylib"]
+
+[dependencies]
+scarb-proc-macro-interface = { path = "../../../utils/scarb-proc-macro-interface"}
+
+[workspace]

scarb/fixtures/proc-macro-stub/Scarb.toml

@@ -0,0 +1,6 @@
+[package]
+name = "proc_macro_stub"
+version = "0.1.0"
+edition = "2023_11"
+
+[cairo-plugin]

scarb/fixtures/proc-macro-stub/src/lib.rs

@@ -0,0 +1,11 @@
+use scarb_proc_macro_interface::shared::{FfiProcMacroResult, FfiTokenStream};
+
+/// Proc macro stub.
+///
+/// # Safety
+/// Note that token stream deserialization may fail.
+#[no_mangle]
+pub unsafe extern "C" fn expand(token_stream: FfiTokenStream) -> FfiProcMacroResult {
+    let _code = unsafe { token_stream.to_string() };
+    FfiProcMacroResult::Leave
+}

scarb/src/compiler/plugin/proc_macro/ffi.rs

@@ -83,7 +83,7 @@ impl Debug for ProcMacroInstance {
 }
 
 fn shared_lib_path(package: &Package) -> Utf8PathBuf {
-    let lib_name = format!("{}.dylib", package.id.name);
+    let lib_name = format!("lib{}.dylib", package.id.name);
     package.root().join("target").join("release").join(lib_name)
 }
 

scarb/tests/proc_macro.rs

@@ -0,0 +1,24 @@
+use assert_fs::TempDir;
+use scarb_test_support::command::Scarb;
+use scarb_test_support::project_builder::{Dep, DepBuilder, ProjectBuilder};
+use std::path::PathBuf;
+
+#[test]
+fn compile_simple() {
+    let proc_macro_stub_path =
+        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("fixtures/proc-macro-stub/");
+    let t = TempDir::new().unwrap();
+    ProjectBuilder::start()
+        .name("hello")
+        .dep(
+            "proc_macro_stub",
+            Dep.path(proc_macro_stub_path.as_path().to_string_lossy().to_string()),
+        )
+        .build(&t);
+
+    Scarb::quick_snapbox()
+        .arg("build")
+        .current_dir(&t)
+        .assert()
+        .success();
+}