[PATCH v2] scripts: generate_rust_analyzer.py: add missing macros deps

[Tamir Duberstein <tamird@gmail.com>]

The macros crate has depended on std and proc_macro since its
introduction in commit 1fbde52bde73 ("rust: add `macros` crate"). These
dependencies were omitted from commit 8c4555ccc55c ("scripts: add
`generate_rust_analyzer.py`") resulting in missing go-to-definition and
autocomplete, and false-positive warnings emitted from rust-analyzer
such as:

  [{
  	"resource": "/Users/tamird/src/linux/rust/macros/module.rs",
  	"owner": "_generated_diagnostic_collection_name_#1",
  	"code": {
  		"value": "non_snake_case",
  		"target": {
  			"$mid": 1,
  			"path": "/rustc/",
  			"scheme": "https",
  			"authority": "doc.rust-lang.org",
  			"query": "search=non_snake_case"
  		}
  	},
  	"severity": 4,
  	"message": "Variable `None` should have snake_case name, e.g. `none`",
  	"source": "rust-analyzer",
  	"startLineNumber": 123,
  	"startColumn": 17,
  	"endLineNumber": 123,
  	"endColumn": 21
  }]

Add the missing dependencies to improve the developer experience.

Fixes: 8c4555ccc55c ("scripts: add `generate_rust_analyzer.py`")
Suggested-by: Chayim Refael Friedman <chayimfr@gmail.com>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
Changes in v2:
- Change macros deps from [core] to [std, proc_macro], improving
  autocomplete and go-to-definition.
- Remove Wedson Almeida Filho <wedsonaf@google.com> from cc; email
  bounced.
- Link to v1: https://lore.kernel.org/r/20250209-rust-analyzer-macros-core-dep-v1-1-5ebeb3eb60a9@gmail.com
---
 scripts/generate_rust_analyzer.py | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index aa8ea1a4dbe5..316174c22346 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -57,25 +57,33 @@ def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs):
         crates_indexes[display_name] = len(crates)
         crates.append(crate)
 
-    # First, the ones in `rust/` since they are a bit special.
-    append_crate(
-        "core",
-        sysroot_src / "core" / "src" / "lib.rs",
-        [],
-        cfg=crates_cfgs.get("core", []),
-        is_workspace_member=False,
-    )
-
     append_crate(
         "compiler_builtins",
         srctree / "rust" / "compiler_builtins.rs",
         [],
     )
 
+    # NB: sysroot crates reexport items from one another so setting up our transitive dependencies
+    # here is important for ensuring that rust-analyzer can resolve symbols. The sources of truth
+    # for this dependency graph are `(sysroot_src / crate / "Cargo.toml" for crate in crates)`.
+    for crate, deps in [
+        ("core", []),
+        ("alloc", ["compiler_builtins", "core"]),
+        ("std", ["alloc", "compiler_builtins", "core"]),
+        ("proc_macro", ["core", "std"]),
+    ]:
+        append_crate(
+            crate,
+            sysroot_src / crate / "src" / "lib.rs",
+            deps=deps,
+            cfg=crates_cfgs.get(crate, []),
+            is_workspace_member=False,
+        )
+
     append_crate(
         "macros",
         srctree / "rust" / "macros" / "lib.rs",
-        [],
+        ["std", "proc_macro"],
         is_proc_macro=True,
     )
 

---
base-commit: 6273a058383e05465083b535ed9469f2c8a48321
change-id: 20250209-rust-analyzer-macros-core-dep-0f57868dd19f

Best regards,
-- 
Tamir Duberstein <tamird@gmail.com>