[PATCH v3] rust-analyzer: update generate_rust_analyzer to pass cfg to macros crate

[Malte Wechter <maltewechter@gmail.com>]

The configuration passed to rust-analyzer for the `macros` create is
different from the configuration used to build the crate. Update
rust-analyzer configuration for the `macros` crate to reflect the
settings used to compile the crate. Without this change, rust-analyzer
does not understand conditional compilation gated by configuration
redicates based on the `CONFIG_*`configuration values in the macros
crate.

Fixes: 36174d16f3ec ("rust: kunit: support KUnit-mapped `assert!` macros in `#[test]`s")
Signed-off-by: Malte Wechter <maltewechter@gmail.com>
---
We are currently moving the 'configfs_attrs' macro to a procedual implementation,
with this we wanted to gate the macro on CONFIG_CONFIGFS_FS, since the macros crate is
build with these configurations since 36174d16 ("rust: kunit: support KUnit-mapped `assert!` macros in `#[test]`s").
It compiles but rust-analyzer does not reflect this as adding:
 
    #[cfg(CONFIG_CONFIGFS_FS)]
    mod configfs_attrs;

will _never_ mark configfs_attrs module as included since the cfg's are not passed to
the macros crate.
---
Changes in v3:
- Add fixes tag
- Link to v2: https://lore.kernel.org/r/20260520-rust-analyzer-macro-v2-1-bcf5bdeca1a1@gmail.com

Changes in v2:
- Update commit message
- Link to v1: https://lore.kernel.org/r/20260508-rust-analyzer-macro-v1-1-9122b940d003@gmail.com
---
 scripts/generate_rust_analyzer.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
index d5f9a0ca742c..69990a96522e 100755
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py
@@ -238,6 +238,7 @@ def generate_crates(
         "macros",
         srctree / "rust" / "macros" / "lib.rs",
         [std, proc_macro, proc_macro2, quote, syn],
+        cfg=generated_cfg,
     )
 
     build_error = append_crate(

---
base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
change-id: 20260506-rust-analyzer-macro-22f387f8eff4

Best regards,
-- 
Malte Wechter <maltewechter@gmail.com>