From 3ba1632f8d8e4c5564de282ad359e33151956bb6 Mon Sep 17 00:00:00 2001
From: Johannes Cornelis Draaijer <johannes.draaijer@kiteshield.com>
Date: Wed, 3 Sep 2025 13:53:50 +0200
Subject: rtic-macros: forward attributes applied to app module

Instead of ignoring additional attributes applied to the app
module, we can forward them to the generated code.
---
 rtic-macros/src/codegen.rs          | 2 ++
 rtic-macros/src/syntax/ast.rs       | 5 ++++-
 rtic-macros/src/syntax/parse.rs     | 9 ++++++++-
 rtic-macros/src/syntax/parse/app.rs | 1 +
 4 files changed, 15 insertions(+), 2 deletions(-)

(limited to 'rtic-macros/src')

diff --git a/rtic-macros/src/codegen.rs b/rtic-macros/src/codegen.rs
index 060db6d..e0cd033 100644
--- a/rtic-macros/src/codegen.rs
+++ b/rtic-macros/src/codegen.rs
@@ -44,12 +44,14 @@ pub fn app(app: &App, analysis: &Analysis) -> TokenStream2 {
     let user_code = &app.user_code;
     let name = &app.name;
     let device = &app.args.device;
+    let attribute_metas = &app.attribute_metas;
 
     let rt_err = util::rt_err_ident();
     let async_limit = bindings::async_prio_limit(app, analysis);
 
     quote!(
         /// The RTIC application module
+        #(#[#attribute_metas])*
         pub mod #name {
             /// Always include the device crate which contains the vector table
             use #device as #rt_err;
diff --git a/rtic-macros/src/syntax/ast.rs b/rtic-macros/src/syntax/ast.rs
index ad73a89..44c1385 100644
--- a/rtic-macros/src/syntax/ast.rs
+++ b/rtic-macros/src/syntax/ast.rs
@@ -1,6 +1,6 @@
 //! Abstract Syntax Tree
 
-use syn::{Attribute, Expr, Ident, Item, ItemUse, Pat, PatType, Path, Stmt, Type};
+use syn::{Attribute, Expr, Ident, Item, ItemUse, Meta, Pat, PatType, Path, Stmt, Type};
 
 use crate::syntax::{backend::BackendArgs, Map};
 
@@ -11,6 +11,9 @@ pub struct App {
     /// The arguments to the `#[app]` attribute
     pub args: AppArgs,
 
+    /// All attributes applied to the `#[app]` module (meta only)
+    pub attribute_metas: Vec<Meta>,
+
     /// The name of the `const` item on which the `#[app]` attribute has been placed
     pub name: Ident,
 
diff --git a/rtic-macros/src/syntax/parse.rs b/rtic-macros/src/syntax/parse.rs
index aae8a50..ea7ff29 100644
--- a/rtic-macros/src/syntax/parse.rs
+++ b/rtic-macros/src/syntax/parse.rs
@@ -11,7 +11,7 @@ use syn::{
     braced,
     parse::{self, Parse, ParseStream, Parser},
     token::Brace,
-    Ident, Item, LitInt, Token,
+    Attribute, Ident, Item, LitInt, Meta, Token,
 };
 
 use crate::syntax::{
@@ -28,6 +28,7 @@ pub fn app(args: TokenStream2, input: TokenStream2) -> parse::Result<App> {
 }
 
 pub(crate) struct Input {
+    pub attribute_metas: Vec<Meta>,
     _mod_token: Token![mod],
     pub ident: Ident,
     _brace_token: Brace,
@@ -48,12 +49,18 @@ impl Parse for Input {
 
         let content;
 
+        let mut attributes = input.call(Attribute::parse_outer)?;
         let _mod_token = input.parse()?;
         let ident = input.parse()?;
         let _brace_token = braced!(content in input);
+        let inner_attributes = content.call(Attribute::parse_inner)?;
         let items = content.call(parse_items)?;
 
+        attributes.extend(inner_attributes);
+        let attribute_metas = attributes.into_iter().map(|a| a.meta).collect();
+
         Ok(Input {
+            attribute_metas,
             _mod_token,
             ident,
             _brace_token,
diff --git a/rtic-macros/src/syntax/parse/app.rs b/rtic-macros/src/syntax/parse/app.rs
index 469bcb8..50ef12b 100644
--- a/rtic-macros/src/syntax/parse/app.rs
+++ b/rtic-macros/src/syntax/parse/app.rs
@@ -531,6 +531,7 @@ impl App {
         }
 
         Ok(App {
+            attribute_metas: input.attribute_metas,
             args,
             name: input.ident,
             init,
-- 
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