ci: Check at least one C3 target

.github/workflows/build.yml

@@ -34,7 +34,6 @@ jobs:
         run:  cargo xtask --verbose fmt -c
 
   # Compilation check
-  # TODO: check esp32-c3
   check:
     name: check
     runs-on: ubuntu-22.04
@@ -64,6 +63,10 @@ jobs:
           - backend: riscv32-imc-mecall
             platform: hifive1
             rustup-target: riscv32imc-unknown-none-elf
+
+          - backend: riscv-esp32-c3
+            platform: esp32-c3
+            rustup-target: riscv32imc-unknown-none-elf
     steps:
       - name: Checkout
         uses: actions/checkout@v4

xtask/src/argument_parsing.rs

@@ -138,7 +138,7 @@ impl TestMetadata {
     }
 }
 
-#[derive(clap::ValueEnum, Copy, Clone, Default, Debug)]
+#[derive(clap::ValueEnum, Copy, Clone, Default, Debug, PartialEq)]
 pub enum Backends {
     Thumbv6,
     #[default]
@@ -193,7 +193,9 @@ impl Backends {
 
     #[allow(clippy::wrong_self_convention)]
     pub fn to_rtic_monotonics_features(&self, partial: bool) -> Option<&[&str]> {
-        if !self.is_arm() {
+        if self == &Self::RiscvEsp32C3 {
+            Some(&["esp32c3-systimer"])
+        } else if !self.is_arm() {
             None
         } else if partial {
             Some(&[