working example with fixed flake

flake.nix

@@ -25,21 +25,25 @@
         espup
       ];
 
-      shellHook = ''
-        echo ">>> ESP32 DevShell (esp-hal only)"
+shellHook = ''
+  echo ">>> ESP32 DevShell (esp-hal only)"
 
-        if [ ! -d "$HOME/.espup" ]; then
-          echo "Running espup install..."
-          espup install
-        fi
+  if [ ! -d "$HOME/.espup" ]; then
+    echo "Running espup install..."
+    espup install
+  fi
 
-        # Activate Xtensa Rust toolchain
-        export RUSTUP_TOOLCHAIN=esp
-        export PATH=$HOME/.rustup/toolchains/esp/bin:$PATH
+  # Activate Xtensa Rust toolchain
+  export RUSTUP_TOOLCHAIN=esp
+  export PATH=$HOME/.rustup/toolchains/esp/bin:$PATH
 
-        echo "Xtensa Rust toolchain ready."
-        rustc --version
-      '';
+  # Add GCC/binutils path for xtensa-esp32-elf-gcc
+  export PATH=$HOME/.rustup/toolchains/esp/xtensa-esp-elf/esp-14.2.0_20240906/xtensa-esp-elf/bin:$PATH
+
+  echo "Xtensa Rust toolchain ready."
+  rustc --version
+  which xtensa-esp32-elf-gcc || echo "⚠️ xtensa-esp32-elf-gcc not found in PATH"
+'';
     };
   };
 }