rust no_std no debug

rust/Cargo.toml

@@ -12,5 +12,5 @@ panic = "abort"
 [profile.release]
 panic = "abort"
 codegen-units = 1 # better optimizations
-debug = true # symbols are nice and they don't increase the size on Flash
+# debug = true # symbols are nice and they don't increase the size on Flash
 lto = true # better optimizations
\ No newline at end of file

rust/src/main.rs

@@ -6,6 +6,7 @@
 
 use core::intrinsics;
 use core::panic::PanicInfo;
+use core::ptr;
 
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
@@ -14,7 +15,7 @@ fn panic(_info: &PanicInfo) -> ! {
 
 #[inline(never)]
 fn f1() -> u32 {
-    0
+    unsafe { ptr::read_volatile(&0) }
 }
 
 #[no_mangle]