rust no_std compiles

rust/Cargo.toml

@@ -2,6 +2,15 @@
 name = "rust"
 version = "0.1.0"
 authors = ["pln <Per Lindgren>"]
-edition = "2018"
+# edition = "2018"
 
 [dependencies]
+
+[profile.dev]
+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
+lto = true # better optimizations
\ No newline at end of file

rust/src/main.rs

 #![no_std]
+#![feature(compiler_builtins_lib)]
+#![feature(lang_items)]
+#![feature(core_intrinsics)]
+#![no_main]
 
-//use core::ptr::read;
+use core::intrinsics;
+use core::panic::PanicInfo;
 
-fn main() {
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    unsafe { intrinsics::abort() }
+}
+
+#[inline(never)]
+fn f1() -> u32 {
+    0
+}
 
+#[no_mangle]
+fn main() {
+    f1();
 }
+
+// cargo rustc --release -- -C linker=true --emit=llvm-ir,llvm-bc