Multi rust projects (#4362)

programs/bpf/rust/iter/src/lib.rs

@@ -0,0 +1,23 @@
+//! @brief Example Rust-based BPF program that prints out the parameters passed to it
+
+#![no_std]
+
+extern crate solana_sdk_bpf_utils;
+
+use solana_sdk_bpf_utils::*;
+
+#[no_mangle]
+pub extern "C" fn entrypoint(_input: *mut u8) -> bool {
+    const ITERS: usize = 100;
+    let ones = [1_u64; ITERS];
+    let mut sum: u64 = 0;
+
+    for v in ones.iter() {
+        sum += *v;
+    }
+    sol_log_64(0xff, 0, 0, 0, sum);
+    assert_eq!(sum, ITERS as u64);
+
+    sol_log("Success");
+    true
+}