Multi rust projects (#4362)

programs/bpf/rust/iter/.gitignore

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+/target/
+
+Cargo.lock

programs/bpf/rust/iter/Cargo.toml

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+
+# Note: This crate must be built using build.sh
+
+[package]
+name = "solana-bpf-rust-iter"
+version = "0.15.0"
+description = "Solana BPF iter program written in Rust"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+solana-sdk-bpf-utils = { path = "../../../../sdk/bpf/rust-utils", version = "0.15.0" }
+
+[workspace]
+members = []
+
+[lib]
+name = "solana_bpf_rust_iter"
+crate-type = ["cdylib"]

programs/bpf/rust/iter/Xargo.toml

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+
+
+[dependencies.compiler_builtins]
+path = "../../../../sdk/bpf/rust-bpf-sysroot/src/compiler-builtins"
+
+[target.bpfel-unknown-unknown.dependencies]
+alloc = { path = "../../../../sdk/bpf/rust-bpf-sysroot/src/liballoc" }

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

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+//! @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
+}