Remove bloat due to test symbols (#5965)

sdk/bpf/rust/test/.gitignore

@@ -0,0 +1,3 @@
+/target/
+/farf/
+Cargo.lock

sdk/bpf/rust/test/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "solana-sdk-bpf-test"
+version = "0.19.0-pre0"
+description = "Solana BPF SDK test utilities"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[workspace]
+members = []

sdk/bpf/rust/test/src/lib.rs

@@ -0,0 +1,25 @@
+//! @brief Solana Rust-based BPF program utility functions and types
+
+#[no_mangle]
+pub unsafe fn sol_log_(message: *const u8, length: u64) {
+    let slice = std::slice::from_raw_parts(message, length as usize);
+    let string = std::str::from_utf8(&slice).unwrap();
+    std::println!("{}", string);
+}
+
+#[no_mangle]
+pub fn sol_log_64_(arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) {
+    std::println!("{} {} {} {} {}", arg1, arg2, arg3, arg4, arg5);
+}
+
+#[macro_export]
+macro_rules! stubs {
+    () => {
+        #[test]
+        fn pull_in_externs() {
+            use $crate::*;
+            unsafe { sol_log_("sol_log_".as_ptr(), 8) };
+            sol_log_64_(1, 2, 3, 4, 5);
+        }
+    };
+}