From 27bbb696ba85fcef8c62abcd95c65e793e558a87 Mon Sep 17 00:00:00 2001
From: Joe Caulfield <joe.caulfield@anza.xyz>
Date: Thu, 4 Apr 2024 08:53:39 -0500
Subject: [PATCH] add frozen abi requirements

---
 Cargo.lock         |  6 ++++++
 program/Cargo.toml |  8 ++++++++
 program/build.rs   | 23 +++++++++++++++++++++++
 program/src/lib.rs |  3 +++
 4 files changed, 40 insertions(+)
 create mode 100644 program/build.rs

diff --git a/Cargo.lock b/Cargo.lock
index 0b2faf1..30a71f3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1340,6 +1340,12 @@ dependencies = [
 name = "solana-vote-program"
 version = "0.1.0"
 dependencies = [
+ "bincode",
+ "log",
+ "rustc_version",
+ "serde",
+ "solana-frozen-abi",
+ "solana-frozen-abi-macro",
  "solana-program",
 ]
 
diff --git a/program/Cargo.toml b/program/Cargo.toml
index a7d6a06..a081384 100644
--- a/program/Cargo.toml
+++ b/program/Cargo.toml
@@ -16,7 +16,15 @@ bpf-entrypoint = []
 test-sbf = []
 
 [dependencies]
+bincode = "1.3.3"
+log = "0.4.20"
+serde = { version = "1.0.193", features = ["derive"] }
+solana-frozen-abi-macro = "1.18.2"
+solana-frozen-abi = "1.18.2"
 solana-program = "1.18.2"
 
 [lib]
 crate-type = ["cdylib", "lib"]
+
+[build-dependencies]
+rustc_version = "0.4"
\ No newline at end of file
diff --git a/program/build.rs b/program/build.rs
new file mode 100644
index 0000000..929a639
--- /dev/null
+++ b/program/build.rs
@@ -0,0 +1,23 @@
+//! Required for `solana-frozen-abi-macro` to work.
+extern crate rustc_version;
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Copied and adapted from
+    // https://github.com/Kimundi/rustc-version-rs/blob/1d692a965f4e48a8cb72e82cda953107c0d22f47/README.md#example
+    // Licensed under Apache-2.0 + MIT
+    match version_meta().unwrap().channel {
+        Channel::Stable => {
+            println!("cargo:rustc-cfg=RUSTC_WITHOUT_SPECIALIZATION");
+        }
+        Channel::Beta => {
+            println!("cargo:rustc-cfg=RUSTC_WITHOUT_SPECIALIZATION");
+        }
+        Channel::Nightly => {
+            println!("cargo:rustc-cfg=RUSTC_WITH_SPECIALIZATION");
+        }
+        Channel::Dev => {
+            println!("cargo:rustc-cfg=RUSTC_WITH_SPECIALIZATION");
+        }
+    }
+}
diff --git a/program/src/lib.rs b/program/src/lib.rs
index 699746f..6e89513 100644
--- a/program/src/lib.rs
+++ b/program/src/lib.rs
@@ -1,4 +1,7 @@
 //! Vote Program.
+// [Core BPF]: Required for `solana-frozen-abi-macro` to work.
+#![allow(incomplete_features)]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
 
 #[cfg(all(target_os = "solana", feature = "bpf-entrypoint"))]
 mod entrypoint;