Add features for guarding code based on the P23. (#1863)

cmd/soroban-cli/Cargo.toml

@@ -36,6 +36,8 @@ doctest = false
 
 [features]
 default = []
+version_lt_23 = []
+version_gte_23 = []
 opt = ["dep:wasm-opt"]
 
 [dependencies]

cmd/soroban-cli/build.rs

@@ -1,3 +1,22 @@
 fn main() {
     crate_git_revision::init();
+    set_protocol_features();
+}
+
+fn set_protocol_features() {
+    let version = env!("CARGO_PKG_VERSION");
+    let major_version: u32 = version
+        .split('.')
+        .next()
+        .unwrap_or("0")
+        .parse()
+        .unwrap_or(0);
+
+    if major_version < 23 {
+        println!("cargo:rustc-cfg=feature=\"version_lt_23\"");
+    }
+
+    if major_version >= 23 {
+        println!("cargo:rustc-cfg=feature=\"version_gte_23\"");
+    }
 }