empty build.rs

Cargo.lock

@@ -630,6 +630,7 @@ dependencies = [
  "once_cell",
  "pin-project",
  "pretty_env_logger",
+ "rustc_version",
  "serde",
  "serde_cbor",
  "smallmap",

Cargo.toml

@@ -67,3 +67,6 @@ smallmap = "1.1.5"
 lazy_static = "1.4.0"
 once_cell = "1.4.1"
 bzip2-sys = {version = "0.1.9", optional = true}
+
+[build-dependencies]
+rustc_version = "0.2"

build.rs

@@ -0,0 +1,26 @@
+
+extern crate rustc_version;
+use rustc_version::{version, version_meta, Channel};
+
+fn main() {
+    // Assert we haven't travelled back in time
+    assert!(version().unwrap().major >= 1);
+
+    // Set cfg flags depending on release channel
+    match version_meta().unwrap().channel {
+        Channel::Stable => {
+            println!("cargo:rustc-cfg=stable");
+        }
+        Channel::Beta => {
+            println!("cargo:rustc-cfg=beta");
+        }
+        Channel::Nightly => {
+            println!("cargo:rustc-cfg=nightly");
+        }
+        Channel::Dev => {
+            println!("cargo:rustc-cfg=dev");
+        }
+    }
+
+    //println!("cargo:rustc-link-lib=static=bz2"); // TODO: Make this conditional for `compress-chain`
+}