Upgrade rust/crates/async-trait to 0.1.48
Test: make
Change-Id: I898f35cd086b1bd9952eba11d5d59d31f78a5d16
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..a2b0833
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,25 @@
+use std::env;
+use std::process::Command;
+use std::str;
+
+fn main() {
+ let compiler = match rustc_minor_version() {
+ Some(compiler) => compiler,
+ None => return,
+ };
+
+ if compiler < 47 {
+ println!("cargo:rustc-cfg=self_span_hack");
+ }
+}
+
+fn rustc_minor_version() -> Option<u32> {
+ let rustc = env::var_os("RUSTC")?;
+ let output = Command::new(rustc).arg("--version").output().ok()?;
+ let version = str::from_utf8(&output.stdout).ok()?;
+ let mut pieces = version.split('.');
+ if pieces.next() != Some("rustc 1") {
+ return None;
+ }
+ pieces.next()?.parse().ok()
+}