Update upstream source from tag 'upstream/1.52.1+dfsg1'

[rustc.git] / vendor / rustversion / build / build.rs

diff --git a/vendor/rustversion/build/build.rs b/vendor/rustversion/build/build.rs
new file mode 100644 (file)
index 0000000..2a8bc4a
--- /dev/null
+++ b/vendor/rustversion/build/build.rs
@@ -0,0 +1,47 @@
+mod rustc;
+
+use std::env;
+use std::ffi::OsString;
+use std::fs;
+use std::path::Path;
+use std::process::{self, Command};
+
+fn main() {
+    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
+    let output = match Command::new(&rustc).arg("--version").output() {
+        Ok(output) => output,
+        Err(e) => {
+            let rustc = rustc.to_string_lossy();
+            eprintln!("Error: failed to run `{} --version`: {}", rustc, e);
+            process::exit(1);
+        }
+    };
+
+    let string = match String::from_utf8(output.stdout) {
+        Ok(string) => string,
+        Err(e) => {
+            let rustc = rustc.to_string_lossy();
+            eprintln!(
+                "Error: failed to parse output of `{} --version`: {}",
+                rustc, e,
+            );
+            process::exit(1);
+        }
+    };
+
+    let version = match rustc::parse(&string) {
+        Some(version) => format!("{:#?}\n", version),
+        None => {
+            eprintln!(
+                "Error: unexpected output from `rustc --version`: {:?}\n\n\
+                 Please file an issue in https://github.com/dtolnay/rustversion",
+                string
+            );
+            process::exit(1);
+        }
+    };
+
+    let out_dir = env::var_os("OUT_DIR").expect("OUT_DIR not set");
+    let out_file = Path::new(&out_dir).join("version.rs");
+    fs::write(out_file, version).expect("failed to write version.rs");
+}