Break out package_cfg construction

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/build.rs b/build.rs
index 2643bbfc061bc51436e8c7253cd4c4845b96afb3..299a2862384f89ec47b9d0156680fc58abe5537b 100644 (file)
--- a/build.rs
+++ b/build.rs
@@ -52,8 +52,9 @@ impl Context<'_> {
     for test in versions {
       let cfg = test.replace('.', "_").replace(">=", "ge_");
       let test: semver::VersionReq = test.parse().unwrap();
+      let cfg = format!("{package}_{cfg}");
       if test.matches(&pkg) {
-        println!("cargo:rustc-cfg={package}_{cfg}");
+        println!("cargo:rustc-cfg={cfg}");
       }
     }
   }