cksum: improve linkage test for more targets

.github/workflows/CICD.yml

@@ -919,11 +919,6 @@ jobs:
       shell: bash
       run: |
         cargo build --no-default-features --features "${{ matrix.job.features }}"
-        if ldd target/debug/coreutils 2>&1 | grep -iE 'libssl|libcrypto'; then
-          echo "ERROR: coreutils dynamically links libssl/libcrypto despite vendored feature"
-          exit 1
-        fi
-        echo "OK: no dynamic libssl/libcrypto linkage"
     # Second linking mode: OPENSSL_NO_VENDOR=1 links dynamically against
     # the system libcrypto/libssl.
     - name: Test checksum utilities with OpenSSL (system / dynamic)

tests/by-util/test_cksum.rs

@@ -42,6 +42,22 @@ fn sha_fixture_name(algo: &str, len: u32, prefix: &str, suffix: &str) -> String
     }
 }
 
+#[test]
+#[cfg(feature = "openssl")]
+fn test_openssl_link() {
+    let Ok(out) = std::process::Command::new("ldd")
+        .arg(uutests::util::get_tests_binary())
+        .output()
+    else {
+        return; // missing ldd
+    };
+    let dynamic = String::from_utf8_lossy(&out.stdout).contains("crypto"); // covering MSYS/MinGW too
+    assert_eq!(
+        std::env::var("OPENSSL_NO_VENDOR") == Ok("1".to_string()),
+        dynamic
+    );
+}
+
 #[test]
 fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails_with_code(1);