Moved the system lib check not to prevent taking the static linking branch.

Author: golddranks

src/lib.rs

@@ -430,18 +430,25 @@ impl Library {
                 }
                 "-l" => {
                     self.libs.push(val.to_string());
-                    if statik && !is_system(val, &dirs) {
-                        let meta = format!("rustc-link-lib=static={}", val);
-                        config.print_metadata(&meta);
-                    } else {
-                        let meta = format!("rustc-link-lib={}", val);
-                        config.print_metadata(&meta);
-                    }
                 }
                 _ => {}
             }
         }
 
+        for val in &self.libs {
+            if statik {
+                if is_system(val, &dirs) {
+                        panic!("The library \"{}\" is a system library, \
+                            which means it can't be linked statically!", val);
+                    }
+                    let meta = format!("rustc-link-lib=static={}", val);
+                    config.print_metadata(&meta);
+                } else {
+                    let meta = format!("rustc-link-lib={}", val);
+                    config.print_metadata(&meta);
+                }
+        }
+
         let mut iter = output.trim_right().split(' ');
         while let Some(part) = iter.next() {
             if part != "-framework" {