Fix static linking

Author: millucas

CHANGELOG.md

@@ -1,3 +1,8 @@
+## [0.20.1] - UNRELEASED
+
+### Fixed
+- Fixed static linking
+
 ## [0.20.0] - 2017-09-14
 
 ### Added

build.rs

@@ -318,7 +318,7 @@ fn link_static() {
 
     // Determine the shared mode used by LLVM.
     let mode = run_llvm_config(&["--shared-mode"]).map(|m| m.trim().to_owned());
-    let prefix = if mode.ok().map_or(false, |m| m == "static") { "static" } else { "" };
+    let prefix = if mode.ok().map_or(false, |m| m == "static") { "static=" } else { "" };
 
     // Specify required LLVM static libraries.
     println!("cargo:rustc-link-search=native={}", run_llvm_config(&["--libdir"]).unwrap().trim_right());