libgcc_eh may depend on libpthread.

Make sure we link to the static libpthread, so that compiled Rust binaries do not depend on winpthread1.dll.

Author: vadimcn

src/libunwind/build.rs

@@ -35,7 +35,8 @@ fn main() {
     } else if target.contains("dragonfly") {
         println!("cargo:rustc-link-lib=gcc_pic");
     } else if target.contains("windows-gnu") {
-        println!("cargo:rustc-link-lib=gcc_eh");
+        println!("cargo:rustc-link-lib=static-nobundle=gcc_eh");
+        println!("cargo:rustc-link-lib=static-nobundle=pthread");
     } else if target.contains("fuchsia") {
         println!("cargo:rustc-link-lib=unwind");
     }

src/libunwind/lib.rs

@@ -17,6 +17,7 @@
 #![feature(cfg_target_vendor)]
 #![feature(staged_api)]
 #![feature(unwind_attributes)]
+#![feature(static_nobundle)]
 
 #![cfg_attr(not(target_env = "msvc"), feature(libc))]