Remove restrictions on cross-compiling on Windows.

components/script/CMakeLists.txt

@@ -1,4 +1,4 @@
-project(script)
+project(script LANGUAGES)
 cmake_minimum_required(VERSION 2.6)
 
 set(DUMMY ${CMAKE_BUILD_TYPE})

components/script/build.rs

@@ -9,47 +9,12 @@ use std::fmt;
 use std::fs::File;
 use std::io::Write;
 use std::path::PathBuf;
-use std::process::Command;
 use std::str;
 use std::time::Instant;
 
 fn main() {
     let start = Instant::now();
 
-    let target = env::var("TARGET").unwrap();
-    let host = env::var("HOST").unwrap();
-    if target.contains("windows") && host != target {
-        assert_eq!(
-            host, "x86_64-pc-windows-msvc",
-            "Only cross-compiling from x64 is supported"
-        );
-        assert_eq!(
-            target, "i686-pc-windows-msvc",
-            "Only cross-compiling to x86 is supported"
-        );
-        assert!(env::var("VSINSTALLDIR").is_err());
-        // When cross-compiling on Windows, we need to ensure that the PATH is
-        // set up appropriately for the target before invoking make.
-        if env::var("VCVARSALL_PATH").is_err() {
-            panic!(
-                "Need to provide VCVARSALL_PATH value with path to \
-                 vcvarsall.bat from Visual Studio installation"
-            );
-        }
-
-        let vcvars = Command::new("vcvars.bat").output().unwrap();
-        assert!(vcvars.status.success());
-        let output = str::from_utf8(&vcvars.stdout).unwrap();
-        for line in output.lines() {
-            let mut parts = line.splitn(2, '=');
-            if let Some(name) = parts.next() {
-                if let Some(value) = parts.next() {
-                    env::set_var(name, value);
-                }
-            }
-        }
-    }
-
     // This must use the Ninja generator -- it's the only one that
     // parallelizes cmake's output properly.  (Cmake generates
     // separate makefiles, each of which try to build
@@ -61,19 +26,6 @@ fn main() {
         // We must use Ninja on Windows for this -- msbuild is painfully slow,
         // and ninja is easier to install than make.
         build.generator("Ninja");
-        // We have to explicitly specify the full path to link.exe,
-        // for reasons that I don't understand.  If we just give
-        // link.exe, it tries to use script-*/out/link.exe, which of
-        // course does not exist.
-        let link = std::process::Command::new("where")
-            .arg("link.exe")
-            .output()
-            .unwrap();
-        let link_path: Vec<&str> = std::str::from_utf8(&link.stdout)
-            .unwrap()
-            .split("\r\n")
-            .collect();
-        build.define("CMAKE_LINKER", link_path[0]);
     }
 
     build.build();

components/script/vcvars.bat

@@ -1,2 +0,0 @@
-call "%VCVARSALL_PATH%\vcvarsall.bat" x64_x86
-set