Native MSVC windows build, convert to cmake

components/script/build.rs

@@ -2,17 +2,36 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+extern crate cmake;
 use std::env;
-use std::process::Command;
 use std::time::Instant;
 
 fn main() {
     let start = Instant::now();
-    let num_jobs = env::var("NUM_JOBS").unwrap();
-    assert!(Command::new("make")
-        .args(&["-f", "makefile.cargo", "-j", &num_jobs])
-        .status()
-        .unwrap()
-        .success());
+
+    // 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
+    // ParserResults.pkl, and then stomp on eachother.)
+    let mut build = cmake::Config::new(".");
+
+    let target = env::var("TARGET").unwrap();
+    if target.contains("windows-msvc") {
+        // We must use Ninja on Windows for this -- msbuild is painfully slow,
+        // and ninja is easier to install than make.
+        build.generator("Ninja");
+        // because we're using ninja, we need to explicitly set these
+        // to VC++, otherwise it'll try to use cc
+        build.define("CMAKE_C_COMPILER", "cl.exe")
+             .define("CMAKE_CXX_COMPILER", "cl.exe");
+        // 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.
+        build.define("CMAKE_LINKER", "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\bin\\amd64\\link.exe");
+    }
+
+    build.build();
+
     println!("Binding generation completed in {}s", start.elapsed().as_secs());
 }