Add support for running on Windows

.github/workflows/main.yml

@@ -5,20 +5,24 @@ on:
     branches:
       - main
       - "[0-9].x"
+      - windows-support
 
 name: Continuous integration
 
 jobs:
   ci:
     env:
-      RUSTFLAGS: ${{ matrix.rust == 'nightly' && '-Z sanitizer=leak' || '' }}
-    runs-on: ubuntu-latest
+      RUSTFLAGS: ${{ matrix.rust == 'nightly' && matrix.os == 'ubuntu-latest' && '-Z sanitizer=leak' || '' }}
     strategy:
       fail-fast: false
       matrix:
         rust:
           - stable
           - nightly
+        os:
+          - ubuntu-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v2

build.rs

@@ -15,6 +15,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let makefile_path = build_path.join("Makefile");
     let out_header_path = out_dir.join(LIBRARY_NAME).with_extension("h");
     let out_protobuf_path = out_dir.join("protobuf");
+    let target = env::var("TARGET").unwrap();
 
     // Configure cargo through stdout
     println!("cargo:rerun-if-changed={}", makefile_path.display()); // Includes version number
@@ -37,10 +38,16 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Compile the C library.
     let mut make = Command::new("make");
 
-    make.env_remove("PROFILE").arg("-C").arg(&out_dir).arg("build");
+    if target.contains("msvc") {
+        make = Command::new("nmake");
+        make.arg("/F Makefile.msvc");
+        make.current_dir(&out_dir);
+    } else {
+        make.env_remove("PROFILE").arg("-C").arg(&out_dir).arg("build");
 
-    if env::var("PROFILE").unwrap() == "debug" {
-        make.arg("DEBUG=1");
+        if env::var("PROFILE").unwrap() == "debug" {
+            make.arg("DEBUG=1");
+        }
     }
 
     let status = make.stdin(Stdio::null()).stdout(Stdio::inherit()).stderr(Stdio::inherit()).status()?;