Add a windows manifest file

This avoids the need for compatibility shims, sets the code page to UTF-8 and enables long path awareness.

Author: ChrisDenton

Diff for: build.rs

@@ -7,6 +7,7 @@ use std::process::Command;
 fn main() {
     commit_info();
     compress_man();
+    windows_manifest();
     // ALLOWED: Accessing environment during build time shouldn't be prohibited.
     #[allow(clippy::disallowed_methods)]
     let target = std::env::var("TARGET").unwrap();
@@ -76,3 +77,26 @@ fn commit_info() {
     println!("cargo:rustc-env=CARGO_COMMIT_SHORT_HASH={}", next());
     println!("cargo:rustc-env=CARGO_COMMIT_DATE={}", next())
 }
+
+#[allow(clippy::disallowed_methods)]
+fn windows_manifest() {
+    use std::env;
+    let target_os = env::var("CARGO_CFG_TARGET_OS");
+    let target_env = env::var("CARGO_CFG_TARGET_ENV");
+    if Ok("windows") == target_os.as_deref() && Ok("msvc") == target_env.as_deref() {
+        static WINDOWS_MANIFEST_FILE: &str = "windows.manifest.xml";
+
+        let mut manifest = env::current_dir().unwrap();
+        manifest.push(WINDOWS_MANIFEST_FILE);
+
+        println!("cargo:rerun-if-changed={WINDOWS_MANIFEST_FILE}");
+        // Embed the Windows application manifest file.
+        println!("cargo:rustc-link-arg-bin=cargo=/MANIFEST:EMBED");
+        println!(
+            "cargo:rustc-link-arg-bin=cargo=/MANIFESTINPUT:{}",
+            manifest.to_str().unwrap()
+        );
+        // Turn linker warnings into errors.
+        println!("cargo:rustc-link-arg-bin=cargo=/WX");
+    }
+}

Diff for: windows.manifest.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!--
+This is a Windows application manifest file.
+See: https://docs.microsoft.com/en-us/windows/win32/sbscs/application-manifests
+-->
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+    <!-- Versions cargo supports as hosts -->
+    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1"> 
+        <application> 
+            <!-- Windows 7 --><supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+            <!-- Windows 8 --><supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+            <!-- Windows 8.1 --><supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+            <!-- Windows 10 and 11 --><supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+        </application> 
+    </compatibility>
+    <!-- Use UTF-8 code page -->
+    <asmv3:application>
+        <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">
+            <activeCodePage>UTF-8</activeCodePage>
+        </asmv3:windowsSettings>
+    </asmv3:application>
+    <!-- Remove (most) legacy path limits -->
+    <asmv3:application>
+        <asmv3:windowsSettings xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
+            <ws2:longPathAware>true</ws2:longPathAware>
+        </asmv3:windowsSettings>
+    </asmv3:application>
+</assembly>