Only symlink certain directories on Windows

src/lib.rs

@@ -746,13 +746,28 @@ fn symlink(original: &str, link: &Path) -> Result<(), Error> {
 }
 
 #[cfg(windows)]
-fn symlink(original: &str, link: &Path) -> Result<(), Error> {
-    if std::fs::metadata(original)?.is_dir() {
-        std::os::windows::fs::symlink_dir(original, link)
-    } else {
-        std::os::windows::fs::symlink_file(original, link)
+#[inline]
+fn symlink(_original: &str, _link: &Path) -> Result<(), Error> {
+    Ok(())
+}
+
+#[inline]
+fn symlink_on_windows_too(original: &str, link: &Path) -> Result<(), Error> {
+    #[cfg(unix)]
+    {
+        symlink(original, link)
+    }
+
+    #[cfg(windows)]
+    {
+        let full_path = link.parent().unwrap().join(original);
+        if full_path.is_dir() {
+            std::os::windows::fs::symlink_dir(original, link)
+                .with_context(|| format!("unable to symlink from {link} to {original}"))
+        } else {
+            Ok(())
+        }
     }
-    .with_context(|| format!("unable to symlink from {link} to {original}"))
 }
 
 #[cfg(test)]

src/splat.rs

@@ -677,7 +677,7 @@ pub(crate) fn splat(
                 // Multiple architectures both have a lib dir,
                 // but we only need to create this symlink once.
                 if !versioned_linkname.exists() {
-                    symlink(".", &versioned_linkname)?;
+                    crate::symlink_on_windows_too(".", &versioned_linkname)?;
                 }
 
                 // https://github.com/llvm/llvm-project/blob/release/14.x/clang/lib/Driver/ToolChains/MSVC.cpp#L1102
@@ -698,7 +698,7 @@ pub(crate) fn splat(
                 // Desktop and Store variants both have an include dir,
                 // but we only need to create this symlink once.
                 if !versioned_linkname.exists() {
-                    symlink(".", &versioned_linkname)?;
+                    crate::symlink_on_windows_too(".", &versioned_linkname)?;
                 }
 
                 // https://github.com/llvm/llvm-project/blob/release/14.x/clang/lib/Driver/ToolChains/MSVC.cpp#L1340-L1346