From e58eabc5d3c6652f25a937954373186c9cb11d6e Mon Sep 17 00:00:00 2001
From: Jeff <jeffdav@users.noreply.github.com>
Date: Fri, 4 Apr 2025 14:38:07 -0700
Subject: [PATCH] Use dlerror() when dlopen() fails.

---
 PythonKit/PythonLibrary.swift | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/PythonKit/PythonLibrary.swift b/PythonKit/PythonLibrary.swift
index 6149478..ab94a3f 100644
--- a/PythonKit/PythonLibrary.swift
+++ b/PythonKit/PythonLibrary.swift
@@ -205,6 +205,13 @@ extension PythonLibrary {
         // Must be RTLD_GLOBAL because subsequent .so files from the imported python
         // modules may depend on this .so file.
         let pythonLibraryHandle = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)
+        if pythonLibraryHandle == nil {
+            self.log("Failed to load library at '\(path)'.")
+            if let errorCString = dlerror() {
+                let errorString = String(cString: errorCString)
+                self.log("Reason for failure: \(errorString)")
+            }
+        }
 #endif
 
         if pythonLibraryHandle != nil {