From 7d4d544001823db10493cc9c20efea91fcad55ad Mon Sep 17 00:00:00 2001
From: "William D. Jones" <thor0505@comcast.net>
Date: Thu, 15 May 2025 18:36:04 -0400
Subject: [PATCH] Strip trailing slashes when checking for directories on
 Windows.

---
 kernel/io.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/io.cc b/kernel/io.cc
index d5d2994b2..d7d126c4c 100644
--- a/kernel/io.cc
+++ b/kernel/io.cc
@@ -251,7 +251,15 @@ bool check_is_directory(const std::string& dirname)
 {
 #if defined(_WIN32)
 	struct _stat info;
-	if (_stat(dirname.c_str(), &info) != 0)
+	auto dirname_ = dirname;
+
+	/* On old versions of Visual Studio and current versions on MinGW,
+	   _stat will fail if the path ends with a trailing slash. */
+	if (dirname.back() == '/' || dirname.back() == '\\') {
+		dirname_ = dirname.substr(0, dirname.length() - 1);
+	}
+
+	if (_stat(dirname_.c_str(), &info) != 0)
 	{
 		return false;
 	}