From 8a430d6495b889f2be9708a4e91d1d3c1cfe1399 Mon Sep 17 00:00:00 2001
From: itsjunetime <junewelker@gmail.com>
Date: Thu, 25 Jun 2026 16:41:26 -0500
Subject: [PATCH] Use /MDd flag to compile in debug mode if cargo is in debug
 mode

---
 libmimalloc-sys/build.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libmimalloc-sys/build.rs b/libmimalloc-sys/build.rs
index 0f3fcda..cae1f77 100644
--- a/libmimalloc-sys/build.rs
+++ b/libmimalloc-sys/build.rs
@@ -51,6 +51,10 @@ fn main() {
         build.std("c++17");
         build.flag_if_supported("/Zc:__cplusplus");
 
+        if cargo_debug {
+            build.flag("/MDd");
+        }
+
         let wrapper =
             PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR not set")).join("mimalloc-static.cc");
         let include = static_source.to_string_lossy().replace('\\', "/");