From d0641da8c7f27dfca5b0ae3bc7c737c7859e3939 Mon Sep 17 00:00:00 2001
From: Lujin Wang <143145775+lujinwangnv@users.noreply.github.com>
Date: Fri, 10 Oct 2025 17:51:58 -0700
Subject: Update build to allow setting external mimalloc path (#8676)

Update the build to allow setting user-specific path for the external
module mimalloc.
---
 CMakeLists.txt          | 5 +++++
 external/CMakeLists.txt | 8 ++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc22e75f9..265266da5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -270,6 +270,11 @@ advanced_option(
     "Build using user defined path for lua"
     OFF
 )
+advanced_option(
+    SLANG_OVERRIDE_MIMALLOC_PATH
+    "Build using user defined path for mimalloc"
+    OFF
+)
 
 advanced_option(
     SLANG_EXCLUDE_DAWN
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index 6b8b5a527..12d5490c7 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -152,8 +152,12 @@ if(SLANG_ENABLE_SLANG_GLSLANG)
         # Enable mimalloc for SPIRV-Tools to improve compilation performance
         # Based on SPIRV-Tools PR #6267: https://github.com/KhronosGroup/SPIRV-Tools/pull/6267
         if(SLANG_ENABLE_SPIRV_TOOLS_MIMALLOC)
-            # Place mimalloc in slang/external instead of spirv-tools/external for better organization
-            set(MIMALLOC_PATH "${CMAKE_CURRENT_SOURCE_DIR}/mimalloc")
+            if(NOT SLANG_OVERRIDE_MIMALLOC_PATH)
+                # Place mimalloc in slang/external instead of spirv-tools/external for better organization
+                set(MIMALLOC_PATH "${CMAKE_CURRENT_SOURCE_DIR}/mimalloc")
+            else()
+                set(MIMALLOC_PATH "${SLANG_OVERRIDE_MIMALLOC_PATH}/mimalloc")
+            endif()
 
             # Download mimalloc if it's not available
             if(NOT EXISTS "${MIMALLOC_PATH}/CMakeLists.txt")
-- 
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