From af578a4dd46e397d87779668b31621ea0fd6dece Mon Sep 17 00:00:00 2001
From: Schrodinger ZHU Yifan <i@zhuyi.fan>
Date: Thu, 29 Jan 2026 09:52:39 -0500
Subject: [PATCH 1/3] ci: experiment with new mingw clang64

---
 .github/workflows/mingw.yml | 54 +++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 .github/workflows/mingw.yml

diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
new file mode 100644
index 000000000..e2f0ac29b
--- /dev/null
+++ b/.github/workflows/mingw.yml
@@ -0,0 +1,54 @@
+name: MinGW Clang64 Full Pipeline
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        profile: [RelWithDebInfo, Debug]
+
+    name: MinGW Clang64 Build (${{ matrix.profile }})
+    runs-on: windows-2025
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+
+      - name: Setup MSYS2
+        id: msys2
+        uses: msys2/setup-msys2@v2
+        with:
+          msystem: clang64
+          update: true
+          install: >-
+            git
+            mingw-w64-clang-x86_64-toolchain
+            mingw-w64-clang-x86_64-cmake
+            mingw-w64-clang-x86_64-ninja
+
+      - name: Configure
+        run: >
+          cmake -GNinja
+          -B${{github.workspace}}/build
+          -DCMAKE_BUILD_TYPE=${{ matrix.profile }}
+          -DCMAKE_CXX_COMPILER=clang++
+          -DCMAKE_C_COMPILER=clang
+
+      - name: Build
+        run: >
+          cmake 
+          --build ${{github.workspace}}/build
+          --parallel
+      
+      - name: Test
+        run: >
+          cd ${{github.workspace}}/build
+          ctest
+        

From 14f61ba76ea416e745329c6cbb39ab3c1412752b Mon Sep 17 00:00:00 2001
From: Schrodinger ZHU Yifan <i@zhuyi.fan>
Date: Thu, 29 Jan 2026 10:02:39 -0500
Subject: [PATCH 2/3] fix

---
 .github/workflows/mingw.yml | 2 +-
 CMakeLists.txt              | 8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
index e2f0ac29b..a396722c1 100644
--- a/.github/workflows/mingw.yml
+++ b/.github/workflows/mingw.yml
@@ -48,7 +48,7 @@ jobs:
           --parallel
       
       - name: Test
-        run: >
+        run: |
           cd ${{github.workspace}}/build
           ctest
         
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cad25ef65..4d834e463 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -381,9 +381,11 @@ function(add_warning_flags name)
     $<$<CXX_COMPILER_ID:MSVC>:/Zi /W4 /WX /wd4127 /wd4324 /wd4201>
     $<$<NOT:$<OR:$<CXX_COMPILER_ID:MSVC>,$<STREQUAL:${CMAKE_CXX_SIMULATE_ID},MSVC>>>:-fno-rtti -Wall -Wextra -Werror -Wundef>
     $<$<CXX_COMPILER_ID:Clang>:-Wsign-conversion -Wconversion>)
-  target_link_options(${name} PRIVATE 
-    $<$<BOOL:${SNMALLOC_LINKER_SUPPORT_NO_ALLOW_SHLIB_UNDEF}>:-Wl,--no-undefined>
-    $<$<PLATFORM_ID:Windows>:$<${ci_or_debug}:/DEBUG>>)
+  if (NOT MINGW)
+    target_link_options(${name} PRIVATE 
+      $<$<BOOL:${SNMALLOC_LINKER_SUPPORT_NO_ALLOW_SHLIB_UNDEF}>:-Wl,--no-undefined>
+      $<$<PLATFORM_ID:Windows>:$<${ci_or_debug}:/DEBUG>>)
+  endif()
 endfunction()
 
 # To build with just the header library target define SNMALLOC_HEADER_ONLY_LIBRARY

From 79543e94625cb427e187d598a00507365dd0ed2d Mon Sep 17 00:00:00 2001
From: Schrodinger ZHU Yifan <i@zhuyi.fan>
Date: Fri, 30 Jan 2026 10:39:22 -0500
Subject: [PATCH 3/3] try fix

---
 CMakeLists.txt | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d834e463..cc8bfdf10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -381,11 +381,10 @@ function(add_warning_flags name)
     $<$<CXX_COMPILER_ID:MSVC>:/Zi /W4 /WX /wd4127 /wd4324 /wd4201>
     $<$<NOT:$<OR:$<CXX_COMPILER_ID:MSVC>,$<STREQUAL:${CMAKE_CXX_SIMULATE_ID},MSVC>>>:-fno-rtti -Wall -Wextra -Werror -Wundef>
     $<$<CXX_COMPILER_ID:Clang>:-Wsign-conversion -Wconversion>)
-  if (NOT MINGW)
-    target_link_options(${name} PRIVATE 
-      $<$<BOOL:${SNMALLOC_LINKER_SUPPORT_NO_ALLOW_SHLIB_UNDEF}>:-Wl,--no-undefined>
-      $<$<PLATFORM_ID:Windows>:$<${ci_or_debug}:/DEBUG>>)
-  endif()
+  
+  target_link_options(${name} PRIVATE 
+    $<$<BOOL:${SNMALLOC_LINKER_SUPPORT_NO_ALLOW_SHLIB_UNDEF}>:-Wl,--no-undefined>
+    $<$<PLATFORM_ID:Windows>:$<${ci_or_debug}:LINKER:/DEBUG>>)
 endfunction()
 
 # To build with just the header library target define SNMALLOC_HEADER_ONLY_LIBRARY