try to fix mingw runtime issues.

Author: enetheru

test/CMakeLists.txt

@@ -61,7 +61,14 @@ set_target_properties(
 )
 # gersemi: on
 
-# CMAKE_SYSTEM_NAME refers to the target system
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows" AND MINGW)
+    # Make the GDExtension DLL self-contained (no external MinGW runtime DLLs)
+    target_link_options(${TARGET_NAME} PRIVATE "$<IF:$<BOOL:${MINGW}>,-static-libgcc;-static-libstdc++,>")
+
+    # Also ensure no undefined symbols
+    target_link_options(${TARGET_NAME} PRIVATE -Wl,--no-undefined)
+endif()
+
 if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
     set_target_properties(
         ${TARGET_NAME}