From 2ea7e3ad069dc7fc217cac9fec20e6e87796e60c Mon Sep 17 00:00:00 2001
From: Arths17 <Atharvranjan8@gmail.com>
Date: Thu, 5 Mar 2026 23:05:10 -0600
Subject: [PATCH] Fix Windows build issues with IPPICV unpack and IPPIW
 CMakeLists.txt copy (#28608)

- Replace execute_process(tar) with file(ARCHIVE_EXTRACT) for native .zip support
  and better Windows path handling when CMAKE_VERSION >= 3.18
- Replace execute_process copy with file(COPY) and existence check for reliable
  CMakeLists.txt copying to avoid timing/path issues on Windows
- Maintains backward compatibility with older CMake versions and Linux behavior

Fixes issue #28608
---
 cmake/OpenCVDownload.cmake  | 16 +++++++++++-----
 cmake/OpenCVFindIPPIW.cmake |  4 +++-
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/cmake/OpenCVDownload.cmake b/cmake/OpenCVDownload.cmake
index 40e48d7465..0f8de153d8 100644
--- a/cmake/OpenCVDownload.cmake
+++ b/cmake/OpenCVDownload.cmake
@@ -282,11 +282,17 @@ ${OPENCV_DOWNLOAD_LOG}
     ocv_download_log("#mkdir \"${DL_DESTINATION_DIR}\"")
     file(MAKE_DIRECTORY "${DL_DESTINATION_DIR}")
     ocv_download_log("#unpack \"${DL_DESTINATION_DIR}\" \"${CACHE_CANDIDATE}\"")
-    execute_process(COMMAND "${CMAKE_COMMAND}" -E tar xzf "${CACHE_CANDIDATE}"
-                    WORKING_DIRECTORY "${DL_DESTINATION_DIR}"
-                    RESULT_VARIABLE res)
-    if(NOT res EQUAL 0)
-      message(FATAL_ERROR "${__msg_prefix}Unpack failed: ${res}")
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.18")
+      file(ARCHIVE_EXTRACT
+        INPUT "${CACHE_CANDIDATE}"
+        DESTINATION "${DL_DESTINATION_DIR}")
+    else()
+      execute_process(COMMAND "${CMAKE_COMMAND}" -E tar xzf "${CACHE_CANDIDATE}"
+                      WORKING_DIRECTORY "${DL_DESTINATION_DIR}"
+                      RESULT_VARIABLE res)
+      if(NOT res EQUAL 0)
+        message(FATAL_ERROR "${__msg_prefix}Unpack failed: ${res}")
+      endif()
     endif()
   else()
     ocv_download_log("#copy \"${COPY_DESTINATION}\" \"${CACHE_CANDIDATE}\"")
diff --git a/cmake/OpenCVFindIPPIW.cmake b/cmake/OpenCVFindIPPIW.cmake
index 1e065e10f6..b32113c5ac 100644
--- a/cmake/OpenCVFindIPPIW.cmake
+++ b/cmake/OpenCVFindIPPIW.cmake
@@ -83,7 +83,9 @@ macro(ippiw_setup PATH BUILD)
           set(IPP_IW_LIBRARY ippiw)
           set(IPP_IW_INCLUDES "${IPP_IW_PATH}/include")
           set(IPP_IW_LIBRARIES ${IPP_IW_LIBRARY})
-          execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${OpenCV_SOURCE_DIR}/3rdparty/ippicv/CMakeLists.txt" "${IPP_IW_PATH}/")
+          if(NOT EXISTS "${IPP_IW_PATH}/CMakeLists.txt")
+            file(COPY "${OpenCV_SOURCE_DIR}/3rdparty/ippicv/CMakeLists.txt" DESTINATION "${IPP_IW_PATH}")
+          endif()
           add_subdirectory("${IPP_IW_PATH}/" ${OpenCV_BINARY_DIR}/3rdparty/ippiw)
 
           set(HAVE_IPP_IW 1)