From 19f8fcfd24217ec635131027bc6c1903d845df60 Mon Sep 17 00:00:00 2001
From: Tyler Yankee <tyler.yankee@kitware.com>
Date: Wed, 15 Apr 2026 16:18:53 -0400
Subject: [PATCH 1/2] Tests/File_Archive: Relax more stderr line matching

Much the same flavor as commit 6e638ce109 (Tests/File_Archive: Relax
stderr line matching, 2026-04-14, v4.3.2~9^2~1).
---
 .../argument-validation-compression-level-1-stderr.txt          | 2 +-
 .../argument-validation-compression-level-2-stderr.txt          | 2 +-
 .../File_Archive/argument-validation-threads-stderr.txt         | 2 +-
 .../File_Archive/unsupported-compression-level-stderr.txt       | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Tests/RunCMake/File_Archive/argument-validation-compression-level-1-stderr.txt b/Tests/RunCMake/File_Archive/argument-validation-compression-level-1-stderr.txt
index 53cd7f59c4..41501a5c4b 100644
--- a/Tests/RunCMake/File_Archive/argument-validation-compression-level-1-stderr.txt
+++ b/Tests/RunCMake/File_Archive/argument-validation-compression-level-1-stderr.txt
@@ -1,4 +1,4 @@
-^CMake Error at compression-level\.cmake:39 \(file\):
+^CMake Error at compression-level\.cmake:[0-9]+ \(file\):
   file compression level 100 for GZip should be in range 0 to 9
 Call Stack \(most recent call first\):
   argument-validation-compression-level-1\.cmake:8 \(check_compression_level\)
diff --git a/Tests/RunCMake/File_Archive/argument-validation-compression-level-2-stderr.txt b/Tests/RunCMake/File_Archive/argument-validation-compression-level-2-stderr.txt
index 4a8bc0c9e8..d1220122a2 100644
--- a/Tests/RunCMake/File_Archive/argument-validation-compression-level-2-stderr.txt
+++ b/Tests/RunCMake/File_Archive/argument-validation-compression-level-2-stderr.txt
@@ -1,4 +1,4 @@
-^CMake Error at compression-level\.cmake:39 \(file\):
+^CMake Error at compression-level\.cmake:[0-9]+ \(file\):
   file compression level high for GZip should be in range 0 to 9
 Call Stack \(most recent call first\):
   argument-validation-compression-level-2\.cmake:8 \(check_compression_level\)
diff --git a/Tests/RunCMake/File_Archive/argument-validation-threads-stderr.txt b/Tests/RunCMake/File_Archive/argument-validation-threads-stderr.txt
index efbeb0c1a1..61d38f5978 100644
--- a/Tests/RunCMake/File_Archive/argument-validation-threads-stderr.txt
+++ b/Tests/RunCMake/File_Archive/argument-validation-threads-stderr.txt
@@ -1,4 +1,4 @@
-^CMake Error at threads\.cmake:39 \(file\):
+^CMake Error at threads\.cmake:[0-9]+ \(file\):
   file number of threads -1 should be at least 0
 Call Stack \(most recent call first\):
   argument-validation-threads\.cmake:8 \(check_threads\)
diff --git a/Tests/RunCMake/File_Archive/unsupported-compression-level-stderr.txt b/Tests/RunCMake/File_Archive/unsupported-compression-level-stderr.txt
index 9c3678d753..b43fc1ff84 100644
--- a/Tests/RunCMake/File_Archive/unsupported-compression-level-stderr.txt
+++ b/Tests/RunCMake/File_Archive/unsupported-compression-level-stderr.txt
@@ -1,4 +1,4 @@
-CMake Error at compression-level\.cmake:39 \(file\):
+CMake Error at compression-level\.cmake:[0-9]+ \(file\):
   file compression level is not supported for compression "None"\.  Provided
   compression level: 1
 Call Stack \(most recent call first\):

From 4229667859f7309d13f0694102619ca989c7da34 Mon Sep 17 00:00:00 2001
From: Tyler Yankee <tyler.yankee@kitware.com>
Date: Wed, 15 Apr 2026 16:20:31 -0400
Subject: [PATCH 2/2] Tests: Extend symlink-related archive tests to
 cross-platform

Use `cmake -E create_symlink` or `file(CREATE_LINK)` as appropriate
instead of `ln -sf` on UNIX only to extend cases of (a) symlinks inside
archives and (b) archive extraction to a directory symlink to non-UNIX
platforms where either of these modes may be supported.

The latter relies on the NEW behavior of CMP0205 as it uses
`COPY_ON_ERROR` for platforms where directory symlinks aren't
supported.

Issue: #27756
---
 Tests/RunCMake/CommandLineTar/roundtrip.cmake | 22 ++++++++++++++-----
 .../File_Archive/compression-level.cmake      | 10 +++++++--
 Tests/RunCMake/File_Archive/roundtrip.cmake   | 22 ++++++++++++++-----
 Tests/RunCMake/File_Archive/threads.cmake     | 10 +++++++--
 4 files changed, 50 insertions(+), 14 deletions(-)

diff --git a/Tests/RunCMake/CommandLineTar/roundtrip.cmake b/Tests/RunCMake/CommandLineTar/roundtrip.cmake
index eeafcdbf1c..53bbbc6bc4 100644
--- a/Tests/RunCMake/CommandLineTar/roundtrip.cmake
+++ b/Tests/RunCMake/CommandLineTar/roundtrip.cmake
@@ -37,17 +37,29 @@ foreach(file ${CHECK_FILES})
   configure_file(${CMAKE_CURRENT_LIST_FILE} ${FULL_COMPRESS_DIR}/${file} COPYONLY)
 endforeach()
 
-if(UNIX)
-  execute_process(COMMAND ln -sf f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt)
+# Test a (file) symlink inside the archive on platforms which support it.
+execute_process(
+  COMMAND ${CMAKE_COMMAND} -E create_symlink f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt
+  OUTPUT_VARIABLE create_symlink_stdout
+  ERROR_VARIABLE create_symlink_stderr
+  RESULT_VARIABLE create_symlink_result
+)
+if(create_symlink_result EQUAL 0 AND EXISTS "${FULL_COMPRESS_DIR}/d1/f2.txt")
   list(APPEND CHECK_FILES "d1/f2.txt")
 endif()
 
 file(REMOVE ${FULL_OUTPUT_NAME})
 file(REMOVE_RECURSE ${FULL_DECOMPRESS_DIR})
-if(DESTINATION_SYMLINK AND UNIX)
+if(DESTINATION_SYMLINK)
+  # If specified, test extraction to a directory symlink on platforms which
+  # support it, but fall back to a plain directory otherwise.
+  cmake_policy(SET CMP0205 NEW)
   file(MAKE_DIRECTORY ${FULL_DECOMPRESS_DIR}-dir)
-  execute_process(COMMAND ln -sf
-    ${FULL_DECOMPRESS_DIR}-dir ${FULL_DECOMPRESS_DIR})
+  file(CREATE_LINK
+    ${FULL_DECOMPRESS_DIR}-dir ${FULL_DECOMPRESS_DIR}
+    COPY_ON_ERROR
+    SYMBOLIC
+  )
 else()
   file(MAKE_DIRECTORY ${FULL_DECOMPRESS_DIR})
 endif()
diff --git a/Tests/RunCMake/File_Archive/compression-level.cmake b/Tests/RunCMake/File_Archive/compression-level.cmake
index 2f5141df18..4d5a6178ab 100644
--- a/Tests/RunCMake/File_Archive/compression-level.cmake
+++ b/Tests/RunCMake/File_Archive/compression-level.cmake
@@ -27,8 +27,14 @@ function(check_compression_level COMPRESSION_LEVEL)
     configure_file(${CMAKE_CURRENT_LIST_FILE} ${FULL_COMPRESS_DIR}/${file} COPYONLY)
   endforeach()
 
-  if(UNIX)
-    execute_process(COMMAND ln -sf f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt)
+  # Test a (file) symlink inside the archive on platforms which support it.
+  execute_process(
+    COMMAND ${CMAKE_COMMAND} -E create_symlink f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt
+    OUTPUT_VARIABLE create_symlink_stdout
+    ERROR_VARIABLE create_symlink_stderr
+    RESULT_VARIABLE create_symlink_result
+  )
+  if(create_symlink_result EQUAL 0 AND EXISTS "${FULL_COMPRESS_DIR}/d1/f2.txt")
     list(APPEND CHECK_FILES "d1/f2.txt")
   endif()
 
diff --git a/Tests/RunCMake/File_Archive/roundtrip.cmake b/Tests/RunCMake/File_Archive/roundtrip.cmake
index a2048930de..78a138db94 100644
--- a/Tests/RunCMake/File_Archive/roundtrip.cmake
+++ b/Tests/RunCMake/File_Archive/roundtrip.cmake
@@ -26,17 +26,29 @@ foreach(file ${CHECK_FILES})
   configure_file(${CMAKE_CURRENT_LIST_FILE} ${FULL_COMPRESS_DIR}/${file} COPYONLY)
 endforeach()
 
-if(UNIX)
-  execute_process(COMMAND ln -sf f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt)
+# Test a (file) symlink inside the archive on platforms which support it.
+execute_process(
+  COMMAND ${CMAKE_COMMAND} -E create_symlink f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt
+  OUTPUT_VARIABLE create_symlink_stdout
+  ERROR_VARIABLE create_symlink_stderr
+  RESULT_VARIABLE create_symlink_result
+)
+if(create_symlink_result EQUAL 0 AND EXISTS "${FULL_COMPRESS_DIR}/d1/f2.txt")
   list(APPEND CHECK_FILES "d1/f2.txt")
 endif()
 
 file(REMOVE ${FULL_OUTPUT_NAME})
 file(REMOVE_RECURSE ${FULL_DECOMPRESS_DIR})
-if(DESTINATION_SYMLINK AND UNIX)
+if(DESTINATION_SYMLINK)
+  # If specified, test extraction to a directory symlink on platforms which
+  # support it, but fall back to a plain directory otherwise.
+  cmake_policy(SET CMP0205 NEW)
   file(MAKE_DIRECTORY ${FULL_DECOMPRESS_DIR}-dir)
-  execute_process(COMMAND ln -sf
-    ${FULL_DECOMPRESS_DIR}-dir ${FULL_DECOMPRESS_DIR})
+  file(CREATE_LINK
+    ${FULL_DECOMPRESS_DIR}-dir ${FULL_DECOMPRESS_DIR}
+    COPY_ON_ERROR
+    SYMBOLIC
+  )
 else()
   file(MAKE_DIRECTORY ${FULL_DECOMPRESS_DIR})
 endif()
diff --git a/Tests/RunCMake/File_Archive/threads.cmake b/Tests/RunCMake/File_Archive/threads.cmake
index 6a44ab77fa..2376e2077d 100644
--- a/Tests/RunCMake/File_Archive/threads.cmake
+++ b/Tests/RunCMake/File_Archive/threads.cmake
@@ -27,8 +27,14 @@ function(check_threads THREADS)
     configure_file(${CMAKE_CURRENT_LIST_FILE} ${FULL_COMPRESS_DIR}/${file} COPYONLY)
   endforeach()
 
-  if(UNIX)
-    execute_process(COMMAND ln -sf f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt)
+  # Test a (file) symlink inside the archive on platforms which support it.
+  execute_process(
+    COMMAND ${CMAKE_COMMAND} -E create_symlink f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt
+    OUTPUT_VARIABLE create_symlink_stdout
+    ERROR_VARIABLE create_symlink_stderr
+    RESULT_VARIABLE create_symlink_result
+  )
+  if(create_symlink_result EQUAL 0 AND EXISTS "${FULL_COMPRESS_DIR}/d1/f2.txt")
     list(APPEND CHECK_FILES "d1/f2.txt")
   endif()