From 593d986470ce1938436da312e0c93e3c9c07017e Mon Sep 17 00:00:00 2001
From: Tushar Maheshwari <tushar27192@gmail.com>
Date: Sun, 13 Jan 2019 21:05:58 +0530
Subject: Tests: Avoid cross-device links in CREATE_LINK test

Add a test for COPY_ON_ERROR to cover that scenario.
---
 Tests/RunCMake/file/CREATE_LINK-COPY_ON_ERROR.cmake | 11 +++++++++++
 Tests/RunCMake/file/CREATE_LINK.cmake               |  9 ++++++++-
 Tests/RunCMake/file/RunCMakeTest.cmake              |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 Tests/RunCMake/file/CREATE_LINK-COPY_ON_ERROR.cmake

diff --git a/Tests/RunCMake/file/CREATE_LINK-COPY_ON_ERROR.cmake b/Tests/RunCMake/file/CREATE_LINK-COPY_ON_ERROR.cmake
new file mode 100644
index 0000000..777ef4e
--- /dev/null
+++ b/Tests/RunCMake/file/CREATE_LINK-COPY_ON_ERROR.cmake
@@ -0,0 +1,11 @@
+# Use COPY_ON_ERROR to handle the case where the source and destination
+# directory are on different devices. Cross-device links are not permitted
+# and the following command falls back to copying the file if link fails.
+file(CREATE_LINK
+  ${CMAKE_CURRENT_LIST_FILE} TestCreateLink.cmake
+  RESULT result
+  COPY_ON_ERROR
+  )
+if(NOT result STREQUAL "0")
+  message(SEND_ERROR "COPY_ON_ERROR failed: '${result}'")
+endif()
diff --git a/Tests/RunCMake/file/CREATE_LINK.cmake b/Tests/RunCMake/file/CREATE_LINK.cmake
index b7c090e..ca61646 100644
--- a/Tests/RunCMake/file/CREATE_LINK.cmake
+++ b/Tests/RunCMake/file/CREATE_LINK.cmake
@@ -1,4 +1,11 @@
-file(CREATE_LINK ${CMAKE_CURRENT_LIST_FILE} TestLink.cmake RESULT result)
+# start with a file in the same directory to avoid cross-device links
+set(test_file ${CMAKE_CURRENT_BINARY_DIR}/CreateLinkTest.txt)
+file(TOUCH ${test_file})
+
+file(CREATE_LINK
+  ${test_file} ${CMAKE_CURRENT_BINARY_DIR}/TestCreateLink.txt
+  RESULT result
+  )
 if(NOT result STREQUAL "0")
   message(SEND_ERROR "Hard link result='${result}'")
 endif()
diff --git a/Tests/RunCMake/file/RunCMakeTest.cmake b/Tests/RunCMake/file/RunCMakeTest.cmake
index bbabddd..128e8f3 100644
--- a/Tests/RunCMake/file/RunCMakeTest.cmake
+++ b/Tests/RunCMake/file/RunCMakeTest.cmake
@@ -1,6 +1,7 @@
 include(RunCMake)
 
 run_cmake(CREATE_LINK)
+run_cmake(CREATE_LINK-COPY_ON_ERROR)
 run_cmake(CREATE_LINK-noarg)
 run_cmake(CREATE_LINK-noexist)
 run_cmake(DOWNLOAD-hash-mismatch)
-- 
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