Fixed testing with out-of-source builds using cmake
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index be93649..c6b908d 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -69,3 +69,25 @@
add_test_suite(xtea)
add_test_suite(x509parse)
add_test_suite(x509write)
+
+# Make data_files available in an out-of-source build
+if (NOT ${CMAKE_CURRENT_BINARY_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
+ # Get OS dependent path to use in `execute_process`
+ file(TO_NATIVE_PATH "${CMAKE_CURRENT_BINARY_DIR}/data_files" link)
+ file(TO_NATIVE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/data_files" target)
+
+ if (UNIX)
+ set(command ln -s ${target} ${link})
+ else()
+ set(command cmd.exe /c mklink ${link} ${target})
+ endif()
+
+ execute_process(COMMAND ${command}
+ RESULT_VARIABLE result
+ ERROR_VARIABLE output)
+
+ if (NOT ${result} EQUAL 0)
+ message(FATAL_ERROR "Could not create symbolic link for: ${target} --> ${output}")
+ endif()
+endif()
+