Log detected version when building with CMake

Author: grynspan

cmake/modules/shared/CompilerSettings.cmake

@@ -44,4 +44,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "WASI")
 endif()
 
 file(STRINGS "../VERSION.txt" SWT_TESTING_LIBRARY_VERSION LIMIT_COUNT 1)
-add_compile_definitions("$<$<COMPILE_LANGUAGE:CXX>:SWT_TESTING_LIBRARY_VERSION=\"${SWT_TESTING_LIBRARY_VERSION}\">")
+if(SWT_TESTING_LIBRARY_VERSION)
+  message(STATUS "Swift Testing version: ${SWT_TESTING_LIBRARY_VERSION}")
+  add_compile_definitions("$<$<COMPILE_LANGUAGE:CXX>:SWT_TESTING_LIBRARY_VERSION=\"${SWT_TESTING_LIBRARY_VERSION}\">")
+endif()