Index: External/SPEC/SpecCPU2017.cmake
===================================================================
--- External/SPEC/SpecCPU2017.cmake
+++ External/SPEC/SpecCPU2017.cmake
@@ -344,7 +344,9 @@
 # file as an absolute path to the rundir.
 macro(speccpu2017_prepare_rundir)
   foreach (_runtype IN LISTS TEST_SUITE_RUN_TYPE)
-    llvm_copy_dir(${PROG} "${RUN_${_runtype}_DIR}" "${INPUT_all_DIR}")
+    if (EXISTS "${INPUT_all_DIR}")
+      llvm_copy_dir(${PROG} "${RUN_${_runtype}_DIR}" "${INPUT_all_DIR}")
+    endif ()
     llvm_copy_dir(${PROG} "${RUN_${_runtype}_DIR}" "${INPUT_${_runtype}_DIR}")
   endforeach ()
 endmacro()