diff --git a/cmake-tool/helpers/cpio.cmake b/cmake-tool/helpers/cpio.cmake
index 732fb945..ba958ac0 100644
--- a/cmake-tool/helpers/cpio.cmake
+++ b/cmake-tool/helpers/cpio.cmake
@@ -43,12 +43,20 @@ function(MakeCPIO output_name input_files)
     if(NOT "${MAKE_CPIO_CPIO_SYMBOL}" STREQUAL "")
         set(archive_symbol ${MAKE_CPIO_CPIO_SYMBOL})
     endif()
+
+    # intermediate files
+    set(cpio_archive "archive.${output_name}.cpio")
+    set(cpio_archive_s "${output_name}.S")
+
     # Check that the reproducible flag is available. Don't use it if it isn't.
     CheckCPIOArgument(cpio_reproducible_flag "--reproducible")
     set(
-        commands
-        "bash;-c;cpio ${cpio_reproducible_flag} --quiet --create -H newc --file=${CMAKE_CURRENT_BINARY_DIR}/archive.${output_name}.cpio;&&"
+        cpio_cmd
+        "cpio ${cpio_reproducible_flag} --quiet --create -H newc --file=${CMAKE_CURRENT_BINARY_DIR}/${cpio_archive}"
     )
+
+    set(tmp_dir "temp_${output_name}")
+    set(commands "bash;-c;${cpio_cmd};&&")
     foreach(file IN LISTS input_files)
         # Try and generate reproducible cpio meta-data as we do this:
         # - touch -d @0 file sets the modified time to 0
@@ -57,10 +65,11 @@ function(MakeCPIO output_name input_files)
         list(
             APPEND
                 commands
-                "bash;-c; mkdir -p temp_${output_name} && cd temp_${output_name} && cp -a ${file} . && touch -d 1970-01-01T00:00:00Z `basename ${file}` && echo `basename ${file}` | cpio --append ${cpio_reproducible_flag} --owner=+0:+0 --quiet -o -H newc --file=${CMAKE_CURRENT_BINARY_DIR}/archive.${output_name}.cpio && rm `basename ${file}` && cd ../ && rmdir temp_${output_name};&&"
+                "bash;-c; mkdir -p ${tmp_dir} && cd ${tmp_dir} && cp -a ${file} . && touch -d 1970-01-01T00:00:00Z `basename ${file}` && echo `basename ${file}` | ${cpio_cmd} --append --owner=+0:+0 && rm `basename ${file}` && cd ../ && rmdir ${tmp_dir};&&"
         )
     endforeach()
     list(APPEND commands "true")
+
     separate_arguments(cmake_c_flags_sep NATIVE_COMMAND "${CMAKE_C_FLAGS}")
     if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
         list(APPEND cmake_c_flags_sep "${CMAKE_C_COMPILE_OPTIONS_TARGET}${CMAKE_C_COMPILER_TARGET}")
@@ -68,19 +77,19 @@ function(MakeCPIO output_name input_files)
 
     add_custom_command(
         OUTPUT ${output_name}
-        COMMAND rm -f archive.${output_name}.cpio
+        COMMAND rm -f ${cpio_archive}
         COMMAND ${commands}
         COMMAND
             sh -c
-            "echo 'X.section ._archive_cpio,\"aw\"X.globl ${archive_symbol}, ${archive_symbol}_endX${archive_symbol}:X.incbin \"archive.${output_name}.cpio\"X${archive_symbol}_end:X' | tr X '\\n'"
-            > ${output_name}.S
+            "echo 'X.section ._archive_cpio,\"aw\"X.globl ${archive_symbol}, ${archive_symbol}_endX${archive_symbol}:X.incbin \"${cpio_archive}\"X${archive_symbol}_end:X' | tr X '\\n'"
+            > "${cpio_archive_s}"
         COMMAND
-            ${CMAKE_C_COMPILER} ${cmake_c_flags_sep} -c -o ${output_name} ${output_name}.S
+            ${CMAKE_C_COMPILER} ${cmake_c_flags_sep} -c -o ${output_name} "${cpio_archive_s}"
         DEPENDS ${input_files} ${MAKE_CPIO_DEPENDS}
         VERBATIM
         BYPRODUCTS
-        archive.${output_name}.cpio
-        ${output_name}.S
+        "${cpio_archive}"
+        "${cpio_archive_s}"
         COMMENT "Generate CPIO archive ${output_name}"
     )
 endfunction(MakeCPIO)