cpio.cmake: allow passing a directory also

This allows creating the archive in a subfolder, so "pollution" of the
root folder can be avoided.

Signed-off-by: Axel Heider <axel.heider@hensoldt.net>

cmake-tool/helpers/cpio.cmake

@@ -44,9 +44,15 @@ function(MakeCPIO output_name input_files)
         set(archive_symbol ${MAKE_CPIO_CPIO_SYMBOL})
     endif()
 
+    get_filename_component(cpio_lib_name "${output_name}" NAME)
+    get_filename_component(cpio_lib_dir "${output_name}" DIRECTORY)
+    if(NOT cpio_lib_dir)
+        set(cpio_lib_dir "${CMAKE_CURRENT_BINARY_DIR}")
+    endif()
+
     # intermediate files
-    set(cpio_archive "archive.${output_name}.cpio")
-    set(cpio_archive_s "${output_name}.S")
+    set(cpio_archive "${cpio_lib_dir}/${cpio_lib_name}.cpio")
+    set(cpio_archive_s "${cpio_lib_dir}/${cpio_lib_name}.S")
 
     # Try to generate reproducible cpio archives using a command sequence that
     # runs in a separate shell in a temp folder. It creates an empty archive
@@ -60,10 +66,9 @@ function(MakeCPIO output_name input_files)
     CheckCPIOArgument(cpio_reproducible_flag "--reproducible")
     set(
         cpio_cmd
-        "cpio ${cpio_reproducible_flag} --quiet --create --format=newc --file=${CMAKE_CURRENT_BINARY_DIR}/${cpio_archive}"
+        "cpio ${cpio_reproducible_flag} --quiet --create --format=newc --file=${cpio_archive}"
     )
-
-    set(tmp_dir "temp_${output_name}")
+    set(tmp_dir "${cpio_lib_dir}/temp_${cpio_lib_name}")
     set(make_cpio "cd ${tmp_dir} && ${cpio_cmd}")
     foreach(file IN LISTS input_files)
         string(
@@ -79,7 +84,7 @@ function(MakeCPIO output_name input_files)
     # contains the cpio archive.
     file(
         WRITE
-            "${CMAKE_CURRENT_BINARY_DIR}/${cpio_archive_s}"
+            "${cpio_archive_s}"
             "# auto-generated file from MakeCPIO(), do not edit\n"
             ".section ._archive_cpio, \"aw\"\n"
             ".globl ${archive_symbol}, ${archive_symbol}_end\n"