cmake: kconfig: use absolute files for merge_config_files

The `merge_config_files` list contains files with both relative and
absolute paths.
Each entry is checked and files with a relative path are converted to
absolute path. This creates a `merge_config_files_with_absolute_paths`
identical to the `merge_config_files` but with absolute path on each
entry.

Afterwards it is mixed whether `merge_config_files` or
`merge_config_files_with_absolute_paths` are used creating unnecessary
risk when the list with relative path files are used.

This commit sets the content of `merge_config_files` with updated
absolute paths files, and also updates all places to use this list.

This ensures that after path conversion then only the list with absolute
paths is used.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

cmake/kconfig.cmake

@@ -204,8 +204,9 @@ foreach(f ${merge_config_files})
 
   list(APPEND merge_config_files_with_absolute_paths ${path})
 endforeach()
+set(merge_config_files ${merge_config_files_with_absolute_paths})
 
-foreach(f ${merge_config_files_with_absolute_paths})
+foreach(f ${merge_config_files})
   if(NOT EXISTS ${f} OR IS_DIRECTORY ${f})
     message(FATAL_ERROR "File not found: ${f}")
   endif()
@@ -214,7 +215,7 @@ endforeach()
 # Calculate a checksum of merge_config_files to determine if we need
 # to re-generate .config
 set(merge_config_files_checksum "")
-foreach(f ${merge_config_files_with_absolute_paths})
+foreach(f ${merge_config_files})
   file(MD5 ${f} checksum)
   set(merge_config_files_checksum "${merge_config_files_checksum}${checksum}")
 endforeach()