Macro to auto include all directories that contain headers. Useful when no naming conflicts exist. Benefit of not specifying relative paths to your own headers. This can easily be integrated with conan

CMakeLists.txt

# Search all directories that contain headers
macro(HEADER_DIRECTORIES return_list)
  file(GLOB_RECURSE new_list *.h)
  set(dir_list "")
  foreach(file_path ${new_list})
    get_filename_component(dir_path ${file_path} PATH)
    set(dir_list ${dir_list} ${dir_path})
  endforeach()
  list(REMOVE_DUPLICATES dir_list)
  set(${return_list} ${dir_list})
endmacro()

# Get all header dirs to include
header_directories(header_dir_list)

list(LENGTH header_dir_list header_dir_list_count)
message(STATUS "[INFO] Found ${header_dir_list_count} header directories.")

target_include_directories(
  ${PROJECT_NAME}
  PUBLIC
  ${header_dir_list}
)