Temporary header file '/tmp/U9zfDFkfXx/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/vulkan/cast_utils.h"
  #include "/usr/include/vulkan/hash_util.h"
  #include "/usr/include/vulkan/hash_vk_types.h"
  #include "/usr/include/vulkan/vk_dispatch_table_helper.h"
  #include "/usr/include/vulkan/vk_enum_string_helper.h"
  #include "/usr/include/vulkan/vk_extension_helper.h"
  #include "/usr/include/vulkan/vk_format_utils.h"
  #include "/usr/include/vulkan/vk_layer_config.h"
  #include "/usr/include/vulkan/vk_layer_data.h"
  #include "/usr/include/vulkan/vk_layer_dispatch_table.h"
  #include "/usr/include/vulkan/vk_layer_extension_utils.h"
  #include "/usr/include/vulkan/vk_layer_logging.h"
  #include "/usr/include/vulkan/vk_layer_utils.h"
  #include "/usr/include/vulkan/vk_object_types.h"
  #include "/usr/include/vulkan/vk_safe_struct.h"
  #include "/usr/include/vulkan/vk_typemap_helper.h"
  #include "/usr/include/vulkan/vk_validation_error_messages.h"
  #include "/usr/include/vulkan/xxhash.h"

  // add namespaces
  namespace hash_util{typedef int tmp_add_type_1;}
  hash_util::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace layer_data{typedef int tmp_add_type_2;}
  layer_data::tmp_add_type_2 tmp_add_func_2(){return 0;};

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/U9zfDFkfXx/dump1.h"

In file included from /tmp/U9zfDFkfXx/dump1.h:14:
/usr/include/vulkan/hash_vk_types.h:25:10: fatal error: vulkan/vulkan.h: No such file or directory
   25 | #include <vulkan/vulkan.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.