Temporary header file '/tmp/PGmMZe5nEK/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/mqtt/async_client.h"
  #include "/usr/include/mqtt/buffer_ref.h"
  #include "/usr/include/mqtt/buffer_view.h"
  #include "/usr/include/mqtt/callback.h"
  #include "/usr/include/mqtt/client.h"
  #include "/usr/include/mqtt/connect_options.h"
  #include "/usr/include/mqtt/create_options.h"
  #include "/usr/include/mqtt/delivery_token.h"
  #include "/usr/include/mqtt/disconnect_options.h"
  #include "/usr/include/mqtt/exception.h"
  #include "/usr/include/mqtt/iaction_listener.h"
  #include "/usr/include/mqtt/iasync_client.h"
  #include "/usr/include/mqtt/iclient_persistence.h"
  #include "/usr/include/mqtt/message.h"
  #include "/usr/include/mqtt/properties.h"
  #include "/usr/include/mqtt/response_options.h"
  #include "/usr/include/mqtt/server_response.h"
  #include "/usr/include/mqtt/ssl_options.h"
  #include "/usr/include/mqtt/string_collection.h"
  #include "/usr/include/mqtt/subscribe_options.h"
  #include "/usr/include/mqtt/thread_queue.h"
  #include "/usr/include/mqtt/token.h"
  #include "/usr/include/mqtt/topic.h"
  #include "/usr/include/mqtt/types.h"
  #include "/usr/include/mqtt/will_options.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/PGmMZe5nEK/dump1.h"

In file included from /tmp/PGmMZe5nEK/dump1.h:12:
/usr/include/mqtt/async_client.h:28:10: fatal error: MQTTAsync.h: No such file or directory
   28 | #include "MQTTAsync.h"
      |          ^~~~~~~~~~~~~
compilation terminated.