Temporary header file '/tmp/65zST_orUn/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/zmq.hpp"
  #include "/usr/include/zmq_addon.hpp"

  // add namespaces
  namespace zmq{typedef int tmp_add_type_1;}
  zmq::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace zmq{namespace detail{typedef int tmp_add_type_2;}}
  zmq::detail::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace zmq{namespace detail{namespace ranges{typedef int tmp_add_type_3;}}}
  zmq::detail::ranges::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace zmq{namespace literals{typedef int tmp_add_type_4;}}
  zmq::literals::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace zmq{namespace sockopt{typedef int tmp_add_type_5;}}
  zmq::sockopt::tmp_add_type_5 tmp_add_func_5(){return 0;};

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;
  zmq_msg_t* tmp_add_class_3;
  zmq_pollitem_t* tmp_add_class_4;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/65zST_orUn/dump1.h"