Temporary header file '/tmp/P2fp1afOXb/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _FILE_OFFSET_BITS 64
#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/libopenmpt/libopenmpt.h"
  #include "/usr/include/libopenmpt/libopenmpt.hpp"
  #include "/usr/include/libopenmpt/libopenmpt_config.h"
  #include "/usr/include/libopenmpt/libopenmpt_ext.h"
  #include "/usr/include/libopenmpt/libopenmpt_ext.hpp"
  #include "/usr/include/libopenmpt/libopenmpt_stream_callbacks_buffer.h"
  #include "/usr/include/libopenmpt/libopenmpt_stream_callbacks_fd.h"
  #include "/usr/include/libopenmpt/libopenmpt_stream_callbacks_file.h"
  #include "/usr/include/libopenmpt/libopenmpt_version.h"

  // add namespaces
  namespace openmpt{typedef int tmp_add_type_1;}
  openmpt::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace openmpt{namespace detail{typedef int tmp_add_type_2;}}
  openmpt::detail::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace openmpt{namespace ext{typedef int tmp_add_type_3;}}
  openmpt::ext::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace openmpt{namespace string{typedef int tmp_add_type_4;}}
  openmpt::string::tmp_add_type_4 tmp_add_func_4(){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;
  openmpt_module_ext_interface_interactive* tmp_add_class_3;
  openmpt_module_ext_interface_interactive2* tmp_add_class_4;
  openmpt_module_ext_interface_pattern_vis* tmp_add_class_5;
  openmpt_module_initial_ctl* tmp_add_class_6;
  openmpt_stream_buffer* tmp_add_class_7;
  openmpt_stream_callbacks* tmp_add_class_8;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/P2fp1afOXb/dump1.h"