Temporary header file '/tmp/zk4OdZ4s0P/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
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d) 
#define HAVE_STDINT_H

  // add includes
  #include "/usr/include/libmodplug/stdafx.h"
  #include "/usr/include/libmodplug/modplug.h"
  #include "/usr/include/libmodplug/sndfile.h"

  // add classes
  CSoundFile* tmp_add_class_0;
  IMixPlugin* tmp_add_class_1;
  MODMIDICFG* tmp_add_class_2;
  SAMPLELOOPSTRUCT* tmp_add_class_3;
  WAVEDATAHEADER* tmp_add_class_4;
  WAVEEXTRAHEADER* tmp_add_class_5;
  WAVEFILEHEADER* tmp_add_class_6;
  WAVEFORMATHEADER* tmp_add_class_7;
  WAVELISTHEADER* tmp_add_class_8;
  WAVESAMPLERINFO* tmp_add_class_9;
  WAVESMPLHEADER* tmp_add_class_10;
  _G_fpos64_t* tmp_add_class_11;
  _G_fpos_t* tmp_add_class_12;
  _INSTRUMENTHEADER* tmp_add_class_13;
  _IO_cookie_io_functions_t* tmp_add_class_14;
  _MODCHANNEL* tmp_add_class_15;
  _MODCHANNELSETTINGS* tmp_add_class_16;
  _MODCOMMAND* tmp_add_class_17;
  _MODINSTRUMENT* tmp_add_class_18;
  _ModPlugNote* tmp_add_class_19;
  _ModPlug_Settings* tmp_add_class_20;
  _SNDMIXPLUGIN* tmp_add_class_21;
  _SNDMIXPLUGININFO* tmp_add_class_22;
  _SNDMIXPLUGINSTATE* tmp_add_class_23;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/zk4OdZ4s0P/dump1.h"