Temporary header file '/tmp/niBnsXZ7Tb/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _TIME_BITS 64
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED

  // add includes
  #include "/usr/include/fontconfig/fontconfig.h"
  #include "/usr/include/fontconfig/fcfreetype.h"
  #include "/usr/include/fontconfig/fcprivate.h"

  // add classes
  FT_BBox_* tmp_add_class_0;
  FT_Bitmap_* tmp_add_class_1;
  FT_Bitmap_Size_* tmp_add_class_2;
  FT_CharMapRec_* tmp_add_class_3;
  FT_Data_* tmp_add_class_4;
  FT_FaceRec_* tmp_add_class_5;
  FT_Generic_* tmp_add_class_6;
  FT_GlyphSlotRec_* tmp_add_class_7;
  FT_Glyph_Metrics_* tmp_add_class_8;
  FT_ListNodeRec_* tmp_add_class_9;
  FT_ListRec_* tmp_add_class_10;
  FT_Matrix_* tmp_add_class_11;
  FT_MemoryRec_* tmp_add_class_12;
  FT_Open_Args_* tmp_add_class_13;
  FT_Outline_* tmp_add_class_14;
  FT_Outline_Funcs_* tmp_add_class_15;
  FT_Parameter_* tmp_add_class_16;
  FT_Raster_Funcs_* tmp_add_class_17;
  FT_Raster_Params_* tmp_add_class_18;
  FT_SizeRec_* tmp_add_class_19;
  FT_Size_Metrics_* tmp_add_class_20;
  FT_Size_RequestRec_* tmp_add_class_21;
  FT_Span_* tmp_add_class_22;
  FT_StreamDesc_* tmp_add_class_23;
  FT_StreamRec_* tmp_add_class_24;
  FT_UnitVector_* tmp_add_class_25;
  FT_Vector_* tmp_add_class_26;
  _FcConfigFileInfoIter* tmp_add_class_27;
  _FcConstant* tmp_add_class_28;
  _FcFontSet* tmp_add_class_29;
  _FcMatrix* tmp_add_class_30;
  _FcObjectSet* tmp_add_class_31;
  _FcObjectType* tmp_add_class_32;
  _FcPatternIter* tmp_add_class_33;
  _FcValue* tmp_add_class_34;
  _G_fpos64_t* tmp_add_class_35;
  _G_fpos_t* tmp_add_class_36;
  _IO_cookie_io_functions_t* tmp_add_class_37;
  statx_timestamp* tmp_add_class_38;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/niBnsXZ7Tb/dump1.h"  -I/usr/include/freetype2