Temporary header file '/tmp/ZmtJcKrRE2/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/FL/abi-version.h"
  #include "/usr/include/FL/dirent.h"
  #include "/usr/include/FL/fl_types.h"
  #include "/usr/include/FL/fl_utf8.h"
  #include "/usr/include/FL/gl.h"
  #include "/usr/include/FL/gl2opengl.h"
  #include "/usr/include/FL/glu.h"
  #include "/usr/include/FL/math.h"
  #include "/usr/include/FL/names.h"

  // 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;
  statx_timestamp* tmp_add_class_3;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/ZmtJcKrRE2/dump1.h"