Temporary header file '/tmp/zrx1jI56qo/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)

  // add includes
  #include "/usr/include/ctlgeom.h"
  #include "/usr/include/ctl-math.h"
  #include "/usr/include/ctl.h"
  #include "/usr/include/ctlgeom-types.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;
  block_struct* tmp_add_class_3;
  compound_geometric_object_struct* tmp_add_class_4;
  cone_struct* tmp_add_class_5;
  cylinder_struct* tmp_add_class_6;
  ellipsoid_struct* tmp_add_class_7;
  geom_box_tree_struct* tmp_add_class_8;
  geometric_object_struct* tmp_add_class_9;
  itimerval* tmp_add_class_10;
  lattice_struct* tmp_add_class_11;
  prism_struct* tmp_add_class_12;
  scm_body_thunk_data* tmp_add_class_13;
  scm_dynstack* tmp_add_class_14;
  scm_print_state* tmp_add_class_15;
  scm_smob_descriptor* tmp_add_class_16;
  scm_t_array_dim* tmp_add_class_17;
  scm_t_array_handle* tmp_add_class_18;
  scm_t_c_hook* tmp_add_class_19;
  scm_t_c_hook_entry* tmp_add_class_20;
  scm_t_cell* tmp_add_class_21;
  scm_t_complex* tmp_add_class_22;
  scm_t_double* tmp_add_class_23;
  scm_t_fport* tmp_add_class_24;
  scm_t_hashtable* tmp_add_class_25;
  scm_t_option* tmp_add_class_26;
  scm_t_rng* tmp_add_class_27;
  scm_t_rstate* tmp_add_class_28;
  scm_thread* tmp_add_class_29;
  scm_unused_struct* tmp_add_class_30;
  scm_vm* tmp_add_class_31;
  scm_vm_cont* tmp_add_class_32;
  scm_vm_stack_element* tmp_add_class_33;
  sphere_struct* tmp_add_class_34;
  ucontext_t* tmp_add_class_35;
  wedge_struct* tmp_add_class_36;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/zrx1jI56qo/dump1.h"  -I/usr/include/guile/3.0