Temporary header file '/tmp/fwQ2C1fgX8/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/zimg++.hpp"
  #include "/usr/include/zimg.h"

  // add namespaces
  namespace zimgxx{typedef int tmp_add_type_1;}
  zimgxx::tmp_add_type_1 tmp_add_func_1(){return 0;};

  // add classes
  zimg_graph_builder_params* tmp_add_class_0;
  zimg_image_buffer* tmp_add_class_1;
  zimg_image_buffer_const* tmp_add_class_2;
  zimg_image_format* tmp_add_class_3;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/fwQ2C1fgX8/dump1.h"