Temporary header file '/tmp/kwZ8r2C_yr/dump1.h' with the following content will be compiled to create GCC translation unit dump:

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

  // add includes
  #include "/usr/include/X11/SM/SM.h"
  #include "/usr/include/X11/SM/SMlib.h"
  #include "/usr/include/X11/SM/SMproto.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/kwZ8r2C_yr/dump1.h"