Temporary header file '/tmp/iPjz1y2clK/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
typedef float _Float32;
typedef long double _Float64;
typedef double _Float32x;

  // add includes
  #include "/usr/include/libfprint-2/tod-1/drivers_api.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-assembling.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-byte-reader.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-byte-utils.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-byte-writer.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-compat.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-context.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-device.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-enums.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-image-device.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-image.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-log.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-minutiae.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-print.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-spi-transfer.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-ssm.h"
  #include "/usr/include/libfprint-2/tod-1/fpi-usb-transfer.h"
  #include "/usr/include/libfprint-2/tod-1/tod/tod-macros.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -U__cplusplus -D_Bool="bool" -fpreprocessed -x c++ -fpermissive -w "/tmp/iPjz1y2clK/dump1.i"  -I/usr/include/libfprint-2 -I/usr/include/gusb-1 -I/usr/include/glib-2.0 -I/lib/arm-linux-gnueabihf/glib-2.0/include

In file included from /tmp/iPjz1y2clK/dump1.h:16:
/usr/include/libfprint-2/tod-1/fpi-byte-reader.h: In function ‘guint8* fpi_byte_reader_dup_data_unchecked(FpiByteReader*, guint)’:
/usr/include/libfprint-2/tod-1/fpi-byte-reader.h:364:36: error: void value not ignored as it ought to be
  364 |   return (guint8 *) g_memdup2 (data, size);