Temporary header file '/tmp/4vuaVCpJ8r/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/biometry/application.h"
  #include "/usr/include/biometry/dbus/service.h"
  #include "/usr/include/biometry/device.h"
  #include "/usr/include/biometry/devices/fingerprint_reader.h"
  #include "/usr/include/biometry/devices/plugin/interface.h"
  #include "/usr/include/biometry/dictionary.h"
  #include "/usr/include/biometry/do_not_copy_or_move.h"
  #include "/usr/include/biometry/geometry.h"
  #include "/usr/include/biometry/hardware/biometry.h"
  #include "/usr/include/biometry/identifier.h"
  #include "/usr/include/biometry/operation.h"
  #include "/usr/include/biometry/optional.h"
  #include "/usr/include/biometry/percent.h"
  #include "/usr/include/biometry/progress.h"
  #include "/usr/include/biometry/reason.h"
  #include "/usr/include/biometry/service.h"
  #include "/usr/include/biometry/template_store.h"
  #include "/usr/include/biometry/user.h"
  #include "/usr/include/biometry/variant.h"
  #include "/usr/include/biometry/verifier.h"
  #include "/usr/include/biometry/version.h"
  #include "/usr/include/biometry/visibility.h"
  #include "/usr/include/biometry/void.h"

  // add namespaces
  namespace biometry{typedef int tmp_add_type_1;}
  biometry::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace biometry{namespace dbus{typedef int tmp_add_type_2;}}
  biometry::dbus::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace biometry{namespace util{typedef int tmp_add_type_3;}}
  biometry::util::tmp_add_type_3 tmp_add_func_3(){return 0;};

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/4vuaVCpJ8r/dump1.h"

In file included from /usr/include/biometry/devices/fingerprint_reader.h:24,
                 from /tmp/4vuaVCpJ8r/dump1.h:15:
/usr/include/biometry/optional.h:23:10: fatal error: boost/optional.hpp: No such file or directory
   23 | #include <boost/optional.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.