Temporary header file '/tmp/P3WAdJKqfV/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/highwayhash/arch_specific.h"
  #include "/usr/include/highwayhash/c_bindings.h"
  #include "/usr/include/highwayhash/compiler_specific.h"
  #include "/usr/include/highwayhash/data_parallel.h"
  #include "/usr/include/highwayhash/endianess.h"
  #include "/usr/include/highwayhash/hh_avx2.h"
  #include "/usr/include/highwayhash/hh_buffer.h"
  #include "/usr/include/highwayhash/hh_neon.h"
  #include "/usr/include/highwayhash/hh_portable.h"
  #include "/usr/include/highwayhash/hh_sse41.h"
  #include "/usr/include/highwayhash/hh_types.h"
  #include "/usr/include/highwayhash/hh_vsx.h"
  #include "/usr/include/highwayhash/highwayhash.h"
  #include "/usr/include/highwayhash/highwayhash_target.h"
  #include "/usr/include/highwayhash/highwayhash_test_target.h"
  #include "/usr/include/highwayhash/iaca.h"
  #include "/usr/include/highwayhash/instruction_sets.h"
  #include "/usr/include/highwayhash/load3.h"
  #include "/usr/include/highwayhash/nanobenchmark.h"
  #include "/usr/include/highwayhash/os_mac.h"
  #include "/usr/include/highwayhash/os_specific.h"
  #include "/usr/include/highwayhash/profiler.h"
  #include "/usr/include/highwayhash/robust_statistics.h"
  #include "/usr/include/highwayhash/scalar.h"
  #include "/usr/include/highwayhash/scalar_sip_tree_hash.h"
  #include "/usr/include/highwayhash/sip_hash.h"
  #include "/usr/include/highwayhash/sip_tree_hash.h"
  #include "/usr/include/highwayhash/state_helpers.h"
  #include "/usr/include/highwayhash/tsc_timer.h"
  #include "/usr/include/highwayhash/vector128.h"
  #include "/usr/include/highwayhash/vector256.h"
  #include "/usr/include/highwayhash/vector_neon.h"
  #include "/usr/include/highwayhash/vector_test_target.h"

  // add namespaces
  namespace highwayhash{typedef int tmp_add_type_1;}
  highwayhash::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace highwayhash{namespace Portable{typedef int tmp_add_type_2;}}
  highwayhash::Portable::tmp_add_type_2 tmp_add_func_2(){return 0;};

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/P3WAdJKqfV/dump1.h"

In file included from /usr/include/highwayhash/hh_buffer.h:28,
                 from /usr/include/highwayhash/hh_avx2.h:25,
                 from /tmp/P3WAdJKqfV/dump1.h:17:
/usr/include/highwayhash/vector128.h:51:10: fatal error: smmintrin.h: No such file or directory
   51 | #include <smmintrin.h>  // SSE4.1
      |          ^~~~~~~~~~~~~
compilation terminated.