Temporary header file '/tmp/ZPJCCL9Hql/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _TIME_BITS 64
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#ifdef __cplusplus
// C17 compat layer
#define _Alignof(type) alignof(type)
#endif
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/mimetic/body.h"
  #include "/usr/include/mimetic/circular_buffer.h"
  #include "/usr/include/mimetic/codec/base64.h"
  #include "/usr/include/mimetic/codec/code.h"
  #include "/usr/include/mimetic/codec/codec.h"
  #include "/usr/include/mimetic/codec/codec_base.h"
  #include "/usr/include/mimetic/codec/codec_chain.h"
  #include "/usr/include/mimetic/codec/other_codecs.h"
  #include "/usr/include/mimetic/codec/qp.h"
  #include "/usr/include/mimetic/contentdescription.h"
  #include "/usr/include/mimetic/contentdisposition.h"
  #include "/usr/include/mimetic/contentid.h"
  #include "/usr/include/mimetic/contenttransferencoding.h"
  #include "/usr/include/mimetic/contenttype.h"
  #include "/usr/include/mimetic/fieldparam.h"
  #include "/usr/include/mimetic/header.h"
  #include "/usr/include/mimetic/libconfig.h"
  #include "/usr/include/mimetic/message.h"
  #include "/usr/include/mimetic/mimeentity.h"
  #include "/usr/include/mimetic/mimeentitylist.h"
  #include "/usr/include/mimetic/mimetic.h"
  #include "/usr/include/mimetic/mimeversion.h"
  #include "/usr/include/mimetic/os/file.h"
  #include "/usr/include/mimetic/os/file_iterator.h"
  #include "/usr/include/mimetic/os/fileop.h"
  #include "/usr/include/mimetic/os/mmfile.h"
  #include "/usr/include/mimetic/os/os.h"
  #include "/usr/include/mimetic/os/stdfile.h"
  #include "/usr/include/mimetic/os/utils.h"
  #include "/usr/include/mimetic/parser/itparser.h"
  #include "/usr/include/mimetic/parser/itparserdecl.h"
  #include "/usr/include/mimetic/rfc822/address.h"
  #include "/usr/include/mimetic/rfc822/addresslist.h"
  #include "/usr/include/mimetic/rfc822/body.h"
  #include "/usr/include/mimetic/rfc822/datetime.h"
  #include "/usr/include/mimetic/rfc822/field.h"
  #include "/usr/include/mimetic/rfc822/fieldvalue.h"
  #include "/usr/include/mimetic/rfc822/group.h"
  #include "/usr/include/mimetic/rfc822/header.h"
  #include "/usr/include/mimetic/rfc822/mailbox.h"
  #include "/usr/include/mimetic/rfc822/mailboxlist.h"
  #include "/usr/include/mimetic/rfc822/message.h"
  #include "/usr/include/mimetic/rfc822/messageid.h"
  #include "/usr/include/mimetic/rfc822/rfc822.h"
  #include "/usr/include/mimetic/streambufs.h"
  #include "/usr/include/mimetic/strutils.h"
  #include "/usr/include/mimetic/tokenizer.h"
  #include "/usr/include/mimetic/tree.h"
  #include "/usr/include/mimetic/utils.h"
  #include "/usr/include/mimetic/version.h"

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

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;
  f_owner_ex* tmp_add_class_3;
  file_handle* tmp_add_class_4;
  flock64* tmp_add_class_5;
  iovec* tmp_add_class_6;
  newline_traits* tmp_add_class_7;
  statx_timestamp* tmp_add_class_8;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/ZPJCCL9Hql/dump1.h"