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

  // add defines
  #define __STDC_VERSION__ 201710L
#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) 
typedef float _Float32;
typedef long double _Float64;
typedef double _Float32x;

  // add includes
  #include "/usr/include/sylph/account.h"
  #include "/usr/include/sylph/base64.h"
  #include "/usr/include/sylph/codeconv.h"
  #include "/usr/include/sylph/compose.h"
  #include "/usr/include/sylph/customheader.h"
  #include "/usr/include/sylph/defs.h"
  #include "/usr/include/sylph/displayheader.h"
  #include "/usr/include/sylph/enums.h"
  #include "/usr/include/sylph/filter.h"
  #include "/usr/include/sylph/folder.h"
  #include "/usr/include/sylph/html.h"
  #include "/usr/include/sylph/imap.h"
  #include "/usr/include/sylph/mbox.h"
  #include "/usr/include/sylph/md5.h"
  #include "/usr/include/sylph/md5_hmac.h"
  #include "/usr/include/sylph/mh.h"
  #include "/usr/include/sylph/news.h"
  #include "/usr/include/sylph/nntp.h"
  #include "/usr/include/sylph/pop.h"
  #include "/usr/include/sylph/prefs.h"
  #include "/usr/include/sylph/prefs_account.h"
  #include "/usr/include/sylph/prefs_common.h"
  #include "/usr/include/sylph/procheader.h"
  #include "/usr/include/sylph/procmime.h"
  #include "/usr/include/sylph/procmsg.h"
  #include "/usr/include/sylph/quoted-printable.h"
  #include "/usr/include/sylph/recv.h"
  #include "/usr/include/sylph/session.h"
  #include "/usr/include/sylph/smtp.h"
  #include "/usr/include/sylph/socket.h"
  #include "/usr/include/sylph/ssl.h"
  #include "/usr/include/sylph/stringtable.h"
  #include "/usr/include/sylph/sylmain.h"
  #include "/usr/include/sylph/unmime.h"
  #include "/usr/include/sylph/utils.h"
  #include "/usr/include/sylph/uuencode.h"
  #include "/usr/include/sylph/virtual.h"
  #include "/usr/include/sylph/xml.h"

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