Temporary header file '/tmp/aO9EULQOtL/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)

  // add includes
  #include "/usr/include/biosquid/squid.h"
  #include "/usr/include/biosquid/dirichlet.h"
  #include "/usr/include/biosquid/gki.h"
  #include "/usr/include/biosquid/msa.h"
  #include "/usr/include/biosquid/rk.h"
  #include "/usr/include/biosquid/sqfuncs.h"
  #include "/usr/include/biosquid/squidconf.h"
  #include "/usr/include/biosquid/sre_random.h"
  #include "/usr/include/biosquid/sre_stack.h"
  #include "/usr/include/biosquid/ssi.h"
  #include "/usr/include/biosquid/stopwatch.h"
  #include "/usr/include/biosquid/vectorops.h"

  // add classes
  ReadSeqVars* tmp_add_class_0;
  _G_fpos64_t* tmp_add_class_1;
  _G_fpos_t* tmp_add_class_2;
  _IO_cookie_io_functions_t* tmp_add_class_3;
  aliinfo_s* tmp_add_class_4;
  cstack_s* tmp_add_class_5;
  gki_elem* tmp_add_class_6;
  intstack_s* tmp_add_class_7;
  iupactype* tmp_add_class_8;
  mixdchlet_s* tmp_add_class_9;
  msa_struct* tmp_add_class_10;
  msafile_struct* tmp_add_class_11;
  mstack_s* tmp_add_class_12;
  nstack_s* tmp_add_class_13;
  opt_s* tmp_add_class_14;
  phylo_s* tmp_add_class_15;
  seqinfo_s* tmp_add_class_16;
  sqd_regexp* tmp_add_class_17;
  ssifile_s* tmp_add_class_18;
  ssiindex_s* tmp_add_class_19;
  ssioffset_s* tmp_add_class_20;
  ssipkey_s* tmp_add_class_21;
  ssiskey_s* tmp_add_class_22;
  stopwatch_s* tmp_add_class_23;
  tms* tmp_add_class_24;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/aO9EULQOtL/dump1.h"