Temporary header file '/tmp/rka7GWahEZ/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
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/oauth2/cache.h"
  #include "/usr/include/oauth2/cfg.h"
  #include "/usr/include/oauth2/http.h"
  #include "/usr/include/oauth2/ipc.h"
  #include "/usr/include/oauth2/jose.h"
  #include "/usr/include/oauth2/log.h"
  #include "/usr/include/oauth2/mem.h"
  #include "/usr/include/oauth2/oauth2.h"
  #include "/usr/include/oauth2/openidc.h"
  #include "/usr/include/oauth2/proto.h"
  #include "/usr/include/oauth2/session.h"
  #include "/usr/include/oauth2/util.h"
  #include "/usr/include/oauth2/version.h"

  // add classes
  ASN1_ENCODING_st* tmp_add_class_0;
  BIO_sock_info_u* tmp_add_class_1;
  BIT_STRING_BITNAME_st* tmp_add_class_2;
  _G_fpos64_t* tmp_add_class_3;
  _G_fpos_t* tmp_add_class_4;
  _IO_cookie_io_functions_t* tmp_add_class_5;
  asn1_string_st* tmp_add_class_6;
  asn1_string_table_st* tmp_add_class_7;
  asn1_type_st* tmp_add_class_8;
  crypto_ex_data_st* tmp_add_class_9;
  crypto_threadid_st* tmp_add_class_10;
  json_error_t* tmp_add_class_11;
  json_t* tmp_add_class_12;
  oauth2_cache_type_t* tmp_add_class_13;
  oauth2_cfg_server_callback_funcs_t* tmp_add_class_14;
  oauth2_cfg_token_in_basic_t* tmp_add_class_15;
  oauth2_cfg_token_in_cookie_t* tmp_add_class_16;
  oauth2_cfg_token_in_envvar_t* tmp_add_class_17;
  oauth2_cfg_token_in_header_t* tmp_add_class_18;
  oauth2_cfg_token_in_post_t* tmp_add_class_19;
  oauth2_cfg_token_in_t* tmp_add_class_20;
  oauth2_token_in_query_t* tmp_add_class_21;
  ossl_algorithm_st* tmp_add_class_22;
  ossl_dispatch_st* tmp_add_class_23;
  ossl_item_st* tmp_add_class_24;
  ossl_param_st* tmp_add_class_25;
  rsa_oaep_params_st* tmp_add_class_26;
  rsa_pss_params_st* tmp_add_class_27;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/rka7GWahEZ/dump1.h"