GCC C语言处理主要函数之c_common_init

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c_common_init:

/* Front end initialization common to C, ObjC and C++.  */bool c_common_init (void){  /* Set up preprocessor arithmetic.  Must be done after call to     c_common_nodes_and_builtins for type nodes to be good.  */  cpp_opts->precision = TYPE_PRECISION (intmax_type_node);  cpp_opts->char_precision = TYPE_PRECISION (char_type_node);  cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);  cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);  cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);  cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
  /* This can't happen until after wchar_precision and bytes_big_endian     are known.  */  cpp_init_iconv (parse_in);
  if (version_flag)    {      int i;      fputs ("Compiler executable checksum: ", stderr);      for (i = 0; i < 16; i++) fprintf (stderr, "%02x", executable_checksum[i]);      putc ('\n', stderr);    }
  /* Has to wait until now so that cpplib has its hash table.  */  init_pragma ();
  if (flag_preprocess_only)    {      c_finish_options ();      preprocess_file (parse_in);      return false;    }
  return true;}

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