In the process of porting an HP-UX C++ application over to LINUX, I've noticed that there was a function of type int where not all code paths appear to return an integer value. When I compile and run the application under HP-UX (using the acc compiler for compilation), it returns a 0 through a codepath that does not explicitly state a return value. However, when I compile and run the same application under LINUX, I get a return value of -72 and the application presents an error consequently (this is intended when the return value is less than 0). I've noticed that classic C++ (a very old and outdated standard which the ACC compiler supports) deals with variable scoping a bit differently from standard C++ (which ACC unfortunately does not support). In classic C++, it appears that declaring an integer inside a forloop declaration

```
for( int index = 0; index < array.length; index++ )

```

the variable index is accessible outside the forloop, although I wouldn't know for sure whether the return statements are dealt with in the same way such that aCC recognizes that all code paths return a value.

The function i'm dealing with is available below:

```
int process_phase (const char *phase, const char *seg_type, const char *dist_target, const char *action_target, char *cmd) 
{
  char cmd2[MAX_STRING];

  printf( "I AM INSIDE THE PROCESS_PHASE\n" );

  if (TRACE_MODE) 
  {
    printf ("%s %s\n", MSG_LOOKUP("MSG_PHASE"), phase);
    printf ("%s %s\n", MSG_LOOKUP("MSG_SEG_TYPE"), seg_type);
    printf ("%s %s\n", MSG_LOOKUP("MSG_DIST_TARGET"), dist_target);
    printf ("%s %s\n", MSG_LOOKUP("MSG_ACTION_TARGET"), action_target);
    printf ("%s %s\n", MSG_LOOKUP("MSG_CMD"), cmd);
  }

  // Remove the pre- and post- prefixes
  const char *phase_ref = strchr(phase, '-');

  printf ("PHASE REF BEFORE PREFIX REMOVAL: %s\n", phase_ref );

  if (phase_ref) 
  {
    phase_ref++; 
  }
  else
  {
    phase_ref = phase;
  }

  printf ("PHASE REF AFTER PREFIX REMOVAL: %s\n", phase_ref );

  if (TRACE_MODE)
  {
    printf ("%s %s\n", MSG_LOOKUP("MSG_PHASE_REF"), phase_ref);
  }

  printf ( "==========TEST PHASE 1 BEGIN==========\n" );

  if (strcasecmp(phase_ref, "all_phases") != 0) 
  {
    if (DO_TRANSFER && strcasecmp(phase_ref, "transfer") != 0) 
    {
      printf ("IN ONE\n");
      return 0;
    }
    else if (DO_TAPE_GENERATION && strcasecmp(phase_ref, "tape_generation") != 0) 
    {
      printf ("IN TWO\n");
      return 0;
    }
    else if (DO_TAPE_EXTRACTION && strcasecmp(phase_ref, "tape_extraction") != 0) 
    {
      printf ("IN THREE\n");
      return 0;
    }
    else if (DO_PREPARATION && strcasecmp(phase_ref, "preparation") != 0)
    {
      printf ("IN FOUR\n");
      return 0;
    }
    else if (DO_DISTRIBUTION && strcasecmp(phase_ref, "distribution") != 0)
    {
      printf ("IN FIVE\n");
      return 0;
    }
    else if (DO_VERIFICATION && strcasecmp(phase_ref, "verification") != 0)
    { 
      printf ("IN SIX\n");
      return 0;
    }
    else if (DO_ACTIVATION && strcasecmp(phase_ref, "activation") != 0) 
    {
      printf ("IN SEVEN\n");
      return 0;
    }
    else if (DO_REMOVAL && strcasecmp(phase_ref, "removal") != 0)
    {
      printf ("IN EIGHT\n");
      return 0;
    }
  }

  printf ( "==========TEST PHASE 1 END==========\n" );

  // if (strstr(seg_type, envvar("SEGMENT_TYPE")) == 0 && strcasecmp(seg_type, "ALL") !=0) return 0;
  char tmp_seg_type[MAX_BUFFLEN];
  sprintf (tmp_seg_type, "_%s_", seg_type);

  printf( "tmp_seg_type: %s\n", tmp_seg_type );

  char tmp_envar_seg_type[MAX_BUFFLEN];
  sprintf (tmp_envar_seg_type, "_%s_", envvar("SEGMENT_TYPE"));

  printf( "tmp_seg_type: %s\n", tmp_seg_type );

  if ( strstr(tmp_seg_type, tmp_envar_seg_type) == 0 && strcasecmp(seg_type, "ALL") != 0 )
  {
    printf( "IN TEST PHASE TWO\n" );
    return 0;
  }

  char match_list[MAX_BUFFLEN];

  printf ( "==========TEST PHASE THREE BEGIN==========\n" );

  if ( DO_TRANSFER ) 
  {
    printf( "IN ONE\n" );
    sprintf( match_list, "DIST_NODES", dist_target );
  }
  else if (DO_TAPE_GENERATION) 
  {
    printf( "IN TWO\n" );
    sprintf( match_list, "HOST_NODES", dist_target );
  }
  else
  {
    printf( "IN THREE\n" );
    sprintf( match_list, "%s_NODES", dist_target );
    printf( "match_list: %s\n", match_list );
  }

  printf ( "==========TEST PHASE THREE END==========\n" );

  char matched_nodes[MAX_BUFFLEN];
  get_env(match_list, matched_nodes);

  printf( "matched_nodes: %s\n", matched_nodes );

  word_sort_unique(matched_nodes);

  printf( "sorted_matched_nodes: %s\n", matched_nodes );

  const char *element_separator = " ";
  const char *curr_node_type;
  char *curr_node = strtok(matched_nodes, element_separator);

  printf( "curr_node: %s\n", curr_node );

  int whileiteration = 0;

 while (curr_node) 
 {
    printf( "WHILE LOOP ITERATION: %d\n", whileiteration );

    int node_idx;
    bool matched = false;

    for (node_idx=0; node_idx<node_count; node_idx++) 
    {
      if (strcmp(curr_node, node_table[node_idx]) == 0) 
      {
        matched = true;
        break;
      }
    }

    if (matched) 
    {
      if (strcasecmp(action_target, "TARGET") == 0) 
      {
        if (indent[node_idx][0] == 0) 
        {
          fprintf (outfile[node_idx], "remsh %s \"\n", curr_node);
          indent[node_idx] = "  ";
          fprintf (outfile[node_idx], "%s. %s/site_profile\n", indent[node_idx], envvar ("TOOLS_DIR"));
          fprintf (outfile[node_idx], "%s. %s/install_profile\n", indent[node_idx], envvar ("TOOLS_DIR"));
          fprintf (outfile[node_idx], "%sexport LANG=%s\n", indent[node_idx], envvar ("LANG"));
        }
      } 
      else 
      {
        // Input redirection from /dev/echo enables that the ports reserved for remsh on both client and
        // server node get released immediately without any inactivity timeout period
        if (indent[node_idx][0] != 0) 
        {
          fprintf (outfile[node_idx], "\" < /dev/echo \n");
        }
        indent[node_idx] = "";
      }

      // Do parameter substitution
      strcpy(cmd2, cmd);
      expand_string (cmd2, "$BUILD_VERSION", BUILD_VERSION);
      expand_string (cmd2, "${BUILD_VERSION}", BUILD_VERSION);
      expand_string (cmd2, "$TARGET_NODE", curr_node);
      expand_string (cmd2, "${TARGET_NODE}", curr_node);
      curr_node_type = target_lookup (curr_node);      
      expand_string (cmd2, "$NODE_TYPE", curr_node_type);
      expand_string (cmd2, "${NODE_TYPE}", curr_node_type);

      fprintf(outfile[node_idx], "%s%s\n", indent[node_idx], cmd2);
      file_active[node_idx] = true;
    }
    curr_node = strtok(NULL, element_separator);

    whileiteration++;
  }
  printf ( "EXITING PROCESS PHASE\n" );
}

```

I've use code instrumentation to print out variables and other output on HP-UX and LINUX up until the while loop and they appear to be the same. Under certain circumstances, even when the while loop is ignored because the variable curr\_node is null and the function is exited, where EXITING PROCESS PHASE is printed to stdout, the output is the same between HP-UX and LINUX. However, the return values between HP-UX and LINUX is completely different. What I can't figure out is why.