Can't add more variables in 8051 program - Stack Overflow

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I'm running into a situation where I seem to be on the edge of having enough variable space. I don't know if I'm running into a limit in SDCC, or how to handle this or check where the issue is located.

The microcontroller is an STC89c58RD+ at 11.0592Mhz.

I compile using the line below, it works until I add line 130 in main.c, this takes it over the edge, I compile without an error, yet this will only run upto 130 and it will "stop". If I comment out line 130, the code runs again, if I add another variable for the SD card driver I ported, it does the same thing, just stops and appears to have "left the planet", no indications of activity.

sdcc --debug --std-sdcc23 --iram-size 256 --xram-size 1280 --code-size 32512  --nooverlay --model-large main.c -o mainL.ihx SDtestL.lib oledL.lib -L ..\..\00_SDCCnewLibs -I ..\..\00_SDCCnewLibs

Internal RAM layout:
      0 1 2 3 4 5 6 7 8 9 A B C D E F
0x00:|0|0|0|0|0|0|0|0|a|a|a|a|a|a|a|a|
0x10:|a|a|a|a|b|b|b|b|b|b|b|b|b|c|f| |
0x20:|B|d|d|d|d|d|d|d|d|e|e|e|e|Q|Q|Q|
0x30:|Q|I|I|I|I|I|I|I|I|I|I|I|I|S|S|S|
0x40:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x50:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x60:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x70:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x80:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x90:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xa0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xb0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xc0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xd0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xe0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xf0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0-3:Reg Banks, T:Bit regs, a-z:Data, B:Bits, Q:Overlay, I:iData, S:Stack, A:Absolute

Stack starts at: 0x3d (sp set to 0x3c) with 195 bytes available.  
The largest spare internal RAM space starts at 0x1f with 1 byte available.

Other memory:
   Name             Start    End      Size     Max     
   ---------------- -------- -------- -------- --------
   PAGED EXT. RAM                         0      256   
   EXTERNAL RAM     0x0001   0x00b4     180     1280   
   ROM/EPROM/FLASH  0x0000   0x21a9    8618    32512   

Enabling line 130, which is a call to a function returning a humidity and temperature. When this is enabled, memory is per below, I believe that I am in the range of memory available but I'm not allowed the extra variable. I'm trying to figure out if XRAM is not working for this chip, the checkbox in STC-ISP is enabled for XRAM. It looks like I should have more variable room as I have compiled for Large which should push all variables to XRAM (XDATA).

Internal RAM layout:
      0 1 2 3 4 5 6 7 8 9 A B C D E F
0x00:|0|0|0|0|0|0|0|0|a|a|a|a|a|a|a|a|
0x10:|a|a|a|a|b|b|b|b|b|b|b|b|b|c|f| |
0x20:|B|d|d|d|d|d|d|d|d|e|e|e|e|Q|Q|Q|
0x30:|Q|I|I|I|I|I|I|I|I|I|I|I|I|S|S|S|
0x40:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x50:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x60:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x70:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x80:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0x90:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xa0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xb0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xc0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xd0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xe0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0xf0:|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|S|
0-3:Reg Banks, T:Bit regs, a-z:Data, B:Bits, Q:Overlay, I:iData, S:Stack, A:Absolute

Stack starts at: 0x3d (sp set to 0x3c) with 195 bytes available.
The largest spare internal RAM space starts at 0x1f with 1 byte available.

Other memory:
   Name             Start    End      Size     Max     
   ---------------- -------- -------- -------- --------
   PAGED EXT. RAM                         0      256   
   EXTERNAL RAM     0x0001   0x00c3     195     1280   
   ROM/EPROM/FLASH  0x0000   0x23a6    9127    32512   

I have tried to add different variables or calls to other functions, these are working functions but adding either variables or function calls, the code will stop on the line added. I debug with a putchar() before and after, the before message comes out, the putchar() after the variable is never seen. I've looked around and found messages to a stack issue, but I don't get the errors related to a stack failure in the .mem file, but it feels like something like this is the issue. I need some shots on how to solve this. From the .mem file, I'm not running out of memory, which makes this more confusing.

Compile line:

sdcc --debug --std-sdcc99 --model-large main.c -o mainL.ihx oledL.lib -L ..\..\00_SDCCnewLibs -I ..\..\00_SDCCnewLibs  

Test code that breaks:

    //..section of a loop to read temperature and display it

    OLED3_DisplayNumber(10, i, 2);
    DELAY_ms(400);
    cksum = DHT_GetData( & dht); // <-- going to this function is where it stops

Part of the function called:

    //..part of the function being called from a library (compiled '--model-large'

    int DHT_GetData(dht_t *dht) {
    
    DELAY_ms(200);          //wait 200 ms for stable signal
    Request();              // send start pulse
    Response();             // receive response

    I_RH = Receive_data();  // have to read then send to struct, timing issue
    D_RH = Receive_data();  // store next eight bit in D_RH
    I_Temp = Receive_data();    // store next eight bit in I_Temp
    D_Temp = Receive_data();    // store next eight bit in D_Temp
    CheckSum = Receive_data();

    dht->h1 = I_RH;         // store first eight bit in I_RH dht->h1;
    dht->h2 = D_RH;         // store next eight bit in D_RH
    dht->t1 = I_Temp;           // store next eight bit in I_Temp
    dht->t2 = D_Temp;           // store next eight bit in D_Temp
    dht->crc1 = CheckSum;       // store next eight bit in CheckSum

    if ((I_RH + D_RH + I_Temp + D_Temp) != CheckSum) {
        return (99);
    } else {
        return (CheckSum);

After some feedback, the issue appears to be related somehow to compiling with --model-large, the code always worked with --model-small.

The question I seem to need to figure out is what happens with going to --model-large, I will need to figure out this step. The next step will be adding an SD driver/library which will increase number of variables. Will the 8051/SDCC be able to do this, I'm still optimistic?

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