'Command Line Optimization Level in NASM

I have written an assembly code to add ten numbers using byte variables, and code is error free.

Assembly code:

 ; a program to add ten numbers using byte variables
[org 0x0100]

jmp start 
num1: dw   10, 20, 30, 40, 50, 10, 20, 30, 40, 50
result: dw 0 

start: 
    ; initialize stuff 
    mov  ax, 0              ; reset the accumulator 
    mov  bx, 0              ; set the counter   
    outerloop: 
        add  ax, [num1 + bx]
        add  bx, 2
        cmp bx, 20          ; sets ZF=1 when they are equal, 
                            ;un set ZF=0, if they are not equal  
        jne  outerloop 
    mov  [result], ax


    mov  ax, 0x4c00
    int  0x21

While assembling this code in NASM facing this error.

enter image description here

assemblynasm


Solution 1:[1]

NASM's command line options are case sensitive. It looks like you wanted to use the -o option (lower case o) to specify the output file name, so that -o C02-06.COM would write the output to a file named C02-06.COM. Instead you used upper-case -O, which requests optimization and (with your version) requires an additional flag, as the message says.

So change your command to -o C02-06.COM and it should work.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Nate Eldredge

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