CODEWITHSUNDEEP
linuxassemblyx86gnu-assembler
Othman H
Othman H

Reputation: 75

x86 Assembly with gas on linux: multiple definitions of 'main'

I'm starting out with programming in Assembly in x86 and I'm following a guide for that. I'm using gas to compile on a linux virtual machine.

I'm trying to run a simple empty program where main routine exits the program immediately. That's the first task in the guide I'm following. My code is saved in a file hello.s and it looks like this:

.global main

main:
  movq   %rsp, %rbp
  mov   $0, %rdi
  call   exit

In the terminal I navigate to the directory of the file and try to run it like this:

gcc -o hello.o hello.s -no-pie ./hello.s

I get an error saying:

/tmp/cc62hr1F.o: In function 'main':
(.text+0x0): multiple definition of 'main'
/tmp/ccwMutY1.o(.text+0x0): first defined here
collect2: error: ld returned 1 exit status

What does this error mean and how to fix it? Thank you in advance.

Upvotes: 1

Views: 510

Answers (1)

Othman H
Othman H

Reputation: 75

EDIT/SOLUTION: I figured out what was wrong. In the terminal I should run it like this:

gcc -o hello.o hello.s -no-pie
./hello.o

These are two seperate commands. I wrote them in one line. And the file to run has to have the extensions .o not .s

Upvotes: 1

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