arch linux gcc 32-bit libraries c assembly

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Tags: c assembly pacman archlinux

I wanted to compile my C code with gcc -m32 so I could easily follow old C and assembly tutorials, but it required 32-bit gcc libraries which are not available by default in an Arch Linux installation.

From the ArchWiki:

To use the multilib repository, uncomment the [multilib] section in /etc/pacman.conf (Please be sure to uncomment both lines):

After editing my /etc/pacman.conf, I ran pacman -Syu to update the (not yet cached) package list from the multilib repository. Then I installed the package I needed.

# pacman -S lib32-gcc-libs

Now I can compile my C code for 32-bit machines

$ gcc -fverbose-asm -g -m32 -O0 -o $dest -c $src

To get the assembly code for the produced object file with Intel notation:

$ objdump -dS -M intel $dest
Disassembly of section .text:

00000000 <main>:
#include <stdio.h>

int main(void)
   0:	8d 4c 24 04          	lea    ecx,[esp+0x4]
   4:	83 e4 f0             	and    esp,0xfffffff0
   7:	ff 71 fc             	push   DWORD PTR [ecx-0x4]
   a:	55                   	push   ebp
   b:	89 e5                	mov    ebp,esp
   d:	53                   	push   ebx
   e:	51                   	push   ecx
   f:	83 ec 10             	sub    esp,0x10
  12:	e8 fc ff ff ff       	call   13 <main+0x13>
  17:	05 01 00 00 00       	add    eax,0x1
  int i = 1;
  1c:	c7 45 f4 01 00 00 00 	mov    DWORD PTR [ebp-0xc],0x1
  printf("%i\n", i);
  23:	83 ec 08             	sub    esp,0x8
  26:	ff 75 f4             	push   DWORD PTR [ebp-0xc]
  29:	8d 90 00 00 00 00    	lea    edx,[eax+0x0]
  2f:	52                   	push   edx
  30:	89 c3                	mov    ebx,eax
  32:	e8 fc ff ff ff       	call   33 <main+0x33>
  37:	83 c4 10             	add    esp,0x10
  return 0;
  3a:	b8 00 00 00 00       	mov    eax,0x0
  3f:	8d 65 f8             	lea    esp,[ebp-0x8]
  42:	59                   	pop    ecx
  43:	5b                   	pop    ebx
  44:	5d                   	pop    ebp
  45:	8d 61 fc             	lea    esp,[ecx-0x4]
  48:	c3                   	ret


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