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Index > Windows > Using GCC (ld.exe) linking issue

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magic



Joined: 17 Jan 2006
Posts: 3
magic
Hi can someone help me on this matter. I create a win32 asm program that will call another function in another win32 asm file. Both will be in ELF format. I link them using GCC(ld.exe) tool but fail. This is my code

For main file name main.asm:
Code:
format ELF

include 'win32a.inc'

  extrn '__imp__MessageBoxA@16' as MessageBox:dword
     extrn '__imp__ExitProcess@4' as ExitProcess:dword
     extrn '_myInfoBox@4' as myInfoBox:dword

section '.data' writeable

        title   db      'Title',0
 info    db      'Testing String',0

section '.code' executable writeable

      public _WinStart
    _WinStart:
                      invoke  MessageBox,     0,info,title,0  
                    push info
                   call myInfoBox
                      invoke  ExitProcess,    0
    


The error is;
Undefined refrence to '__imp__ExitProcess@4'
For me its should not error because I already refrence it in main file.


Last edited by magic on 11 Dec 2012, 18:06; edited 1 time in total
Post 10 Dec 2012, 18:41
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HaHaAnonymous



Joined: 02 Dec 2012
Posts: 1180
Location: Unknown
HaHaAnonymous
[ Post removed by author. ]


Last edited by HaHaAnonymous on 28 Feb 2015, 22:12; edited 1 time in total
Post 10 Dec 2012, 22:29
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17271
Location: In your JS exploiting you and your system
revolution
For a linkable Windows output (an object file) you would use either "format coff" or "format ms coff".
Post 11 Dec 2012, 00:38
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HaHaAnonymous



Joined: 02 Dec 2012
Posts: 1180
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HaHaAnonymous
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Last edited by HaHaAnonymous on 28 Feb 2015, 22:12; edited 1 time in total
Post 11 Dec 2012, 00:52
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khatch



Joined: 24 Oct 2011
Posts: 68
khatch
Hello.
The answer is:
Code:
format ELF

;include 'win32a.inc'

        extrn '__imp__MessageBoxA@16' as MessageBox:dword
     extrn '__imp__ExitProcess@4' as ExitProcess:dword
;        extrn '_myInfoBox@4' as myInfoBox:dword
extrn ___main  ;                  ; for mingw32

section '.data' writeable

 title   db      'Title',0
 info    db      'Testing String',0

section '.code' executable writeable

;        public _WinStart
;        _WinStart:
include 'win32a.inc'
public _main
_main:
                      call ___main    ; for mingw32
                       invoke  MessageBox,     0,info,title,0
;                        push info
;                        call myInfoBox
                     invoke  ExitProcess,    0 
    

And then:
gcc main.o -o final_GUI.exe -Wl,--subsystem=windows

gcc main.o -o final_CONSOLE.exe -Wl,--subsystem=console

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Post 22 Dec 2012, 14:39
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