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Date: Tue, 30 Aug 2005 13:37:02 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Jonathon McKitrick <jcm@FreeBSD-uk.eu.org>
Message-ID: <20050830103702.GA80388@orion.daedalusnetworks.priv>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Linking standalone NASM binary with libc
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On 2005-08-30 04:29, Jonathon McKitrick <jcm@FreeBSD-uk.eu.org> wrote:
>
> I'm doing some experimentation with assembly code based on the int80h.org
> tutorials.  But since I am going to use malloc and some other functions,
> I need to make my code link with libc rather than stand totally on its own.
>
> ld -s -o foo foo.o -lc
>
> leaves 'environ' and '__progname' undefined.  What is the correct way to link
> standalone asm code with needed libraries?

That depends on what the ``standalone'' code contains.  If your foo.o
object file defines a 'main' function, then you can just use cc(1):

      % tesla:/tmp/foo$ cat -n foo.asm
      %      1          global main
      %      2  main:
      %      3          mov eax,1               ; exit() syscall
      %      4          mov ebx,1               ; exit code
      %      5          int 0x80                ; trap into kernel
      % tesla:/tmp/foo$ nasm -f elf -o foo.o foo.asm
==>   % tesla:/tmp/foo$ cc -o foo foo.o
      % tesla:/tmp/foo$ ./foo
      % tesla:/tmp/foo$ echo $?
      % 1
      % tesla:/tmp/foo$