global variables?

[Peter Johnson]

On Sat, 27 May 2006, Nic Reveles wrote:

<SNIP code>

> I copied this from a website teaching Unix assembly in comparison with dos 
> assembly.
>
> yasm -m amd64 -o hello_world hello_world.asm
> hello_world.asm:8: warning: binary object format does not support global 
> variables

This looks like an example for Unix assembly; Unix requires two steps (the 
book should be telling you this), first assembly, then linking.  This 
requires an intermediate relocatable object file like ELF, not BIN. 
Also, the code given is standard x86 code, not AMD64 code.  The correct 
sequence to assemble, link, and run should be something like:

yasm -f elf hello_world.asm       <-- generates hello_world.o
gcc -o hello_world hello_world.o  <-- generates hello_world by calling the
                                       linker (ld)
./hello_world

-- 
Peter