-coff, -elf, -aout

[Naveen Malik]

Hi,

when making a cross compiler from gcc we have three
options  -coff, -elf, -aout that generate a cross compiler that gives us the
binaries that are indipendent of any OS support.  Can anybody please help me
in understanding - what is the difference between these three options as all
of them are used to generate code for embedded applications but whaich
option to use?

OR where I can get the reference material for al these issues for defining
target.

Best regards

Naveen Malik