Todd Vierling (tv@pobox.com) suggested the following test for ELFness.
Seems pretty portable to me.
Thus spake Todd Vierling (tv@pobox.com)
>On NetBSD, the following will do it. This may even be platform independednt
>if "grep -q" is replaced by "grep >/dev/null 2>&1".
>
>if echo __ELF__ | ${CC} -E - | grep -q __ELF__; then
> ... a.out action ...
>else
> ... ELF action ...
>fi
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