No string literals or comments:
Split over two lines, but one would work fine as well.
When compiled using gcc on Linux (x86-64), this produces an executable which exits with success (exit code 0), the same as the
true Unix utility; this being how I choose to interpret the requirement of returning boolean
true in a non-scripting language.
Note: notwithstanding the abuse of the "implicit int" rule, the principal trick behind this program is that while a C program that falls off the end of
main without a
return statement will usually result in a non zero exit code, by calling another function we can set the
EAX register which is then used as the exit code of the program. This is of course totally undefined behaviour and utterly non portable.