Must main return a value?

[Doug Gwyn]

In article <7830001 at hpwrce.HP.COM> walterm at hpwrce.HP.COM (Walter Murray) writes:
>Many people have written that the main function must return a value.
>I can't find such a requirement in the Standard.  I have read 2.1.2.2.3
>and 3.6.6.4.  Am I missing something?

You must be -- 2.1.2.2.3 states explicitly "If the main function executes a
return that specifies no value, the termination status returned to the host
environment is undefined."  That meets the condition for causing undefined
behavior on at least two counts.