🚀 go-pugleaf

In <4jpj9l$ik9@cnn.Princeton.EDU> tim@franck (Tim Hollebeek) writes:

>Just out of curiosity, is this legal?
>
>int main() {
>    int x = x;
>    return 0;
>}

ANSI classic 1.6:

 * Undefined behavior --- behavior, upon use of a nonportable or
   erroneous program construct, of erroneous data, or of
   indeterminately-valued objects, for which the Standard imposes no
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   requirements.  Permissible undefined behavior ranges from ignoring the
   situation completely with unpredictable results, to behaving during
   translation or program execution in a documented manner characteristic
   of the environment (with or without the issuance of a diagnostic
   message), to terminating a translation or execution (with the issuance
   of a diagnostic message).

ANSI classic 3.5.7:

    If an object that has automatic storage duration is not initialized
    explicitly, its value is indeterminate.

So it's illegal, but a diagnostic isn't required.

>gcc compiles it without even a warning, suprisingly. 

Why "suprisingly"?  It doesn't complain about i=i++ either.

Dan
--
Dan Pop
CERN, CN Division
Email: danpop@mail.cern.ch 
Mail:  CERN - PPE, Bat. 31 R-004, CH-1211 Geneve 23, Switzerland