Would it be possible to change the D declaration
"void main() {}" to return 0 back to the shell ?

Currently it seems to return "1", or failure*...
(as per C macros: EXIT_SUCCESS=0, EXIT_FAILURE=1)


Which makes that you must use the somewhat longer
"int main() { return 0; }", just to make it happy.

(if you actually wanted to read arguments and return
a code, you'd probably use: "int main(char[] args)")


Allowing "void main()" would be a nice improvement
over ANSI C, which has the same main restrictions.

That is: if you declare main as void, the compiler
should explicitly insert a "return 0;" equivalent.

--anders

* For some reason, DMD on Linux returns a "12" ???

  Seems like all bets are off now, you can even declare
  stuff like "float main()" (for fuzzy return states?)

  GCC does at least whine, in the same situation:
  "warning: return type of `main' is not `int'"

In article <cof1cb$p8$1@digitaldaemon.com>, Anders says;
>
>
>Would it be possible to change the D declaration
>"void main() {}" to return 0 back to the shell ?
>
>Currently it seems to return "1", or failure*...
>(as per C macros: EXIT_SUCCESS=0, EXIT_FAILURE=1)
>
>
>Which makes that you must use the somewhat longer
>"int main() { return 0; }", just to make it happy.
>
>(if you actually wanted to read arguments and return
>a code, you'd probably use: "int main(char[] args)")
>
>
>Allowing "void main()" would be a nice improvement
>over ANSI C, which has the same main restrictions.
>
>That is: if you declare main as void, the compiler
>should explicitly insert a "return 0;" equivalent.
>
>--anders
>
>* For some reason, DMD on Linux returns a "12" ???
>
>   Seems like all bets are off now, you can even declare
>   stuff like "float main()" (for fuzzy return states?)
>
>   GCC does at least whine, in the same situation:
>   "warning: return type of `main' is not `int'"

If you play a little around, you'll notice that the "return" value is pseudo random. I guess that whatever value is stored in EAX will be "returned" to the shell.

Thomas

Thomas wrote:

>>* For some reason, DMD on Linux returns a "12" ???
> 
> If you play a little around, you'll notice that the "return" value is pseudo
> random. I guess that whatever value is stored in EAX will be "returned" to the
> shell.

You are correct. (with DMD compiler)

> $ cat returncode.d
> void main() { asm { mov EAX, 42; } }
returns
> $ ./returncode; echo $?
> 42

Still returns 1 with gdc, though...


I think it should either be an error, or return 0 always ?

--anders