c++/10569: use typedef type as return from main yields warning

[Falk Hueffner]

bangerth@dealii.org writes:

> Old Synopsis: use typedef type as return from main
> New Synopsis: use typedef type as return from main yields warning
> 
> State-Changed-From-To: open->analyzed
> State-Changed-By: bangerth
> State-Changed-When: Wed Apr 30 18:02:19 2003
> State-Changed-Why:
>     Confirmed with present 3.4. The standard says in 3.6.1.2:
>     
>     An implementation shall not predefine the main function.   This  func-
>       tion  shall  not  be  overloaded.  It shall have a return type of type
>       int,...
>     I can't say whether this rules out having a typedef to
>     int instead. I think the answer is: don't do it, there's
>     no good reason for such bogosity.

There's something weird going on, though. For me, it fails with
*error* when turning on -Wall, but not when additionally giving
-pedantic:

falk@juist:/tmp% g++ --version
g++ (GCC) 3.4 20030423 (experimental)
falk@juist:/tmp% g++ -O2 test.cc      
falk@juist:/tmp% g++ -O2 -Wall test.cc
test.cc:2: error: return type for `main' changed to `int'
falk@juist:/tmp% g++ -O2 -Wall -pedantic test.cc
test.cc:2: warning: return type for `main' changed to `int'

Adding -Wall shouldn't make any program fail, I think.

-- 
	Falk