g++ flag?

[Abhisek Sinha]

Hi there,
Earlier compilers used to take the default return type of any function
to be int.
g++, in this case where ther is no return type specified gives error
as
error: ISO C++ forbids declaration of `main' with no type

can this be disabled using any g++ flag in 3.3.3 

It is to be noted that gcc(3.3.2) does not throw any any error even if
there is no return type.
Not even with -ansi and -pedantic flag

Can somebody tell, is gcc not strictly adhering to ISO C++ standard?

Thanks
A