why does this compile? cygwin GCC 3.4.4

[eduzea]

int main()
{
int variable;
int array[variable];
}

As I understand it, array should be compiler allocated, so it cannot
have a variable as size.

Thanks,

Eduardo

 

[Victor Bazarov]

int main()
{
int variable;
int array[variable];
}

As I understand it, array should be compiler allocated, so it cannot
have a variable as size.

It's a C++ "extension" g++ provides. Learn the compiler options that
don't allow extensions.

V

 

[Default User]

int main()
{
int variable;
int array[variable];
}

As I understand it, array should be compiler allocated, so it cannot
have a variable as size.

That's a gcc extension. Use the correct compiler flags to force it to
standard mode.




Brian

 

[James Kanze]

int main()
{
int variable;
int array[variable];
}

As I understand it, array should be compiler allocated, so it
cannot have a variable as size.

You understand correctly. For C++, anyway; in C, it's legal.
Some compilers allow it by default in C++ as well; you should
generally make sure you use the options necessary to turn off
all extensions except those you explicitly want. (About the
only extension I normally use is Posix support.)