Warnings for unhandled c++ exceptions?

["Wesley W. Terpstra" <terpstra at ito dot tu-darmstadt dot de>]

Is there a compiler flag for g++ which would warn on these code snippets:

1.

void foo()
{
	throw 4;
}

Warning: Exception 'int' must be caught, or it must be declared in throw ()
clause of this method.

2.

void foo() throw (int)
{
	throw 4;
}

void bar()
{
	foo();
}

Warning: ... bar ... 'int' must be caught or ...

----------------------------

I find this feature of Java remarkably useful as it helps to detect sloppy
exception handling, which is brutal to find in C++. I do not desire to
change the C++ language much; I like it just how it is, but I think an
optional warning would be useful during development under g++.

Since g++ can also invoke Java methods, and in turn be called by them, it
also makes sense that g++ should be able to maintain the Java-style
guarantees about only throwing what one declares throwable.

Is there some undocumented -W option to turn this warning on?
Is there some patch someone has I can apply to add this feature?
And if not ... shouldn't there be?

----------------------------

Relatedly, I'm sure you are aware of this odd behaviour:
	(debian gcc 3.2.2-0pre5)

int foo() throw (int)
{
	throw "this will abort -- why? I broke my promise, but no warning...";
}

int main()
{
	try
	{
		foo();
	}
	catch (const char* s)
	{
		// should catch here...
	}
	catch (int x)
	{
		// in case of a weird conversion
	}
	return 0;
}

----------------------------

Thanks for your time.

---
Wes