Patch for bug 47030

[Thomas Koenig]

Hi Marco,

> I uploaded a patch for 7.3.0, based on previous draft of Tobias,
> plus 3 test cases.

First, thanks for volunteering to fix this!  We welcome any
contribution (there is not danger of running out of bugs to
fix at the moment).

Do you have a copyright assignment to the FSF? We need this to accept
anything but trivial patches. For details, see
https://www.gnu.org/software/gcc/contribute.html .

Finally, for patch submission, there are certain guidelines that
we like to follow. If you read the list, you'll see how it is
done soon enough, but it is also detailed at the link above.

Looking forward to your contributions!

Regards

	Thomas