Hi,

this patch implements an error message, for non-static initialization of a flexible array member.
This duplicates the existing error message from the C-FE, to avoid ICE and wrong code generation
issues, as pointed out in the PR.

It is a bit funny that a non-functional feature like that has already rather much test coverage.
The most easy adjustment seems to change the existing test cases to use static declarations.


Bootstrapped and reg-tested on x86_64-pc-linux-gnu.
Is it OK for trunk?


Thanks
Bernd.