The Oracle blog has a
lengthy article on enhancements to GCC to help detect overflows of
flexible array members (FAMs) in C programs.

We describe here two new GNU extensions which specify size
information for FAMs. These are a new attribute,
"counted_by" and a new builtin function,
"__builtin_counted_by_ref". Both extensions can be used in
GNU C applications to specify size information for FAMs, improving
the buffer overflow detection for FAMs in general.

This work has been covered on LWN as well.

https://lwn.net/Articles/1047547/
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