format-truncation warning with -O2 on gcc 7.1.1

[Jonathan Wakely]

On 22 June 2017 at 15:31, Jonathan Wakely wrote:
> Because the -Wformat-overflow warnings are new in GCC 7, i.e. GCC got
> better. See https://gcc.gnu.org/gcc-7/changes.html#c-family

Oops, I meant -Wformat-truncation not -Wformat-overflow. I copy&pasted
the wrong option.