PR80806

[Jakub Jelinek]

On Fri, Jun 30, 2017 at 10:25:51AM +0200, Richard Biener wrote:
> Do not go down the route of -Wunreachable-code again please.

Yeah, I don't think we want -Wunused-but-set* as a late warning,
it is intentionally in the FE where is the only place where the false
positive ratio of the warning can stay under control, and even then many
projects like the Linux kernel turn the warning off.

If we want to special case memset/memcpy dest arg for DECL_READ_P, let's do
it, but in the FE only.

	Jakub