Description
Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?
gccgo trunk/tip
go version devel +7e817859b3 Mon Mar 27 18:51:42 2017 +0000 linux/amd64
What operating system and processor architecture are you using (go env)?
GOARCH="amd64"
GOOS="linux"
What did you do?
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
https://play.golang.org/p/tl4iNxoar6
What did you expect to see?
This program compiles and builds with gccgo, however I note that the compiler is generating more hash/equal functions that it needs to. In particular, it seems to have decided that it should generate hash/equal functions for the anonymous type corresponding to the BySize field in runtime.MemStats, along with a few other runtime types. This is not a bad thing from a correctness point of view, but it results in extra wasted work at compile time and link time, as well as object file bloat.
What did you see instead?
I would expect that the compiler would be able to recognize that the type in question is in an external package and that the hash/equal functions can be picked up externally.