Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version devel +e5f6051e77 Sun Nov 5 19:28:13 2017 +0000 linux/amd64

Does this issue reproduce with the latest release?

Not with the latest stable release 1.9. It reproduces at tip.

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOOS="linux"

What did you do?

$ go build --help
-compiler name
name of compiler to use, as in runtime.Compiler (gccgo or gc).

$ go build -compiler gccgo -a .
buildActionID: unknown build toolchain "gccgo"

What did you expect to see?

I expected the code to compile. It compiles with standard toolchain.

What did you see instead?

Compiler error. gccgo not recognized.