x/crypto/poly1305: Sum declared in both sum_ref.go:37 and sum_arm.go for Go 1.6

[chadmiller]

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

1.6.2-0ubuntu5~16.04

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

Ubuntu 16.04, armhf

What did you do?

Tried to build/install https://github.com/Yawning/obfs4 on an ARMHF machine.

go install ./obfs4.git/...
# golang.org/x/crypto/poly1305
golang.org/x/crypto/poly1305/sum_ref.go:37: Sum redeclared in this block
    previous declaration at golang.org/x/crypto/poly1305/sum_arm.go:16
Command '['/bin/sh', '/tmp/tmpy80swmr2', 'go', 'install', './obfs4.git/...']' returned non-zero exit status 2

Happens only for 32-bit arm. Not arm64, amd64, i386.

[bradfitz]

@agl, this only affects Go 1.6. The +build constraints aren't quite right.

I'm tagging this Go1.8 because it needs to be done soon (red builders aren't useful to anybody), but it's not actually part of the release.

[gopherbot]

CL https://golang.org/cl/31492 mentions this issue.