Similarly to go get, xgo also uses the master branch of a repository during
source code retrieval. To switch to a different branch before compilation pass
the desired branch name through the --branch argument.
xgo --branch release-branch.go1.4 golang.org/x/tools/cmd/goimports
...
ls -al-rwxr-xr-x 1 root root 4139868 Nov 24 16:40 goimports-darwin-10.6-386
-rwxr-xr-x 1 root root 5186720 Nov 24 16:40 goimports-darwin-10.6-amd64
-rwxr-xr-x 1 root root 4189456 Nov 24 16:40 goimports-linux-386
-rwxr-xr-x 1 root root 5264136 Nov 24 16:40 goimports-linux-amd64
-rwxr-xr-x 1 root root 4209416 Nov 24 16:40 goimports-linux-arm
-rwxr-xr-x 1 root root 4348416 Nov 24 16:40 goimports-windows-4.0-386.exe
-rwxr-xr-x 1 root root 5415424 Nov 24 16:40 goimports-windows-4.0-amd64.exe