The dev-go/gcp package needs to be split into two packages to resolve dependency cycles.

The CL for the split package: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/915127

However, I can't get the dev-go/grpc-credentials-oauth package to build.

The build seems to be looking for google.golang.org/grpc/credentials

google.golang.org/grpc/credentials is packaged in dev-go/grpc, but including dev-go/grpc in DEPEND and RDEPEND does not fix the issue.

(cr) ((8e3381b...)) ayatane@sharanohiar ~/trunk/src/scripts $ sudo emerge dev-go/grpc-credentials-oauth
Calculating dependencies... done!

>>> Emerging (1 of 1) dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos
 * Running stacked hooks for pre_pkg_setup
 *    sysroot_build_bin_dir ...                                                                                                                                                                                                                                                                                        [ ok ]
 * Running stacked hooks for post_pkg_setup
 *    python_eclass_hack ...                                                                                                                                                                                                                                                                                           [ ok ]
 * Running stacked hooks for pre_src_unpack
 *    python_multilib_setup ...                                                                                                                                                                                                                                                                                        [ ok ]
>>> Unpacking source...
GIT update -->
   repository:               https://chromium.googlesource.com/external/github.com/grpc/grpc-go.git
   at the commit:            d50734d1d6ca477a72646f3022216ec39639f4cd
   commit:                   v1.6.0
   branch:                   master
   storage directory:        "/var/cache/chromeos-cache/distfiles/host/egit-src/external/github.com/grpc/grpc-go"
   checkout type:            bare repository
Cloning into '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0/src/google.golang.org/grpc'...
done.
Switched to a new branch 'tree-v1.6.0'
>>> Unpacked to /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0/src/google.golang.org/grpc
>>> Source unpacked in /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work
 * Running stacked hooks for post_src_unpack
 *    asan_init ...                                                                                                                                                                                                                                                                                                    [ ok ]
>>> Preparing source in /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0 ...
>>> Source compiled.
>>> Test phase [not enabled]: dev-go/grpc-credentials-oauth-1.6.0-r1

>>> Install grpc-credentials-oauth-1.6.0-r1 into /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/image/ category dev-go
 * Installing "google.golang.org/grpc/credentials/oauth"
[../../image/usr/lib/gopath/src/google.golang.org/grpc/credentials/oauth/oauth.go:31:2: no Go files in /var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/image/usr/lib/gopath/src/google.golang.org/grpc/credentials]
 * ERROR: dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos failed (install phase):
 *   Package has missing dependency: "google.golang.org/grpc/credentials/oauth"
 * 
 * Call stack:
 *     ebuild.sh, line  133:  Called src_install
 *   environment, line 3493:  Called cros-go_src_install
 *   environment, line  757:  Called die
 * The specific snippet of code:
 *               die "Package has missing dependency: \"${pkg}\"";
 * 
 * If you need support, post the output of `emerge --info '=dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos'`,
 * the complete build log and the output of `emerge -pqv '=dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos'`.
 * The complete build log is located at '/var/log/portage/dev-go:grpc-credentials-oauth-1.6.0-r1:20180213-001945.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0'
 * S: '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0'

>>> Failed to emerge dev-go/grpc-credentials-oauth-1.6.0-r1, Log file:

>>>  '/var/log/portage/dev-go:grpc-credentials-oauth-1.6.0-r1:20180213-001945.log'

 * Messages for package dev-go/grpc-credentials-oauth-1.6.0-r1:

 * ERROR: dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos failed (install phase):
 *   Package has missing dependency: "google.golang.org/grpc/credentials/oauth"
 * 
 * Call stack:
 *     ebuild.sh, line  133:  Called src_install
 *   environment, line 3493:  Called cros-go_src_install
 *   environment, line  757:  Called die
 * The specific snippet of code:
 *               die "Package has missing dependency: \"${pkg}\"";
 * 
 * If you need support, post the output of `emerge --info '=dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos'`,
 * the complete build log and the output of `emerge -pqv '=dev-go/grpc-credentials-oauth-1.6.0-r1::chromiumos'`.
 * The complete build log is located at '/var/log/portage/dev-go:grpc-credentials-oauth-1.6.0-r1:20180213-001945.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0'
 * S: '/var/tmp/portage/dev-go/grpc-credentials-oauth-1.6.0-r1/work/grpc-credentials-oauth-1.6.0'
(cr) ((8e3381b...)) ayatane@sharanohiar ~/trunk/src/scripts $