Upgrade to Bazel 3.1.0.

This upgrades the Kokoro images, bazel toolchains used by RBE runners, and
rules_go, gazelle, and go toolchain versions.

PiperOrigin-RevId: 312522097

3 files changed, 14 insertions, 14 deletions

diff --git a/WORKSPACE b/WORKSPACE
index e1873e5c0..48f2c57ef 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -26,19 +26,19 @@ http_archive(
     patches = [
         "//tools/nogo:io_bazel_rules_go-visibility.patch",
     ],
-    sha256 = "db2b2d35293f405430f553bc7a865a8749a8ef60c30287e90d2b278c32771afe",
+    sha256 = "87f0fb9747854cb76a0a82430adccb6269f7d394237104a4523b51061c469171",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.22.3/rules_go-v0.22.3.tar.gz",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.22.3/rules_go-v0.22.3.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.23.1/rules_go-v0.23.1.tar.gz",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.23.1/rules_go-v0.23.1.tar.gz",
     ],
 )
 
 http_archive(
     name = "bazel_gazelle",
-    sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10",
+    sha256 = "bfd86b3cbe855d6c16c6fce60d76bd51f5c8dbc9cfcaef7a2bb5c1aafd0710e8",
     urls = [
-        "https://storage.googleapis.com/bazel-mirror/github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.21.0/bazel-gazelle-v0.21.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.21.0/bazel-gazelle-v0.21.0.tar.gz",
     ],
 )
 
@@ -46,7 +46,7 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_depe
 
 go_rules_dependencies()
 
-go_register_toolchains(go_version = "1.14.2")
+go_register_toolchains(go_version = "1.14.3")
 
 load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 
@@ -118,11 +118,11 @@ pip_install()
 # See releases at https://releases.bazel.build/bazel-toolchains.html
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "239a1a673861eabf988e9804f45da3b94da28d1aff05c373b013193c315d9d9e",
-    strip_prefix = "bazel-toolchains-3.0.1",
+    sha256 = "144290c4166bd67e76a54f96cd504ed86416ca3ca82030282760f0823c10be48",
+    strip_prefix = "bazel-toolchains-3.1.1",
     urls = [
-        "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.0.1/bazel-toolchains-3.0.1.tar.gz",
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.0.1/bazel-toolchains-3.0.1.tar.gz",
+        "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.1/bazel-toolchains-3.1.1.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.1/bazel-toolchains-3.1.1.tar.gz",
     ],
 )
 
diff --git a/tools/bazeldefs/BUILD b/tools/bazeldefs/BUILD
index f2f80bae1..335ff6e39 100644
--- a/tools/bazeldefs/BUILD
+++ b/tools/bazeldefs/BUILD
@@ -26,7 +26,7 @@ rbe_platform(
     remote_execution_properties = """
         properties: {
           name: "container-image"
-          value:"docker://gcr.io/cloud-marketplace/google/rbe-ubuntu16-04@sha256:93f7e127196b9b653d39830c50f8b05d49ef6fd8739a9b5b8ab16e1df5399e50"
+          value:"docker://gcr.io/cloud-marketplace/google/rbe-ubuntu16-04@sha256:b516a2d69537cb40a7c6a7d92d0008abb29fba8725243772bdaf2c83f1be2272"
         }
         properties: {
           name: "dockerAddCapabilities"
@@ -46,6 +46,6 @@ rbe_toolchain(
         "manual",
     ],
     target_compatible_with = [],
-    toolchain = "@bazel_toolchains//configs/ubuntu16_04_clang/10.0.0/bazel_2.0.0/cc:cc-compiler-k8",
+    toolchain = "@bazel_toolchains//configs/ubuntu16_04_clang/11.0.0/bazel_3.1.0/cc:cc-compiler-k8",
     toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
 )
diff --git a/tools/vm/ubuntu1604/20_bazel.sh b/tools/vm/ubuntu1604/20_bazel.sh
index bb7afa676..c5d4ced82 100755
--- a/tools/vm/ubuntu1604/20_bazel.sh
+++ b/tools/vm/ubuntu1604/20_bazel.sh
@@ -16,7 +16,7 @@
 
 set -xeo pipefail
 
-declare -r BAZEL_VERSION=2.0.0
+declare -r BAZEL_VERSION=3.1.0
 
 # Install bazel dependencies.
 while true; do