After v1.49, you need to enforce c++14 on the project.
Create .bazelrc file with content: build --cxxopt='-std=c++14'

Example for v1.51.1 (on WORKSPACE):

# v1.51.1 0a82c02a9b817a53574994374dcff53f2e961df2
http_archive(
    name = "com_github_grpc_grpc",
    urls = [
        "https://github.com/grpc/grpc/archive/0a82c02a9b817a53574994374dcff53f2e961df2.tar.gz",
    ],
    strip_prefix = "grpc-0a82c02a9b817a53574994374dcff53f2e961df2",
)
load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
grpc_deps()
load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
grpc_extra_deps()

Possibly caused by bazelbuild/bazel#12887

Hi, extremely thankful for providing this easy bazel gRPC template. I am running into an issue when using the bazel build command on my windows PC. I was wondering if you could provide some guidance. Here's the output of running "bazel build :greeter_server",

ERROR: D:/work/git/tutorials/grpc/grpc_getting_started/BUILD:35:16: Action helloworld.grpc.pb.h failed (Exit -1073741515): protoc.exe failed: error executing command
cd C:/users/bj3pgh/_bazel_bj3pgh/4ot2dzx3/execroot/main
bazel-out/host/bin/external/com_google_protobuf/protoc.exe --plugin=protoc-gen-PLUGIN=bazel-out/host/bin/external/com_github_grpc_grpc/src/compiler/grpc_cpp_plugin.exe --PLUGIN_out=bazel-out/x64_windows-fastbuild/bin --proto_path=. --proto_path=bazel-out/x64_windows-fastbuild/bin helloworld.proto
Execution platform: @local_config_platform//:host
Target //:greeter_client failed to build
ERROR: D:/work/git/tutorials/grpc/grpc_getting_started/BUILD:35:16 Action helloworld.grpc.pb.h failed (Exit -1073741515): protoc.exe failed: error executing command
cd C:/users/bj3pgh/_bazel_bj3pgh/4ot2dzx3/execroot/main
bazel-out/host/bin/external/com_google_protobuf/protoc.exe --plugin=protoc-gen-PLUGIN=bazel-out/host/bin/external/com_github_grpc_grpc/src/compiler/grpc_cpp_plugin.exe --PLUGIN_out=bazel-out/x64_windows-fastbuild/bin --proto_path=. --proto_path=bazel-out/x64_windows-fastbuild/bin helloworld.proto
Execution platform: @local_config_platform//:host
INFO: Elapsed time: 1.575s, Critical Path: 0.44s
INFO: 14 processes: 14 internal.
FAILED: Build did NOT complete successfully