Working example dir for Bazel.

examples/bazel/BUILD

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+
+load("@upb//:upb_proto_library.bzl", "upb_proto_library")
+
+proto_library(
+    name = "foo_proto",
+    srcs = ["foo.proto"],
+)
+
+upb_proto_library(
+    name = "foo_upbproto",
+    deps = [":foo_proto"],
+)
+
+cc_binary(
+    name = "test_binary",
+    srcs = ["test_binary.c"],
+    deps = [":foo_upbproto"],
+)

examples/bazel/WORKSPACE

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+
+workspace(name = "upb_example")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+
+git_repository(
+    name = "upb",
+    remote = "https://github.com/protocolbuffers/upb.git",
+    commit = "d5af87d06bbe3abad66970ce9c7ae0a7de8bb3c6",
+)
+
+load("@upb//:repository_defs.bzl", "bazel_version_repository")
+
+bazel_version_repository(
+    name = "bazel_version",
+)
+
+git_repository(
+    name = "absl",
+    commit = "070f6e47b33a2909d039e620c873204f78809492",
+    remote = "https://github.com/abseil/abseil-cpp.git",
+    shallow_since = "1541627663 -0500",
+)
+
+git_repository(
+    name = "com_google_protobuf",
+    remote = "https://github.com/protocolbuffers/protobuf.git",
+    commit = "d41002663fd04325ead28439dfd5ce2822b0d6fb",
+)
+
+http_archive(
+    name = "bazel_skylib",
+    strip_prefix = "bazel-skylib-master",
+    urls = ["https://github.com/bazelbuild/bazel-skylib/archive/master.tar.gz"],
+)
+
+http_archive(
+    name = "zlib",
+    build_file = "@com_google_protobuf//:third_party/zlib.BUILD",
+    sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
+    strip_prefix = "zlib-1.2.11",
+    urls = ["https://zlib.net/zlib-1.2.11.tar.gz"],
+)

examples/bazel/foo.proto

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+
+syntax = "proto2";
+
+message Foo {
+  optional int64 time = 1;
+  optional string greeting = 2;
+}

examples/bazel/test_binary.c

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+
+#include <time.h>
+
+#include "foo.upb.h"
+
+int main() {
+  upb_arena *arena = upb_arena_new();
+  Foo* foo = Foo_new(arena);
+  const char greeting[] = "Hello, World!\n";
+
+  Foo_set_time(foo, time(NULL));
+  /* Warning: the proto will not copy this, the string data must outlive
+   * the proto. */
+  Foo_set_greeting(foo, upb_strview_makez(greeting));
+
+  upb_arena_free(arena);
+}