Build fix. (#378)

Need rules_cc for abseil and build_bazel_rules_apple for grpc.

Author: g-easy

WORKSPACE

@@ -16,6 +16,13 @@ workspace(name = "io_opencensus_cpp")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
+# Build rules for C++ projects.
+http_archive(
+    name = "rules_cc",
+    strip_prefix = "rules_cc-master",
+    urls = ["https://github.com/bazelbuild/rules_cc/archive/master.zip"],
+)
+
 # We depend on Abseil.
 http_archive(
     name = "com_google_absl",
@@ -39,6 +46,20 @@ http_archive(
     urls = ["https://github.com/google/benchmark/archive/master.zip"],
 )
 
+# Used by gRPC.
+http_archive(
+    name = "build_bazel_rules_apple",
+    strip_prefix = "rules_apple-master",
+    urls = ["https://github.com/bazelbuild/rules_apple/archive/master.zip"],
+)
+
+load(
+    "@build_bazel_rules_apple//apple:repositories.bzl",
+    "apple_rules_dependencies",
+)
+
+apple_rules_dependencies()
+
 # Used by gRPC.
 http_archive(
     name = "build_bazel_apple_support",

tools/pin_deps.py

@@ -51,10 +51,12 @@ def workspace_rule(self):
 
 # grep -A1 http_archive\( WORKSPACE
 PROJECTS = [
+    GitHubProject('rules_cc', 'bazelbuild', 'rules_cc'),
     GitHubProject('com_google_absl', 'abseil', 'abseil-cpp'),
     GitHubProject('com_google_googletest', 'google', 'googletest'),
     GitHubProject('com_github_google_benchmark', 'google', 'benchmark'),
     GitHubProject('build_bazel_apple_support', 'bazelbuild', 'apple_support'),
+    GitHubProject('build_bazel_rules_apple', 'bazelbuild', 'rules_apple'),
     GitHubProject('com_github_grpc_grpc', 'grpc', 'grpc'),
     GitHubProject('com_github_jupp0r_prometheus_cpp', 'jupp0r', 'prometheus-cpp'),
     GitHubProject('com_github_curl', 'curl', 'curl'),