Example of bazel analysis failure related to kythe's llvm setup

.gitignore

/bazel-*

BUILD

cc_binary(
    name = "this_works",
    srcs = ["main.cc"],
    deps = ["@io_kythe//kythe/cxx/common:kythe_uri"],
)

# This fails bazel analysis because it can't find the compiled llvm libraries,
# which are built outside of bazel. This doesn't actually depend on anything
# llvm-related, but the kythe/cxx/extractor/BUILD file load()s the llvm BUILD
# file. The error looks like:
#
# ERROR: /home/justin/.cache/bazel/_bazel_justin/9739324307232adeb4820707e35a9597/external/io_kythe/third_party/llvm/BUILD:88:1: Traceback (most recent call last):
#     File "/home/justin/.cache/bazel/_bazel_justin/9739324307232adeb4820707e35a9597/external/io_kythe/third_party/llvm/BUILD", line 88
#         cc_resources(name = "clang_builtin_headers_re...", ..."]))
#     File "/home/justin/.cache/bazel/_bazel_justin/9739324307232adeb4820707e35a9597/external/io_kythe/tools/build_rules/cc_resources.bzl", line 11, in cc_resources
#         fail(("Empty `data` attribute in `%s`...))
# Empty `data` attribute in `clang_builtin_headers_resources`
# ERROR: /home/justin/.cache/bazel/_bazel_justin/9739324307232adeb4820707e35a9597/external/io_kythe/third_party/llvm/BUILD:21:1: Target '@io_kythe//third_party/llvm:llvm/build/lib/libclangFormat.a' contains an error and its package is in error and referenced by '@io_kythe//third_party/llvm:llvm'
cc_binary(
    name = "this_doesnt",
    srcs = ["main.cc"],
    deps = ["@io_kythe//kythe/cxx/extractor:lib"],
)

main.cc

#include <iostream>

int main(int argc, char **argv) {
  std::cout << "Hello world" << std::endl;
  return 0;
}

WORKSPACE

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")

git_repository(
    name = "io_kythe",
    commit = "9474b21c8f6685575a5690ad341bb8c965f72589",
    remote = "https://github.com/kythe/kythe",
)

load("@io_kythe//:setup.bzl", "kythe_rule_repositories")

kythe_rule_repositories()

load("@io_kythe//:external.bzl", "kythe_dependencies")

kythe_dependencies()