[bazel] Update example workspace files with dependencies

[aidengrossman]

Summary

Currently, the example workspace files do not work properly. The llvm_disable_optional_support_deps option was removed in 7b5d6cd and zlib and zstd have been needed-by-default dependencies for a while, so it would make sense to show definitions in the example bazel workspace files, especially given the version sensitivity of the zlib-ng build. This patch removes the use of dated build config flags and adds dependency definitions to both of the example workspaces.

[aaronmondal]

Thanks a lot for this! This is something I should've done after the zlib changes but I completely forgot about it 😰

If the LLVM commit in these examples is recent enough for this change I'm fine with it. If not, it would probably be good to bump that to a more recent commit so that a naive copy-paste of these examples works.

Otherwise LGTM :)

utils/bazel/examples/http_archive/WORKSPACE

http_archive(
     sha256 = "97e70364e9249702246c0e9444bccdc4b847bed1eb03c5a3ece4f83dfe6abc44",
     urls = [
         "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/{version}/bazel-skylib-{version}.tar.gz".format(version=SKYLIB_VERSION),
         "https://github.com/bazelbuild/bazel-skylib/releases/download/{version}/bazel-skylib-{version}.tar.gz".format(version=SKYLIB_VERSION),
     ],
 )
 
 # Replace with the LLVM commit you want to use.
-LLVM_COMMIT = "81d5412439efd0860c0a8dd51b831204f118d485"
+LLVM_COMMIT = "926f85db98aae66ab8f57b9981f47ddddb868c51"
 
 # The easiest way to calculate this for a new commit is to set it to empty and
 # then run a bazel build and it will report the digest necessary to cache the
 # archive and make the build reproducible.
-LLVM_SHA256 = "50b3ef31b228ea0c96ae074005bfac087c56e6a4b1c147592dd33f41cad0706b"
+LLVM_SHA256 = "c78c94b2a03b2cf6ef1ba035c31a6f1b0bb7913da8af5aa8d5c2061f6499d589"
 
 http_archive(
     name = "llvm-raw",
     build_file_content = "# empty",
     sha256 = LLVM_SHA256,
     strip_prefix = "llvm-project-" + LLVM_COMMIT,
     urls = ["https://github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT)],
 )
 
-load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure", "llvm_disable_optional_support_deps")
+load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure")
 
 llvm_configure(name = "llvm-project")
+
+maybe(
+    http_archive,
+    name = "llvm_zlib",
+    build_file = "@llvm-raw//utils/bazel/third_party_build:zlib-ng.BUILD",
+    sha256 = "e36bb346c00472a1f9ff2a0a4643e590a254be6379da7cddd9daeb9a7f296731",
+    strip_prefix = "zlib-ng-2.0.7",
+    urls = [
+        "https://github.com/zlib-ng/zlib-ng/archive/refs/tags/2.0.7.zip",
+    ],
+)
+
+maybe(
+    http_archive,
+    name = "llvm_zstd",
+    build_file = "@llvm-raw//utils/bazel/third_party_build:zstd.BUILD",
+    sha256 = "7c42d56fac126929a6a85dbc73ff1db2411d04f104fae9bdea51305663a83fd0",
+    strip_prefix = "zstd-1.5.2",
+    urls = [
+        "https://github.com/facebook/zstd/releases/download/v1.5.2/zstd-1.5.2.tar.gz"
+    ],
+)

utils/bazel/examples/submodule/WORKSPACE

 
 new_local_repository(
     name = "llvm-raw",
     build_file_content = "# empty",
     # Or wherever your submodule is located.
     path = "third_party/llvm-project",
 )
 
-load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure", "llvm_disable_optional_support_deps")
+load("@llvm-raw//utils/bazel:configure.bzl", "llvm_configure")
 
 llvm_configure(name = "llvm-project")
+
+maybe(
+    http_archive,
+    name = "llvm_zlib",
+    build_file = "@llvm-raw//utils/bazel/third_party_build:zlib-ng.BUILD",
+    sha256 = "e36bb346c00472a1f9ff2a0a4643e590a254be6379da7cddd9daeb9a7f296731",
+    strip_prefix = "zlib-ng-2.0.7",
+    urls = [
+        "https://github.com/zlib-ng/zlib-ng/archive/refs/tags/2.0.7.zip",
+    ],
+)
+
+maybe(
+    http_archive,
+    name = "llvm_zstd",
+    build_file = "@llvm-raw//utils/bazel/third_party_build:zstd.BUILD",
+    sha256 = "7c42d56fac126929a6a85dbc73ff1db2411d04f104fae9bdea51305663a83fd0",
+    strip_prefix = "zstd-1.5.2",
+    urls = [
+        "https://github.com/facebook/zstd/releases/download/v1.5.2/zstd-1.5.2.tar.gz"
+    ],
+)