Reland 9756ee7

Since Fuchsia engineers rarely work within this repo, initialize a lightweight fake @fuchsia_sdk repo rather than distributing the Fuchsia SDK here.

Tested locally via `bazel query --[no]enable_bzlmod "deps(set(//googletest/test:gtest_all_test))"` (#4472)

PiperOrigin-RevId: 610826859
Change-Id: I7d41b1dbe9e7f133fe535d7337dc5bff5bf97d3a

Author: Abseil Team

BUILD.bazel

@@ -56,6 +56,12 @@ config_setting(
     constraint_values = ["@platforms//os:openbsd"],
 )
 
+# NOTE: Fuchsia is not an officially supported platform.
+config_setting(
+    name = "fuchsia",
+    constraint_values = ["@platforms//os:fuchsia"],
+)
+
 config_setting(
     name = "msvc_compiler",
     flag_values = {
@@ -147,6 +153,17 @@ cc_library(
             "@com_googlesource_code_re2//:re2",
         ],
         "//conditions:default": [],
+    }) + select({
+        # `gtest-death-test.cc` has `EXPECT_DEATH` that spawns a process,
+        # expects it to crash and inspects its logs with the given matcher,
+        # so that's why these libraries are needed.
+        # Otherwise, builds targeting Fuchsia would fail to compile.
+        ":fuchsia": [
+            "@fuchsia_sdk//pkg/fdio",
+            "@fuchsia_sdk//pkg/syslog",
+            "@fuchsia_sdk//pkg/zx",
+        ],
+        "//conditions:default": [],
     }),
 )
 

MODULE.bazel

@@ -53,5 +53,9 @@ bazel_dep(name = "re2",
 bazel_dep(name = "rules_python",
           version = "0.29.0")
 
+
+fake_fuchsia_sdk = use_repo_rule("//:fake_fuchsia_sdk.bzl", "fake_fuchsia_sdk")
+fake_fuchsia_sdk(name = "fuchsia_sdk")
+
 # https://github.com/bazelbuild/rules_python/blob/main/BZLMOD_SUPPORT.md#default-toolchain-is-not-the-local-system-python
 register_toolchains("@bazel_tools//tools/python:autodetecting_toolchain")

fake_fuchsia_sdk.bzl

@@ -0,0 +1,33 @@
+"""Provides a fake @fuchsia_sdk implementation that's used when the real one isn't available.
+
+This is needed since bazel queries on targets that depend on //:gtest (eg:
+`bazel query "deps(set(//googletest/test:gtest_all_test))"`) will fail if @fuchsia_sdk is not
+defined when bazel is evaluating the transitive closure of the query target.
+
+See https://github.com/google/googletest/issues/4472.
+"""
+
+def _fake_fuchsia_sdk_impl(repo_ctx):
+    for stub_target in repo_ctx.attr._stub_build_targets:
+        stub_package = stub_target
+        stub_target_name = stub_target.split("/")[-1]
+        repo_ctx.file("%s/BUILD.bazel" % stub_package, """
+filegroup(
+    name = "%s",
+)
+""" % stub_target_name)
+
+fake_fuchsia_sdk = repository_rule(
+    doc = "Used to create a fake @fuchsia_sdk repository with stub build targets.",
+    implementation = _fake_fuchsia_sdk_impl,
+    attrs = {
+        "_stub_build_targets": attr.string_list(
+            doc = "The stub build targets to initialize.",
+            default = [
+                "pkg/fdio",
+                "pkg/syslog",
+                "pkg/zx",
+            ],
+        ),
+    },
+)

googletest_deps.bzl

@@ -1,6 +1,7 @@
 """Load dependencies needed to use the googletest library as a 3rd-party consumer."""
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+load("//:fake_fuchsia_sdk.bzl", "fake_fuchsia_sdk")
 
 def googletest_deps():
     """Loads common dependencies needed to use the googletest library."""
@@ -20,3 +21,8 @@ def googletest_deps():
             strip_prefix = "abseil-cpp-20240116.0",
             urls = ["https://github.com/abseil/abseil-cpp/releases/download/20240116.0/abseil-cpp-20240116.0.tar.gz"],
         )
+
+    if not native.existing_rule("fuchsia_sdk"):
+        fake_fuchsia_sdk(
+            name = "fuchsia_sdk",
+        )