Reland 9756ee7cba

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

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": [],
     }),
 )