patches/rules_cc_rusty_v8_custom_libcxx.patch

diff --git a/cc/cc_library.bzl b/cc/cc_library.bzl
index c45c5fd954..2e3a01f12a 100644
--- a/cc/cc_library.bzl
+++ b/cc/cc_library.bzl
@@ -15,5 +15,39 @@

 load("@cc_compatibility_proxy//:proxy.bzl", _cc_library = "cc_library")
 
+_RUSTY_V8_CUSTOM_LIBCXX_COPTS = select({
+    "@@//third_party/v8:use_rusty_v8_custom_libcxx": [
+        "-nostdinc++",
+        "-D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
+        "-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE",
+        "-D_LIBCPP_INSTRUMENTED_WITH_ASAN=0",
+        "-D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
+    ],
+    "//conditions:default": [],
+})
+
+_RUSTY_V8_CUSTOM_LIBCXX_DEPS = select({
+    "@@//third_party/v8:use_rusty_v8_custom_libcxx": [
+        "@@//third_party/v8:rusty_v8_custom_libcxx_headers",
+    ],
+    "//conditions:default": [],
+})
+
+_RUSTY_V8_CUSTOM_LIBCXX_REPOS = [
+    # V8 and ICU are patched in-tree. These external C++ dependencies still
+    # build inside the artifact closure once the LLVM toolchain's default
+    # libc++ headers are suppressed.
+    "@abseil-cpp+",
+    "@v8++http_archive+highway",
+    "@v8++http_archive+simdutf",
+]
+
+def _should_use_rusty_v8_custom_libcxx():
+    return native.repository_name() in _RUSTY_V8_CUSTOM_LIBCXX_REPOS
+
 def cc_library(**kwargs):
+    if _should_use_rusty_v8_custom_libcxx():
+        kwargs["copts"] = (kwargs.get("copts", []) or []) + _RUSTY_V8_CUSTOM_LIBCXX_COPTS
+        kwargs["deps"] = (kwargs.get("deps", []) or []) + _RUSTY_V8_CUSTOM_LIBCXX_DEPS
+        kwargs["features"] = (kwargs.get("features", []) or []) + ["-module_maps"]
     _cc_library(**kwargs)