diff --git a/cc/toolchains/impl/toolchain_config.bzl b/cc/toolchains/impl/toolchain_config.bzl
index 4300c1db8..69e0b6720 100644
--- a/cc/toolchains/impl/toolchain_config.bzl
+++ b/cc/toolchains/impl/toolchain_config.bzl
@@ -95,9 +95,9 @@ def cc_toolchain_config_impl_helper(ctx):
             # compiler
             compiler = ctx.attr.compiler,
             target_cpu = ctx.attr.cpu,
+            target_libc = ctx.attr.target_libc,  # Used by legacy features to determine if we're building for Apple platfroms or not
             target_system_name = ctx.expand_make_variables("target_system_name", ctx.attr.target_system_name, {}),
             # These fields are only relevant for legacy toolchain resolution.
-            target_libc = "",
             abi_version = "",
             abi_libc_version = "",
         ),
@@ -120,6 +120,7 @@ CC_TOOLCHAIN_CONFIG_PUBLIC_ATTRS = {
     # Attributes new to this rule.
     "compiler": attr.string(default = ""),
     "cpu": attr.string(default = ""),
+    "target_libc": attr.string(default = ""),
     "target_system_name": attr.string(default = ""),
     "tool_map": attr.label(providers = [ToolConfigInfo], mandatory = True),
     "args": attr.label_list(providers = [ArgsListInfo]),
diff --git a/cc/toolchains/toolchain.bzl b/cc/toolchains/toolchain.bzl
index 3890b3e80..6637d4481 100644
--- a/cc/toolchains/toolchain.bzl
+++ b/cc/toolchains/toolchain.bzl
@@ -172,6 +172,11 @@ def cc_toolchain(
         "//conditions:default": "",
     })
 
+    target_libc = select({
+        Label("//cc/settings:apple_constraint"): "macosx",
+        "//conditions:default": "",
+    })
+
     if bazel_features.cc.supports_starlarkified_toolchains:
         _cc_toolchain(
             name = name,
@@ -183,6 +188,7 @@ def cc_toolchain(
             known_features = known_features,
             enabled_features = enabled_features,
             compiler = compiler,
+            target_libc = target_libc,
             cpu = cpu or _CPU,
             target_system_name = target_system_name,
             dynamic_runtime_lib = dynamic_runtime_lib,
@@ -208,6 +214,7 @@ def cc_toolchain(
         enabled_features = enabled_features,
         compiler = compiler,
         cpu = cpu or _CPU,
+        target_libc = target_libc,
         target_system_name = target_system_name,
         visibility = ["//visibility:private"],
         **kwargs