Move implementation detail settings into private module

rust/defs.bzl

@@ -48,8 +48,6 @@ load(
     _extra_exec_rustc_flags = "extra_exec_rustc_flags",
     _extra_rustc_flag = "extra_rustc_flag",
     _extra_rustc_flags = "extra_rustc_flags",
-    _is_proc_macro_dep = "is_proc_macro_dep",
-    _is_proc_macro_dep_enabled = "is_proc_macro_dep_enabled",
     _no_std = "no_std",
     _per_crate_rustc_flag = "per_crate_rustc_flag",
 )
@@ -124,12 +122,6 @@ extra_exec_rustc_flag = _extra_exec_rustc_flag
 extra_exec_rustc_flags = _extra_exec_rustc_flags
 # See @rules_rust//rust/private:rustc.bzl for a complete description.
 
-is_proc_macro_dep = _is_proc_macro_dep
-# See @rules_rust//rust/private:rustc.bzl for a complete description.
-
-is_proc_macro_dep_enabled = _is_proc_macro_dep_enabled
-# See @rules_rust//rust/private:rustc.bzl for a complete description.
-
 per_crate_rustc_flag = _per_crate_rustc_flag
 # See @rules_rust//rust/private:rustc.bzl for a complete description.
 

rust/private/BUILD.bazel

@@ -1,5 +1,6 @@
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("//rust/private:rust_analyzer.bzl", "rust_analyzer_detect_sysroot")
+load("//rust/private:rustc.bzl", "is_proc_macro_dep", "is_proc_macro_dep_enabled")
 load("//rust/private:stamp.bzl", "stamp_build_setting")
 
 bzl_library(
@@ -11,6 +12,24 @@ bzl_library(
 
 stamp_build_setting(name = "stamp")
 
+# This setting may be used to identify dependencies of proc-macro-s.
+# This feature is only enabled if `is_proc_macro_dep_enabled` is true.
+# Its value controls the BAZEL_RULES_RUST_IS_PROC_MACRO_DEP environment variable
+# made available to the rustc invocation.
+is_proc_macro_dep(
+    name = "is_proc_macro_dep",
+    build_setting_default = False,
+    visibility = ["//visibility:public"],
+)
+
+# This setting enables the feature to identify dependencies of proc-macro-s,
+# see `is_proc_macro_dep`.
+is_proc_macro_dep_enabled(
+    name = "is_proc_macro_dep_enabled",
+    build_setting_default = False,
+    visibility = ["//visibility:public"],
+)
+
 rust_analyzer_detect_sysroot(
     name = "rust_analyzer_detect_sysroot",
     visibility = ["//visibility:public"],

rust/private/rust.bzl

@@ -626,10 +626,10 @@ _common_attrs = {
         cfg = "exec",
     ),
     "_is_proc_macro_dep": attr.label(
-        default = Label("//:is_proc_macro_dep"),
+        default = Label("//rust/private:is_proc_macro_dep"),
     ),
     "_is_proc_macro_dep_enabled": attr.label(
-        default = Label("//:is_proc_macro_dep_enabled"),
+        default = Label("//rust/private:is_proc_macro_dep_enabled"),
     ),
     "_per_crate_rustc_flag": attr.label(
         default = Label("//:experimental_per_crate_rustc_flag"),
@@ -876,14 +876,14 @@ rust_shared_library = rule(
 )
 
 def _proc_macro_dep_transition_impl(settings, _attr):
-    if settings["//:is_proc_macro_dep_enabled"]:
-        return {"//:is_proc_macro_dep": True}
+    if settings["//rust/private:is_proc_macro_dep_enabled"]:
+        return {"//rust/private:is_proc_macro_dep": True}
     else:
         return []
 
 _proc_macro_dep_transition = transition(
-    inputs = ["//:is_proc_macro_dep_enabled"],
-    outputs = ["//:is_proc_macro_dep"],
+    inputs = ["//rust/private:is_proc_macro_dep_enabled"],
+    outputs = ["//rust/private:is_proc_macro_dep"],
     implementation = _proc_macro_dep_transition_impl,
 )