Use abs from utils instead of the global (#3075)

Fixes #3068

cargo/private/cargo_utils.bzl

@@ -2,6 +2,20 @@
 
 load("//rust/platform:triple_mappings.bzl", "system_to_binary_ext")
 
+# TODO: remove after dropping support for Bazel < 7 when `abs` is a global
+def abs(value):
+    """Returns the absolute value of a number.
+
+    Args:
+      value (int): A number.
+
+    Returns:
+      int: The absolute value of the number.
+    """
+    if value < 0:
+        return -value
+    return value
+
 def _resolve_repository_template(
         *,
         template,

rust/private/compat.bzl

@@ -0,0 +1,29 @@
+# Copyright 2015 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Compatibility functions for older Bazel versions."""
+
+# TODO: remove after dropping support for Bazel < 7 when `abs` is a global
+def abs(value):
+    """Returns the absolute value of a number.
+
+    Args:
+      value (int): A number.
+
+    Returns:
+      int: The absolute value of the number.
+    """
+    if value < 0:
+        return -value
+    return value

rust/private/rustc.bzl

@@ -23,22 +23,22 @@ load(
     "CPP_LINK_STATIC_LIBRARY_ACTION_NAME",
 )
 load("//rust/private:common.bzl", "rust_common")
+load("//rust/private:compat.bzl", "abs")
 load("//rust/private:providers.bzl", "RustcOutputDiagnosticsInfo", _BuildInfo = "BuildInfo")
 load("//rust/private:stamp.bzl", "is_stamping_enabled")
 load(
     "//rust/private:utils.bzl",
-    "abs",
     "expand_dict_value_locations",
     "expand_list_element_locations",
     "find_cc_toolchain",
     "get_lib_name_default",
     "get_lib_name_for_windows",
     "get_preferred_artifact",
     "is_exec_configuration",
+    "is_std_dylib",
     "make_static_lib_symlink",
     "relativize",
 )
-load(":utils.bzl", "is_std_dylib")
 
 # This feature is disabled unless one of the dependencies is a cc_library.
 # Authors of C++ toolchains can place linker flags that should only be applied

rust/private/utils.bzl

@@ -16,6 +16,7 @@
 
 load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@bazel_tools//tools/cpp:toolchain_utils.bzl", find_rules_cc_toolchain = "find_cpp_toolchain")
+load(":compat.bzl", "abs")
 load(":providers.bzl", "BuildInfo", "CrateGroupInfo", "CrateInfo", "DepInfo", "DepVariantInfo", "RustcOutputDiagnosticsInfo")
 
 UNSUPPORTED_FEATURES = [
@@ -175,19 +176,6 @@ def get_lib_name_for_windows(lib):
 
     return libname
 
-def abs(value):
-    """Returns the absolute value of a number.
-
-    Args:
-      value (int): A number.
-
-    Returns:
-      int: The absolute value of the number.
-    """
-    if value < 0:
-        return -value
-    return value
-
 def determine_output_hash(crate_root, label):
     """Generates a hash of the crate root file's path.
 

rust/repositories.bzl

@@ -5,6 +5,7 @@ load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
 load("//rust/platform:triple.bzl", "get_host_triple", "triple")
 load("//rust/platform:triple_mappings.bzl", "triple_to_constraint_set")
 load("//rust/private:common.bzl", "rust_common")
+load("//rust/private:compat.bzl", "abs")
 load(
     "//rust/private:repository_utils.bzl",
     "BUILD_for_rust_analyzer_proc_macro_srv",