libbinder_rs: Build libbinder_ndk_sys on Trusty

Adds a rules.mk build file to build the C wrapper
crate on Trusty with bindgen.

Bug: 242243245
Test: build binder_ndk_sys as a dependency of skel_rust
Change-Id: I54af010a49763bda785230261d56485ffd15e98f

2 files changed, 52 insertions, 1 deletions

diff --git a/libs/binder/rust/sys/lib.rs b/libs/binder/rust/sys/lib.rs
index 1d1a295221..c5c847b874 100644
--- a/libs/binder/rust/sys/lib.rs
+++ b/libs/binder/rust/sys/lib.rs
@@ -19,7 +19,20 @@
 use std::error::Error;
 use std::fmt;
 
-include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+#[cfg(not(target_os = "trusty"))]
+mod bindings {
+    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+}
+
+// Trusty puts the full path to the auto-generated file in BINDGEN_INC_FILE
+// and builds it with warnings-as-errors, so we need to use #[allow(bad_style)]
+#[cfg(target_os = "trusty")]
+#[allow(bad_style)]
+mod bindings {
+    include!(env!("BINDGEN_INC_FILE"));
+}
+
+pub use bindings::*;
 
 impl Error for android_c_interface_StatusCode {}
 
diff --git a/libs/binder/trusty/rust/binder_ndk_sys/rules.mk b/libs/binder/trusty/rust/binder_ndk_sys/rules.mk
new file mode 100644
index 0000000000..672d9b75ec
--- /dev/null
+++ b/libs/binder/trusty/rust/binder_ndk_sys/rules.mk
@@ -0,0 +1,38 @@
+# Copyright (C) 2023 The Android Open Source Project
+#
+# 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.
+#
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+LIBBINDER_DIR := $(LOCAL_DIR)/../../..
+LIBBINDER_NDK_BINDGEN_FLAG_FILE := \
+	$(LIBBINDER_DIR)/rust/libbinder_ndk_bindgen_flags.txt
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS := $(LIBBINDER_DIR)/rust/sys/lib.rs
+
+MODULE_CRATE_NAME := binder_ndk_sys
+
+MODULE_LIBRARY_DEPS += \
+	$(LIBBINDER_DIR)/trusty \
+	$(LIBBINDER_DIR)/trusty/ndk \
+	trusty/user/base/lib/trusty-sys \
+
+MODULE_BINDGEN_SRC_HEADER := $(LIBBINDER_DIR)/rust/sys/BinderBindings.hpp
+
+# Add the flags from the flag file
+MODULE_BINDGEN_FLAGS += $(shell cat $(LIBBINDER_NDK_BINDGEN_FLAG_FILE))
+MODULE_SRCDEPS += $(LIBBINDER_NDK_BINDGEN_FLAG_FILE)
+
+include make/library.mk