1// Copyright 2017 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package cc
16
17import (
18	"android/soong/android"
19)
20
21type kernelHeadersDecorator struct {
22	*libraryDecorator
23}
24
25func (stub *kernelHeadersDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path {
26	if ctx.Device() {
27		f := &stub.libraryDecorator.flagExporter
28		f.reexportSystemDirs(android.PathsForSource(ctx, ctx.DeviceConfig().DeviceKernelHeaderDirs())...)
29		f.setProvider(ctx)
30	}
31	return stub.libraryDecorator.linkStatic(ctx, flags, deps, objs)
32}
33
34// kernel_headers retrieves the list of kernel headers directories from
35// TARGET_BOARD_KERNEL_HEADERS and TARGET_PRODUCT_KERNEL_HEADERS variables in
36// a makefile for compilation. See
37// https://android.googlesource.com/platform/build/+/master/core/config.mk
38// for more details on them.
39func kernelHeadersFactory() android.Module {
40	module, library := NewLibrary(android.HostAndDeviceSupported)
41	library.HeaderOnly()
42
43	stub := &kernelHeadersDecorator{
44		libraryDecorator: library,
45	}
46
47	module.linker = stub
48
49	return module.Init()
50}
51
52func init() {
53	android.RegisterModuleType("kernel_headers", kernelHeadersFactory)
54}
55