f09c8437f9
Singleton rules need to manually specify Optional: true, or they will be built for any ninja invocation that has no targets specified. Test: m -j on tradefed build Change-Id: Ifc060b25bc32e664c48731eb8a0d963b73574591
113 lines
4 KiB
Go
113 lines
4 KiB
Go
// Copyright 2016 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cc
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// The platform needs to provide the following artifacts for the NDK:
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// 1. Bionic headers.
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// 2. Platform API headers.
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// 3. NDK stub shared libraries.
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// 4. Bionic static libraries.
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//
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// TODO(danalbert): All of the above need to include NOTICE files.
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//
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// Components 1 and 2: Headers
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// The bionic and platform API headers are generalized into a single
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// `ndk_headers` rule. This rule has a `from` property that indicates a base
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// directory from which headers are to be taken, and a `to` property that
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// indicates where in the sysroot they should reside relative to usr/include.
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// There is also a `srcs` property that is glob compatible for specifying which
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// headers to include.
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//
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// Component 3: Stub Libraries
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// The shared libraries in the NDK are not the actual shared libraries they
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// refer to (to prevent people from accidentally loading them), but stub
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// libraries with dummy implementations of everything for use at build time
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// only.
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//
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// Since we don't actually need to know anything about the stub libraries aside
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// from a list of functions and globals to be exposed, we can create these for
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// every platform level in the current tree. This is handled by the
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// ndk_library rule.
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//
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// Component 4: Static Libraries
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// The NDK only provides static libraries for bionic, not the platform APIs.
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// Since these need to be the actual implementation, we can't build old versions
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// in the current platform tree. As such, legacy versions are checked in
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// prebuilt to development/ndk, and a current version is built and archived as
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// part of the platform build. The platfrom already builds these libraries, our
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// NDK build rules only need to archive them for retrieval so they can be added
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// to the prebuilts.
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//
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// TODO(danalbert): Write `ndk_static_library` rule.
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import (
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"github.com/google/blueprint"
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"android/soong"
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"android/soong/android"
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)
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func init() {
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soong.RegisterModuleType("ndk_headers", ndkHeadersFactory)
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soong.RegisterModuleType("ndk_library", ndkLibraryFactory)
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soong.RegisterSingletonType("ndk", NdkSingleton)
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pctx.Import("android/soong/common")
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}
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func getNdkInstallBase(ctx android.ModuleContext) android.OutputPath {
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return android.PathForOutput(ctx, "ndk")
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}
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// Returns the main install directory for the NDK sysroot. Usable with --sysroot.
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func getNdkSysrootBase(ctx android.ModuleContext) android.OutputPath {
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return getNdkInstallBase(ctx).Join(ctx, "sysroot")
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}
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func getNdkSysrootTimestampFile(ctx android.PathContext) android.Path {
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return android.PathForOutput(ctx, "ndk.timestamp")
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}
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func NdkSingleton() blueprint.Singleton {
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return &ndkSingleton{}
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}
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type ndkSingleton struct{}
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func (n *ndkSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
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installPaths := []string{}
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ctx.VisitAllModules(func(module blueprint.Module) {
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if m, ok := module.(*headerModule); ok {
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installPaths = append(installPaths, m.installPaths...)
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}
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})
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ctx.VisitAllModules(func(module blueprint.Module) {
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if m, ok := module.(*Module); ok {
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if installer, ok := m.installer.(*stubDecorator); ok {
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installPaths = append(installPaths, installer.installPath)
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}
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}
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})
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// There's a dummy "ndk" rule defined in ndk/Android.mk that depends on
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// this. `m ndk` will build the sysroots.
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ctx.Build(pctx, blueprint.BuildParams{
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Rule: android.Touch,
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Outputs: []string{getNdkSysrootTimestampFile(ctx).String()},
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Implicits: installPaths,
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Optional: true,
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})
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}
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