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// Copyright 2016 Google Inc. 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.
package cc
// The platform needs to provide the following artifacts for the NDK:
// 1. Bionic headers.
// 2. Platform API headers.
// 3. NDK stub shared libraries.
// 4. Bionic static libraries.
//
// TODO(danalbert): All of the above need to include NOTICE files.
//
// Components 1 and 2: Headers
// The bionic and platform API headers are generalized into a single
// `ndk_headers` rule. This rule has a `from` property that indicates a base
// directory from which headers are to be taken, and a `to` property that
// indicates where in the sysroot they should reside relative to usr/include.
// There is also a `srcs` property that is glob compatible for specifying which
// headers to include.
//
// Component 3: Stub Libraries
// The shared libraries in the NDK are not the actual shared libraries they
// refer to (to prevent people from accidentally loading them), but stub
// libraries with dummy implementations of everything for use at build time
// only.
//
// Since we don't actually need to know anything about the stub libraries aside
// from a list of functions and globals to be exposed, we can create these for
// every platform level in the current tree. This is handled by the
// ndk_library rule.
//
// Component 4: Static Libraries
// The NDK only provides static libraries for bionic, not the platform APIs.
// Since these need to be the actual implementation, we can't build old versions
// in the current platform tree. As such, legacy versions are checked in
// prebuilt to development/ndk, and a current version is built and archived as
// part of the platform build. The platfrom already builds these libraries, our
// NDK build rules only need to archive them for retrieval so they can be added
// to the prebuilts.
//
// TODO(danalbert): Write `ndk_static_library` rule.
import (
"android/soong/android"
)
func init() {
android.RegisterModuleType("ndk_headers", ndkHeadersFactory)
android.RegisterModuleType("ndk_library", ndkLibraryFactory)
android.RegisterModuleType("preprocessed_ndk_headers", preprocessedNdkHeadersFactory)
android.RegisterSingletonType("ndk", NdkSingleton)
pctx.Import("android/soong/common")
}
func getNdkInstallBase(ctx android.PathContext) android.OutputPath {
return android.PathForOutput(ctx, "ndk")
}
// Returns the main install directory for the NDK sysroot. Usable with --sysroot.
func getNdkSysrootBase(ctx android.PathContext) android.OutputPath {
return getNdkInstallBase(ctx).Join(ctx, "sysroot")
}
// The base timestamp file depends on the NDK headers and stub shared libraries,
// but not the static libraries. This distinction is needed because the static
// libraries themselves might need to depend on the base sysroot.
func getNdkBaseTimestampFile(ctx android.PathContext) android.WritablePath {
return android.PathForOutput(ctx, "ndk_base.timestamp")
}
// The full timestamp file depends on the base timestamp *and* the static
// libraries.
func getNdkFullTimestampFile(ctx android.PathContext) android.WritablePath {
return android.PathForOutput(ctx, "ndk.timestamp")
}
func NdkSingleton() android.Singleton {
return &ndkSingleton{}
}
type ndkSingleton struct{}
func (n *ndkSingleton) GenerateBuildActions(ctx android.SingletonContext) {
var staticLibInstallPaths android.Paths
var installPaths android.Paths
var licensePaths android.Paths
ctx.VisitAllModules(func(module android.Module) {
if m, ok := module.(android.Module); ok && !m.Enabled() {
return
}
if m, ok := module.(*headerModule); ok {
installPaths = append(installPaths, m.installPaths...)
licensePaths = append(licensePaths, m.licensePath)
}
if m, ok := module.(*preprocessedHeaderModule); ok {
installPaths = append(installPaths, m.installPaths...)
licensePaths = append(licensePaths, m.licensePath)
}
if m, ok := module.(*Module); ok {
if installer, ok := m.installer.(*stubDecorator); ok {
installPaths = append(installPaths, installer.installPath)
}
if library, ok := m.linker.(*libraryDecorator); ok {
if library.ndkSysrootPath != nil {
staticLibInstallPaths = append(
staticLibInstallPaths, library.ndkSysrootPath)
}
}
}
})
combinedLicense := getNdkInstallBase(ctx).Join(ctx, "NOTICE")
ctx.Build(pctx, android.BuildParams{
Rule: android.Cat,
Description: "combine licenses",
Output: combinedLicense,
Inputs: licensePaths,
})
baseDepPaths := append(installPaths, combinedLicense)
// There's a dummy "ndk" rule defined in ndk/Android.mk that depends on
// this. `m ndk` will build the sysroots.
ctx.Build(pctx, android.BuildParams{
Rule: android.Touch,
Output: getNdkBaseTimestampFile(ctx),
Implicits: baseDepPaths,
})
fullDepPaths := append(staticLibInstallPaths, getNdkBaseTimestampFile(ctx))
ctx.Build(pctx, android.BuildParams{
Rule: android.Touch,
Output: getNdkFullTimestampFile(ctx),
Implicits: fullDepPaths,
})
}
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