Add Relocation Packer support
This only applies to shared libraries on the device, and like stripping,
we'll let make do the actual packing if we're embedded in Make.
Change-Id: I1585d74ecfc41e18dcbb5ffb70005adf007cc941
diff --git a/cc/relocation_packer.go b/cc/relocation_packer.go
new file mode 100644
index 0000000..c509f31
--- /dev/null
+++ b/cc/relocation_packer.go
@@ -0,0 +1,84 @@
+// 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
+
+import (
+ "runtime"
+
+ "github.com/google/blueprint"
+
+ "android/soong/android"
+)
+
+func init() {
+ pctx.SourcePathVariable("relocationPackerCmd", "prebuilts/misc/${config.HostPrebuiltTag}/relocation_packer/relocation_packer")
+}
+
+var relocationPackerRule = pctx.AndroidStaticRule("packRelocations",
+ blueprint.RuleParams{
+ Command: "rm -f $out && cp $in $out && $relocationPackerCmd $out",
+ CommandDeps: []string{"$relocationPackerCmd"},
+ Description: "pack relocations $out",
+ })
+
+type RelocationPackerProperties struct {
+ Pack_relocations *bool `android:"arch_variant"`
+
+ // This will be true even if we're embedded in Make, in which case
+ // we'll defer to make to actually do the packing.
+ PackingRelocations bool `blueprint:"mutated"`
+}
+
+type relocationPacker struct {
+ Properties RelocationPackerProperties
+}
+
+func (p *relocationPacker) packingInit(ctx BaseModuleContext) {
+ enabled := true
+ // Relocation packer isn't available on Darwin yet
+ if runtime.GOOS == "darwin" {
+ enabled = false
+ }
+ if ctx.Target().Os != android.Android {
+ enabled = false
+ }
+ if ctx.AConfig().Getenv("DISABLE_RELOCATION_PACKER") == "true" {
+ enabled = false
+ }
+ if ctx.sdk() {
+ enabled = false
+ }
+ if p.Properties.Pack_relocations != nil &&
+ *p.Properties.Pack_relocations == false {
+ enabled = false
+ }
+
+ p.Properties.PackingRelocations = enabled
+}
+
+func (p *relocationPacker) needsPacking(ctx ModuleContext) bool {
+ if ctx.AConfig().EmbeddedInMake() {
+ return false
+ }
+ return p.Properties.PackingRelocations
+}
+
+func (p *relocationPacker) pack(ctx ModuleContext, in, out android.ModuleOutPath, flags builderFlags) {
+ ctx.ModuleBuild(pctx, android.ModuleBuildParams{
+ Rule: relocationPackerRule,
+ Output: out,
+ Input: in,
+ })
+}