Merge changes Ife723733,I68acfb53,Id216c35d,Id0569831,Iadac88f8, ...

* changes:
  Add system/media/audio/include to commonGlobalIncludes
  Add -Werror=date-time to target builds
  DeviceUsesClang should default to true
  clang now supports -fdebug-prefix-map=.
  Turn on ninja errors for duplicate rules
  Update to use the latest clang-2629532

cc/cc.go

@@ -94,6 +94,7 @@ var (
 		"-Werror=non-virtual-dtor",
 		"-Werror=address",
 		"-Werror=sequence-point",
+		"-Werror=date-time",
 	}
 
 	hostGlobalCflags = []string{}
@@ -128,6 +129,7 @@ func init() {
 	pctx.PrefixedPathsForOptionalSourceVariable("commonGlobalIncludes", "-isystem ",
 		[]string{
 			"system/core/include",
+			"system/media/audio/include",
 			"hardware/libhardware/include",
 			"hardware/libhardware_legacy/include",
 			"hardware/ril/include",
@@ -142,7 +144,7 @@ func init() {
 	pctx.PrefixedPathsForOptionalSourceVariable("commonNativehelperInclude", "-I",
 		[]string{"libnativehelper/include/nativehelper"})
 
-	pctx.SourcePathVariable("clangPath", "prebuilts/clang/host/${HostPrebuiltTag}/3.8/bin")
+	pctx.SourcePathVariable("clangPath", "prebuilts/clang/host/${HostPrebuiltTag}/clang-2629532/bin")
 }
 
 type CCModuleContext common.AndroidBaseContext

cc/clang.go

@@ -31,7 +31,6 @@ var clangUnknownCflags = sorted([]string{
 	"-Wunused-but-set-parameter",
 	"-Wunused-but-set-variable",
 	"-fdiagnostics-color",
-	"-fdebug-prefix-map=/proc/self/cwd=",
 
 	// arm + arm64 + mips + mips64
 	"-fgcse-after-reload",

common/config.go

@@ -261,7 +261,7 @@ func (c *config) DeviceUsesClang() bool {
 	if c.ProductVariables.DeviceUsesClang != nil {
 		return *c.ProductVariables.DeviceUsesClang
 	}
-	return false
+	return true
 }
 
 func (c *config) ResourceOverlays() []SourcePath {

soong.bash

@@ -40,4 +40,4 @@ if [ -f "${ENVFILE}" ]; then
     fi
 fi
 
-"prebuilts/ninja/${PREBUILTOS}/ninja" -f "${BUILDDIR}/build.ninja" "$@"
+"prebuilts/ninja/${PREBUILTOS}/ninja" -f "${BUILDDIR}/build.ninja" -w dupbuild=err "$@"