Add C++ Host support on sysprop_library

With Host_supported: true, C++ part of sysprop_library will create host
variant which can be used from host modules. As there are no native
system property support on host, libbase functions will be used instead.
Adding support on host will help reduce code complexity of other
host_supported modules.

Bug: 147708854
Test: m, sysprop_test, manually test host binary
Change-Id: I850d91fea298ef1a0c16c6a7a9ec1aca5cf37e69

3 files changed, 31 insertions, 4 deletions

diff --git a/cc/testing.go b/cc/testing.go
index 60e5cf596..aceb8c8b4 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -188,6 +188,7 @@ func GatherRequiredDepsForTest(os android.OsType) string {
 			stl: "none",
 			vendor_available: true,
 			recovery_available: true,
+			host_supported: true,
 		}
 		cc_library {
 			name: "libc++",
@@ -197,6 +198,7 @@ func GatherRequiredDepsForTest(os android.OsType) string {
 			stl: "none",
 			vendor_available: true,
 			recovery_available: true,
+			host_supported: true,
 			vndk: {
 				enabled: true,
 				support_system_process: true,
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index ce404f8a7..65dbb22a9 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -144,6 +144,9 @@ type syspropLibraryProperties struct {
 	// list of .sysprop files which defines the properties.
 	Srcs []string `android:"path"`
 
+	// If set to true, build a variant of the module for the host.  Defaults to false.
+	Host_supported *bool
+
 	// Whether public stub exists or not.
 	Public_stub *bool `blueprint:"mutated"`
 }
@@ -306,12 +309,20 @@ type ccLibraryProperties struct {
 	Sysprop          struct {
 		Platform *bool
 	}
-	Header_libs        []string
-	Shared_libs        []string
+	Target struct {
+		Android struct {
+			Header_libs []string
+			Shared_libs []string
+		}
+		Host struct {
+			Static_libs []string
+		}
+	}
 	Required           []string
 	Recovery           *bool
 	Recovery_available *bool
 	Vendor_available   *bool
+	Host_supported     *bool
 }
 
 type javaLibraryProperties struct {
@@ -394,10 +405,12 @@ func syspropLibraryHook(ctx android.LoadHookContext, m *syspropLibrary) {
 	ccProps.Device_specific = proptools.BoolPtr(ctx.DeviceSpecific())
 	ccProps.Product_specific = proptools.BoolPtr(ctx.ProductSpecific())
 	ccProps.Sysprop.Platform = proptools.BoolPtr(isOwnerPlatform)
-	ccProps.Header_libs = []string{"libbase_headers"}
-	ccProps.Shared_libs = []string{"liblog"}
+	ccProps.Target.Android.Header_libs = []string{"libbase_headers"}
+	ccProps.Target.Android.Shared_libs = []string{"liblog"}
+	ccProps.Target.Host.Static_libs = []string{"libbase", "liblog"}
 	ccProps.Recovery_available = m.properties.Recovery_available
 	ccProps.Vendor_available = m.properties.Vendor_available
+	ccProps.Host_supported = m.properties.Host_supported
 	ctx.CreateModule(cc.LibraryFactory, &ccProps)
 
 	scope := "internal"
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index 7cad3da94..51da22205 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -161,6 +161,7 @@ func TestSyspropLibrary(t *testing.T) {
 			api_packages: ["android.sysprop"],
 			property_owner: "Platform",
 			vendor_available: true,
+			host_supported: true,
 		}
 
 		sysprop_library {
@@ -244,6 +245,11 @@ func TestSyspropLibrary(t *testing.T) {
 			static_libs: ["sysprop-platform", "sysprop-vendor"],
 		}
 
+		cc_library {
+			name: "libbase",
+			host_supported: true,
+		}
+
 		cc_library_headers {
 			name: "libbase_headers",
 			vendor_available: true,
@@ -256,6 +262,12 @@ func TestSyspropLibrary(t *testing.T) {
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
+			host_supported: true,
+		}
+
+		cc_binary_host {
+			name: "hostbin",
+			static_libs: ["sysprop-platform"],
 		}
 
 		llndk_library {