Create sysprop_library soong module

A newly introduced sysprop_library soong module will generate a
java_sdk_library and a cc_library from .sysprop description files.
Both Java modules and C++ modules can link against sysprop_library
module, thus giving consistency for using generated sysprop API.

As Java controls accessibility of Internal / System properties with
@hide and @SystemApi, 2 different header files will be created. And
build system will selectively expose depending on the property owner
and the place where the client libraries go into.

Bug: 80125326
Bug: 122170616
Test: 1) Create sysprop_library module.
Test: 2) Create empty txt files under prebuilts/sdk.
Test: 3) Create api directory, make update-api, and see changes.
Test: 4) Try to link against sysprop_library with various clients.
Test: 5) Soc_specific, Device_specific, Product_specific, recovery flags
work as intended.
Change-Id: I78dc5780ccfbb4b69e5c61dec26b94e92d43c333

1 files changed, 24 insertions, 1 deletions

diff --git a/cc/library.go b/cc/library.go
index a6c7bc87..a48b45db 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -67,6 +67,11 @@ type LibraryProperties struct {
 		Export_proto_headers *bool
 	}
 
+	Sysprop struct {
+		// Whether platform owns this sysprop library.
+		Platform *bool
+	}
+
 	Static_ndk_lib *bool
 
 	Stubs struct {
@@ -836,9 +841,27 @@ func (library *libraryDecorator) link(ctx ModuleContext,
 	}
 
 	if library.baseCompiler.hasSrcExt(".sysprop") {
-		flags := []string{
+		internalFlags := []string{
 			"-I" + android.PathForModuleGen(ctx, "sysprop", "include").String(),
 		}
+		systemFlags := []string{
+			"-I" + android.PathForModuleGen(ctx, "sysprop/system", "include").String(),
+		}
+
+		flags := internalFlags
+
+		if library.Properties.Sysprop.Platform != nil {
+			isProduct := ctx.ProductSpecific() && !ctx.useVndk()
+			isVendor := ctx.useVndk()
+			isOwnerPlatform := Bool(library.Properties.Sysprop.Platform)
+
+			useSystem := isProduct || (isOwnerPlatform == isVendor)
+
+			if useSystem {
+				flags = systemFlags
+			}
+		}
+
 		library.reexportFlags(flags)
 		library.reexportDeps(library.baseCompiler.pathDeps)
 		library.reuseExportedFlags = append(library.reuseExportedFlags, flags...)