From 5b180070b6f707be1717fdbb9f83954662e3efde Mon Sep 17 00:00:00 2001 From: Dan Willemsen Date: Fri, 7 Apr 2017 14:15:17 -0700 Subject: [PATCH] Mark as vendor_available By setting vendor_available, the following may become true: * a prebuilt library from this release may be used at runtime by in a later releasse (by vendor code compiled against this release). so this library shouldn't depend on runtime state that may change in the future. * this library may be loaded twice into a single process (potentially an old version and a newer version). The symbols will be isolated using linker namespaces, but this may break assumptions about 1 library in 1 process (your singletons will run twice). Background: This means that these modules may be built and installed twice -- once for the system partition and once for the vendor partition. The system version will build just like today, and will be used by the framework components on /system. The vendor version will build against a reduced set of exports and libraries -- similar to, but separate from, the NDK. This means that all your dependencies must also mark vendor_available. At runtime, /system binaries will load libraries from /system/lib*, while /vendor binaries will load libraries from /vendor/lib*. There are some exceptions in both directions -- bionic(libc,etc) and liblog are always loaded from /system. And SP-HALs (OpenGL, etc) may load /vendor code into /system processes, but the dependencies of those libraries will load from /vendor until it reaches a library that's always on /system. In the SP-HAL case, if both framework and vendor libraries depend on a library of the same name, both versions will be loaded, but they will be isolated from each other. It's possible to compile differently -- reducing your source files, exporting different include directories, etc. For details see: https://android-review.googlesource.com/368372 None of this is enabled unless the device opts into the system/vendor split with BOARD_VNDK_VERSION := current. Bug: 36426473 Bug: 36079834 Test: Android-aosp_arm.mk is the same before/after Test: build.ninja is the same before/after Test: build-aosp_arm.ninja is the same before/after Test: attempt to compile with BOARD_VNDK_VERSION := current Change-Id: Ia4eb5378d941033b07673daf682e66051cd3c075 --- Android.bp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Android.bp b/Android.bp index 2c46ce9a..739cb6d6 100644 --- a/Android.bp +++ b/Android.bp @@ -3,6 +3,7 @@ cc_library_headers { name: "libhardware_headers", export_include_dirs: ["include"], + vendor_available: true, } cc_library_shared { @@ -17,6 +18,7 @@ cc_library_shared { header_libs: ["libsystem_headers"], cflags: ["-DQEMU_HARDWARE"], export_include_dirs: ["include"], + vendor_available: true, } subdirs = [