From ed86cb711aae2ac0847ed90d43c187be812f3769 Mon Sep 17 00:00:00 2001 From: Steven Moreland Date: Thu, 13 Apr 2017 14:00:54 -0700 Subject: libnl: 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: m -j libnl Test: attempt to compile with BOARD_VNDK_VERSION := current Change-Id: I84c5f871cba9c0e67350e04f5e9f34489470f34e --- Android.bp | 1 + 1 file changed, 1 insertion(+) diff --git a/Android.bp b/Android.bp index 9013201c..53828f63 100644 --- a/Android.bp +++ b/Android.bp @@ -1,6 +1,7 @@ cc_library { name: "libnl", + vendor_available: true, srcs: [ "lib/cache.c", -- cgit v1.2.3