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author | Dan Willemsen <dwillemsen@google.com> | 2017-04-07 14:11:56 -0700 |
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committer | Dan Willemsen <dwillemsen@google.com> | 2017-04-10 21:26:34 -0700 |
commit | c41479a1d7de7fe6e9cfbff9be21382f7b23ace7 (patch) | |
tree | dc7aafe37f586254e5c753ab9d72c03e6f42db2e | |
parent | 80aa93fba4509a75b591d33941be1d0bf8989363 (diff) | |
download | libcxxabi-o-iot-preview-5.tar.gz |
Mark as vendor_availableandroid-wear-o-preview-4android-wear-o-preview-3android-o-preview-4android-o-preview-3android-o-preview-2android-o-iot-preview-5android-n-iot-preview-4o-iot-preview-5n-iot-preview-4
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: If1f75688d3fd42aaaf6b150771573d0d6f3afb34
-rw-r--r-- | Android.bp | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -17,6 +17,7 @@ cc_library_static { name: "libc++abi", host_supported: true, + vendor_available: true, clang: true, srcs: [ "src/abort_message.cpp", |