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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
Merged-In: I7625075aea9c5c8b1ffdc8794776df624365263a
Change-Id: I7625075aea9c5c8b1ffdc8794776df624365263a
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d77f86d9a5
am: a307a48ab8
Change-Id: I969f5fa9196c8029dbda4d7590d691c653ff51fb
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Bug: 31559095
Test: Test linux_bionic compile
Change-Id: I568cd49ffbd30217b0af7185e85051cc22f97299
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external/lzma/C/Lzma2Enc.c:241:21: warning: comparison of integers of different signs: 'UInt64' (aka 'unsigned long long') and 'int' [-Wsign-compare]
if (numBlocks < t2)
~~~~~~~~~ ^ ~~
Test: builds without warnings
Change-Id: I65bb8ebbf679855bbe02ddce431be2f328a062b4
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Change-Id: If48cc84de147d7e6dc0c6143ef93711309fa8379
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It is needed by simpleperf to read .gnu_debugdata section in elf files.
Bug: 27744639
Change-Id: I118cc1b5f518cc221f0c5e545ea0c9ffd78f41e2
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Change-Id: I3081310cc629b4b8e39436f1ee3b47d5a8ff69b0
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Change-Id: Ied8ad15a52c68a392b7d642498fba743c5341be5
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