This change basically ported our target multilib to the host side.
It supports 2 host build modes: x86 and x86_64 multilib build.
For now you need to set "BUILD_HOST_64bit=true" to switch to x86_64
multilib build. Later we'll default to x86_64 build and have a flag
to force 32-bit only build, which may be needed by SDK build.
In host module definition, like in target ones, you can use the
following
LOCAL variables to set up multilib configuration:
LOCAL_MULTILIB: can be "both", "first", "32" or "64".
It also supports the same set of arch or 32-vs-64 specific LOCAL
variables.
By default, it builds only for the first arch.
To keep path compatibility, in x86_64 build files are still output to
out/host/linux-x86; Both 32-bit and 64-bit executables are in
out/host/linux-86/bin;
In x86_64 build 32-bit shared libraries are installed to
out/host/linux-x86/lib32
and 64-bit shared libraries are installed to out/host/linux-x86/lib;
32-bit object files are output to out/host/linux-x86/obj32 and 64-bit
object files
are output to out/host/linux-x86/obj.
Bug: 13751317
Change-Id: I6044f83b7db369a33e05209e8c588eb6dc83409f
Introduce two new flags, TARGET_PREFER_32_BIT_APPS and
TARGET_PREFER_32_BIT_EXECUTABLES that individually control
compilation of apps and executables. If TARGET_PREFER_32_BIT is
set, the build system will automatically set both new flags.
Change-Id: Ibd2165e688675c2884d9e7ddf82d7dd6c28521f3
TARGET_PREFER_32_BIT can't assume that the 32-bit rule is allowed,
it needs to try the 32-bit rule first, then fall back to the 64-bit
rule in case the module specifies LOCAL_MODULE_TARGET_ARCH or
LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH to disallow the 32-bit build.
Also port TARGET_PREFER_32_BIT to package.mk.
Change-Id: I07520b75c4ee11a1e95a82b3afa2a33d4907eb04
LOCAL_MULTILIB replaces LOCAL_32_BIT_ONLY and
LOCAL_NO_2ND_ARCH, although both are still supported.
Set LOCAL_MULTILIB := 32 to always build a module 32-bit.
This is the same as specifying LOCAL_32_BIT_ONLY.
Set LOCAL_MULTILIB := first to always build a module for
the first architecture (64-bit on a 64-bit target, 32-bit on a
32-bit target). This is the same as specifying LOCAL_NO_2ND_ARCH.
Set LOCAL_MULTILIB := both to build for both architectures
on a mulitlib (64-bit) target.
If LOCAL_MULTILIB is not set libraries will default to "both",
and executables, packages, and prebuilts will default to building
for the first architecture if supported by the module, otherwise
the second.
Executables that set LOCAL_MULTILIB := both must set either
LOCAL_MODULE_STEM_32 and LOCAL_MODULE_STEM_64 or
LOCAL_MODULE_PATH_32 and LOCAL_MODULE_PATH_64 to specify how to
differentiate the install locations of the two versions.
Change-Id: I22ab6aa342b231c307b1d8a86cea4fd91eea39f5
Add four new variables for module makefiles:
LOCAL_MODULE_TARGET_ARCH specifies that a module is only supported for
one or more architectures. Any architecture not in the list will be
not attempt to build the module. The expected use case is prebuilts
that are only suitable for a single architecture, or modules like llvm
that need per-architecture support.
LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH specifies that a module cannot be
built for one or more architectures.
LOCAL_MODULE_TARGET_ARCH_WARN and LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH_WARN
are the same, but warn that the arch is not supported, which is useful
for modules that are critical but not yet working.
The logic for whether or not to build an architecture is fairly
complicated, so this patch consolidates it into module_arch_supported.mk
Change-Id: I120caf4a375f484e1fd6017b60c2f53882ae01e6
-- Added TARGET_PREFER_32_BIT, which sets LOCAL_32_BIT_ONLY for an
executable, if LOCAL_NO_2ND_ARCH is not true.
Name resolving in 64-bit multilib build:
-- Name resolving in PRODUCT_PACKAGES:
foo:32 resolves to foo_32;
foo:64 resolves to foo;
foo resolves to both foo and foo_32 (if foo_32 is defined).
-- Name resolving for LOCAL_REQUIRED_MODULES:
If a module is built for 2nd arch, its required module resolves to
32-bit variant, if it exits;
Otherwise for executable and shared library, a required module
resolves to the default 64-bit variant; for other module classes,
required module foo resolves to both foo and foo_32 (if foo_32 is
defined)
Bug: 12898862
Change-Id: I5fda1a77f58814097b10b5ad2743ee25adfaecc4
By default, an executable is built for TARGET_ARCH.
To build it for TARGET_2ND_ARCH in a 64bit product, use:
LOCAL_32BIT_ONLY := true
To skip a module for TARGET_2ND_ARCH, use:
LOCAL_NO_2ND_ARCH := true
Bug: 11654773
Change-Id: Ieb293d25b21024bfe1b554044df338e064ac7b46
Use "LOCAL_SDK_VERSION := <number>" to build against the NDK when you
include $(BUILD_EXECUTABLE).
Bug: 7170098
Change-Id: I4cebeae3355e79a4d2f2f5549ef0613ced77e3f0
This patch removes support for prelinking from the build system. By now, the
prelinker has outlived its usefulness for several reasons. Firstly, the
speedup that it afforded in the early days of Android is now nullified by the
speed of hardware, as well as by the presence of Zygote. Secondly, the space
savings that come with prelinking (measued at 17MB on a recent honeycomb
stingray build) are no longer important either. Thirdly, prelinking reduces
the effectiveness of Address-Space-Layout Randomization. Finally, since it is
not part of the gcc suite, the prelinker needs to be maintained separately.
The patch deletes apriori, soslim, lsd, isprelinked, and iself from the source
tree. It also removes the prelink map.
LOCAL_PRELINK_MODULE becomes a no-op. Individual Android.mk will get cleaned
separately. Support for prelinking will have to be removed from the recovery
code and from the dynamic loader as well.
Change-Id: I5839c9c25f7772d5183eedfe20ab924f2a7cd411
Ying Wang