5f5056f503
Now that the emulator supports proper ARMv7 emulation, switch to
building all emulator-specific platform images using this instruction
set, in order to benefit from the noticeable speed boost provided by
Thumb-2 instructions.
Note that we don't build with NEON support because emulated NEON
instructions are currently slow, though they work.
IMPORTANT: You need to have the following emulator patch in your tree
in order to start these platform builds easily:
https://review.source.android.com//#change,23798
Otherwise, the alternative is to do these things:
1/ Telling the emulator to emulate an ARMv7-A CPU, instead of
an ARMv5TE one. This is normally done with "-qemu cortex-a8"
2/ Using an ARMv7-A capable kernel image, which is available and
usable with -kernel prebuilt/android-arm/kernel-qemu-armv7
Note that the emulator has a special hack that automatically enables
1/ if 2/ is being used (i.e. if the kernel image name ends with -armv7,
then emulate an ARMv7-A CPU automatically).
So in reality, only 2/ is required.
Change-Id: I5c0245ba5e6a2bc34d0d49b2c024fffd317a5eed
33 lines
1002 B
Makefile
33 lines
1002 B
Makefile
# config.mk
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#
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# Product-specific compile-time definitions.
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#
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# The generic product target doesn't have any hardware-specific pieces.
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TARGET_NO_BOOTLOADER := true
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TARGET_NO_KERNEL := true
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# Note: we build the platform images for ARMv7-A _without_ NEON.
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#
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# Technically, the emulator supports ARMv7-A _and_ NEON instructions, but
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# emulated NEON code paths typically ends up 2x slower than the normal C code
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# it is supposed to replace (unlike on real devices where it is 2x to 3x
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# faster).
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#
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# What this means is that the platform image will not use NEON code paths
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# that are slower to emulate. On the other hand, it is possible to emulate
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# application code generated with the NDK that uses NEON in the emulator.
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#
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TARGET_ARCH_VARIANT := armv7-a
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TARGET_CPU_ABI := armeabi-v7a
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TARGET_CPU_ABI2 := armeabi
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HAVE_HTC_AUDIO_DRIVER := true
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BOARD_USES_GENERIC_AUDIO := true
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# no hardware camera
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USE_CAMERA_STUB := true
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# Set /system/bin/sh to mksh, not ash, to test the transition.
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TARGET_SHELL := mksh
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