Google Android改了什么 zlib

base on

zlib 1.2.8

, no bugfix

Add

Android.mk

, delete

Makefile

setup

LOCAL_ARM_MODE := arm

Android ARM指令模式有32位和16位两种,16位为thumb指令集,编译生成代码占用空间小,效率高,所以默认使用thumb模式.

测试证明: zlib在ARM 32位指令集模式下速度快1.17倍.

measurements show that the ARM version of ZLib is about x1.17 faster than the thumb one...

setup

LOCAL_CFLAGS += -O3 -DUSE_MMAP

USE_MMAP

宏仅在

test/minigzip.c

使用.

setup

LOCAL_LDFLAGS_arm := -Wl,--hash-style=both

其他bug引起.

This is to work around b/24465209. Remove after root cause is fixed