Android P去掉DEX优化编译

分手后的思念是犯贱 2023-05-30 09:21 17阅读 0赞

Android P的系统编译中，采用了DEX优化编译。

### 单个apk或者jar去Dex编译 ###

在系统中编译出来的文件如下：  
oat  
\-arm64  
\-SystemUI.odex  
\-SystemUI.vdex  
SystemUI.apk

生成了后缀为odex和vdex的文件，在调式过程中，可能会出现问题。

去掉DEX优化编译的方法：  
1、mm WITH\_DEXPREOPT=false  
2、Android.mk中增加：LOCAL\_DEX\_PREOPT := false

### 整个系统去DEX编译 ###

make -j8 WITH\_DEXPREOPT=false  
报错:

ninja: no work to do.
    [1/1] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
    No need to regenerate ninja file
    Environment variable WITH_DEXPREOPT was set, regenerating...
    : error: : DEXPREOPT must be enabled for user and userdebug builds
    build/make/core/dex_preopt.mk:55: error: done.
    09:51:08 ckati failed with: exit status 1

修改build/make/core/dex\_preopt.mk

# Non eng linux builds must have preopt enabled so that system server doesn't run as interpreter
      # only. b/74209329
      ifeq (,$(filter eng, $(TARGET_BUILD_VARIANT)))
        ifneq (true,$(WITH_DEXPREOPT))
          ifneq (true,$(WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY))
            $(call pretty-error, DEXPREOPT must be enabled for user and userdebug builds)
          endif
        endif
      endif

将ifneq (true, ( W I T H D E X P R E O P T ) ) 改 为 i f e q ( t r u e , (WITH\_DEXPREOPT))改为ifeq (true, (WITHDEXPREOPT))改为ifeq(true,(WITH\_DEXPREOPT))或者ifneq (false,$(WITH\_DEXPREOPT))  
因为默认eng编译，WITH\_DEXPREOPT必须打开为true,否则提示编译报错。

即：非英文linux构建必须已启用preopt，以便系统服务器不会仅作为解释器运行。