For my thesis, I'm modifying the android framework and building the source (4.1.1 Jelly Bean). I can do a full build, but because this is very time consuming (I'm developing on a ubuntu 12.04 64bit virtual machine) I'd like to build separate modules.
For example: When doing changes to the location modules, it should be possible to just build the changed module, and make a new system image:
mmm frameworks/base
make snod
But this doesn't work. Every time I try to boot, the new system image won't boot because of:
I/dalvikvm( 1696): DexOpt: mismatch dep signature for '/system/framework/framework.odex'
After some research, I tried to disable dexpreopt with the enviroment variables
export $WITH_DEXPREOPT=false
and
export $DISABLE_DEXPREOPT=true
and doing a full rebuild with 'make installclean'. The full rebuild works, and the changes to the framework are present in the build. But after doing a new change, still 'mmm frameworks/base' and 'make snod' result in dexpreopt mismatch.
The build/core/makefile from 'make snod' also gives the warning: 'Warning: with dexpreopt enabled, you may need a full rebuild.', which comes from this line in the makefile:
ifeq (true,$(WITH_DEXPREOPT))
$(warning Warning: with dexpreopt enabled, you may need a full rebuild.)
endif
This leads me to believe the $WITH_DEXPREOPT variable isn't correctly set or read? So far I haven't been able to get a bootable system image without doing a clean full rebuild. Is the procedure I follow the correct to disable dexpreopt, or are there any other ways to build separate modules after doing changes to the framework and getting a new system image?
Build target is 'full-eng'.
Apparently the WITH_DEXPREOPT environment variable is overwritten by an internal WITH_DEXPREOPT variable in
build/target/board/generic/BoardConfig.mk
Changing this to false, or according to the people at google groups, starting a make with:
make showcommands WITH_DEXPREOPT=false
does the trick. Building a specific module and making a new system image now results in a bootable build.
(source: https://groups.google.com/d/topic/android-building/vJCkg8Yq9Ic/discussion )
来源：https://stackoverflow.com/questions/13135844/building-separate-android-modules-with-dexpreopt-disabled