I want to build audioserver(/frameworks/av/media/audioserver) to 64-bit, 
and refer to the instructions in Android.mk 
(/frameworks/av/media/audioserver/Android.mk)


I add AUDIOSERVER_MULTILIB :=64 in device.mk, but it can't startup,  check 
the log and find the following error. 

01-20 09:44:31.637 2581 2581 F linker : CANNOT LINK EXECUTABLE 
"/system/bin/audioserver": unsupported ELF TLS DT entry in 
"/system/lib64/libaudioflinger.so"


Also, use FILE command to check if it's 64 bit:


#audioserver

console:/system/bin # file audioserver audioserver: ELF shared object, 
64-bit LSB arm64, dynamic (/system/bin/linker64), for Android 28, 
BuildID=01599, stripped


#.so

console:/system/lib64 # file libaudioflinger.so libaudioflinger.so: ELF 
shared object, 64-bit LSB arm64, for Android 28, BuildID=fd41f, stripped


in /frameworks/av/media/audioserver/Android.mk

# If AUDIOSERVER_MULTILIB in device.mk is non-empty then it is used to control# 
the LOCAL_MULTILIB for all audioserver exclusive libraries.# This is relevant 
for 64 bit architectures where either or both# 32 and 64 bit libraries may be 
built.## AUDIOSERVER_MULTILIB may be set as follows:#   32      to build 32 bit 
audioserver libraries and 32 bit audioserver.#   64      to build 64 bit 
audioserver libraries and 64 bit audioserver.#   both    to build both 32 bit 
and 64 bit libraries,#           and use primary target architecture (32 or 64) 
for audioserver.#   first   to build libraries and audioserver for the primary 
target architecture only.#   <empty> to build both 32 and 64 bit libraries and 
32 bit audioserver.


it should be work normally when specifying AUDIOSERVER_MULTILIB := 64

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