android系统开发编译过程中的汇编错误

android系统开发移植alsa-lib库的过程中编译的时候出现了如下的错误：
错误1
/tmp/cckyaR40.s: Assembler messages:
/tmp/cckyaR40.s:2763: Error: selected processor does not support `mrs ip,cpsr'
/tmp/cckyaR40.s:2764: Error: unshifted register required -- `orr r2,ip,#128'
/tmp/cckyaR40.s:2765: Error: selected processor does not support `msr cpsr_c,r2'
/tmp/cckyaR40.s:2777: Error: selected processor does not support `msr cpsr_c,ip'
/tmp/cckyaR40.s:2945: Error: selected processor does not support `mrs r3,cpsr'
/tmp/cckyaR40.s:2946: Error: unshifted register required -- `orr r2,r3,#128'
/tmp/cckyaR40.s:2947: Error: selected processor does not support `msr cpsr_c,r2'
/tmp/cckyaR40.s:2959: Error: selected processor does not support `msr cpsr_c,r3'
/tmp/cckyaR40.s:3551: Error: selected processor does not support `mrs ip,cpsr'
/tmp/cckyaR40.s:3552: Error: unshifted register required -- `orr r1,ip,#128'
/tmp/cckyaR40.s:3553: Error: selected processor does not support `msr cpsr_c,r1'
/tmp/cckyaR40.s:3564: Error: selected processor does not support `msr cpsr_c,ip'
字面的意思报的是汇编错误，选择的处理器不支持mrs和msr指令。
原来的ARM指令有32位和16位两种指令模式，16位为thumb指令集，thumb指令集编译出的代码占用空间小，
而且效率也高，所以android的arm编译器默认用的是thumb模式编译，问题在于alsa的代码中有部分的内容
用到了32位的指令，所以才会报如下的错误，修改的方法也很简单，在Android.mk中加入如下内容即可：
LOCAL_ARM_MODE := arm
android的编译系统中LOCAL_ARM_MODE变量的取值为arm或者thumb，代表32位和16位两种arm指令集，
默认为thumb

错误2
target SharedLib: libasound (out/target/product/merlin/obj/SHARED_LIBRARIES/libasound_intermediates/LINKED/libasound.so)
/work/android-froyo-r3/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/bin/ld: out/target/product/merlin/obj/SHARED_LIBRARIES/libasound_intermediates/LINKED/libasound.so: version node not found for symbol snd_pcm_sw_params_get_start_threshold@ALSA_0.9
/work/android-froyo-r3/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin/../lib/gcc/arm-eabi/4.4.0/../../../../arm-eabi/bin/ld: failed to set dynamic section sizes: Bad value
collect2: ld returned 1 exit status
make: *** [out/target/product/merlin/obj/SHARED_LIBRARIES/libasound_intermediates/LINKED/libasound.so] 错误 1
解决此问题将alsa-lib/include/config.h文件中的如下宏定义去掉即可：
#define VERSIONED_SYMBOLS

 

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