can't resolve symbol '_Unwind_Backtrace'

Mon Apr 21 14:54:00 GMT 2008

ffileppo wrote:
>> ffileppo wrote:
>>> Hi,
>>>>>> I'm getting this error when I try to run a gcj exe on my target (arm-linux, cpu PXA270):
>>>>>> ./a.out: can't resolve symbol '_Unwind_Backtrace'
>> Hmm, doesn't look like armel.
>>>> Which ABI is this? New or old ARM ABI? What version of gcc?
>>>> The me what `uname -a' returns.
>>>> Andrew.
>>>> How can I check which ABI I'm using?
>> I used GCC 4.3 to compile arm-linux-gcj; the rootfs of the target was built using gcc 4.2.3 (with uclibc), I don't know it is important though.
>> You mean "uname -a" of my target right?
> It tells:
> Linux uclibc 2.6.22.6 #72 Mon Apr 21 15:34:00 CEST 2008 armv5tel unknown

OK, that's the new ABI: the "el" on the end of the name tells us that.
I'm wondering if maybe you have an old version of libgcc on the
target and a new version in the x-compiler. Run your program in
gdb and then do "info share". It'll tell you which libgcc you're 
using.
Your newly built libgcc_s.so will be somewhere like
x-arm/install/arm-linux/lib/libgcc_s.so
and this is the one you want in your LD_LIBRARY_PATH on your target.
Copy everything in x-arm/install/arm-linux/lib to your target.
zorro:~ $ nm x-arm/install/arm-linux/lib/libgcc_s.so | grep Backtrace
000075c0 T _Unwind_Backtrace
Andrew.