backtrace() vs. _Unwind_Backtrace()

Fri Dec 5 17:23:00 GMT 2003

Andrew Haley wrote:
> > 
> > But in that case, HAVE_BACKTRACE should be turned on for ia64 Linux.
>>Good.
>> > Older versions of libc have a broken backtrace() on that platform,
> > but even that can be worked around by doing:
> > 
> > 	LD_PRELOAD=/usr/lib/libunwind-ia64.so.1
> > 
> > and with newer versions of libc, backtrace() will use _Unwind_Backtrace().
>>But we need to build a version of libgcj for ia64 Linux that works
>without needing a special LD_PRELOAD.
>>>The approach for the MIPS port of libgcj is to include a backtrace() 
replacement that calls _Unwind_Backtrace(). This works because 
backtrace() is a weak symbol in glibc. It sounds like this is 
essentially what you are suggesting.
As I said in the previous message this code is in 
sysdep/dwarf2-backtrace.cc.
David Daney