[LLVMdev] Wrong Dwarf info with -O2? [PowerPC]

[Joerg Sonnenberger]

On Thu, May 10, 2012 at 03:24:01PM +0200, Gabor Greif wrote:
> Hi all,
> 
> today I was debugging some code (compiled by a 2 weeks old clang) on a
> PowerPC embedded system using the newest gdb (v7.4).
> 
> I got a backtrace like this:
> 
> (gdb) bt
> #0  0x0fe96314 in poll () from /lib/tls/libc.so.6
> #1  0x1002c8ac in mli_poll (
>     fds=<error reading variable: Unhandled dwarf expression opcode 0x1>,
>     nfds=<optimized out>, timeout=<optimized out>) at msglib.c:7560
> #2  0x10027684 in mli_do_work (peer_index=<optimized out>,
>     creply=<error reading variable: Unhandled dwarf expression opcode 0xff>,
>     flags=<optimized out>) at msglib.c:6323
> #3  0x1002cce8 in ml_wait_for_next_event () at msglib.c:6821
> #4  0x1000fdd0 in sys_mainloop () at config.c:1221
> #5  0x1000bda8 in main (argc=<optimized out>, argv=<optimized out>)
>     at sysmon.c:437
> 
> 
> Please note the "Unhandled dwarf expression"  errors. Is this a known
> problem? How can I help debugging this? Btw., this is dead-simple C
> code.

Please add what you have to:

http://llvm.org/bugs/show_bug.cgi?id=12733

Joerg