[Libunwind-devel] Function names in C++ program: an interesting behavior by libunwind

[Shravan Gaonkar]

Hi guys,
 I modified C program to C++ to test the if libunwind works and
generates the function names with C++

1. When I compile the GtestSimple.cxx on bsd and run it. I dont get
function names.

Backtrace across signal handler on alternate stack:
sighandler: got signal 15, sp=0x2830a4d0 @ 28297e17
        explicit backtrace:
0000000008048a9c                                  (sp=000000002830a3f0)
        proc=8048a70-8048d04

2. If I try to use gdb to find what the problem is, I get the function names.

3. After exiting from the gdb, If I still continue to run the program
I get the function name until I recompile the
program, after which I am back to state 1.

Backtrace across signal handler:
sighandler: got signal 15, sp=0xbfbfe8f0 @ 28297e17
        explicit backtrace:
0000000008048a9c <_Z12do_backtracev+0x2c>         (sp=00000000bfbfe810)
        proc=8048a70-8048d04

Any thoughts on such a behavior?


Shravan
p.s: I have attached the modified file and the maketest script. You
can put them in libunwind/tests folder to make your life easy to
compile

i am testing on freebsd 7.2 32 bit mode

Gtest-simple.cxx
Description: Binary data

maketest
Description: Binary data