Re: Does __builtin_frame_address() work with C++ code?

[Ian Lance Taylor <iant@xxxxxxxxxx>]

On Mon, Jul 30, 2012 at 3:50 AM, Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx> wrote:
> I suspect that the answer is no. I don't seem to have much difficulty in
> getting __builtin_frame_address() to segfault when using C++ code, in gcc
> 4.7, like with the following example (on x86-64).

__builtin_frame_address works just as well for C++ as it does for C.
But in both cases whether it works with non-zero arguments depends on
the target and the compilation options.  It should normally work if
you compile with -fno-omit-frame-pointer.

> I'm looking at all the work that glibc's backtrace() does, and it's a far
> cry from what I see that __builtin_frame_address() generates.

Yes, the backtrace function is far more reliable.
__builtin_frame_address is intended to be a quick and dirty function
for debugging purposes.

Ian