Re: Debug Mode ENH 3/4: Add backtrace

[Jonathan Wakely <jwakely at redhat dot com>]

On 07/05/18 22:20 +0200, François Dumont wrote:
> Hi
>
>     Here is the patch to add backtrace info to debug assertion failure 
> output.
>
> Example:
>
> /home/fdt/dev/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/vector:188:
> In function:
>     std::__debug::vector<_Tp, _Allocator>::vector(_InputIterator,
>     _InputIterator, const _Allocator&) [with _InputIterator =
> std::reverse_iterator<__gnu_debug::_Safe_tagged_iterator<__gnu_cxx::__normal_iterator<int*,
>
>     std::vector<int> >, std::__debug::vector<int>,
>     std::random_access_iterator_tag> >; <template-parameter-2-2> = 
> void; _Tp
>     = int; _Allocator = std::allocator<int>]
>
> Backtrace:
>     ./debug_neg.exe() [0x4020c1]
>     ./debug_neg.exe() [0x400e59]
>     /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) 
> [0x7f13fc56e830]
>     ./debug_neg.exe() [0x400eb9]
>
> I tried to use add2line on the output address and it worked fine.
>
> Tested under Linux x86_64.
>
> I'll commit tomorrow if not told otherwise.
>
>     * src/c++11/debug.cc [_GLIBCXX_HAVE_EXECINFO_H]: Include execinfo.h.
>     [_GLIBCXX_HAVE_EXECINFO_H](_Error_formatter::_M_error): Render 
> backtrace.

Did you look into using libbacktrace? That resolves the addresses and
prints nice symbols. See the output of AddressSantizer for what it
looks like (I think that uses libbacktrace).