Debug Mode ENH 3/4: Add backtrace

[François Dumont]

Hi

 Â Â Â  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:
 Â Â Â  std::__debug::vector<_Tp, _Allocator>::vector(_InputIterator,
 Â Â Â  _InputIterator, const _Allocator&) [with _InputIterator =
std::reverse_iterator<__gnu_debug::_Safe_tagged_iterator<__gnu_cxx::__normal_iterator<int*, 

 Â Â Â  std::vector<int> >, std::__debug::vector<int>,
 Â Â Â  std::random_access_iterator_tag> >; <template-parameter-2-2> = 
void; _Tp
 Â Â Â  = int; _Allocator = std::allocator<int>]

Backtrace:
 Â Â Â  ./debug_neg.exe() [0x4020c1]
 Â Â Â  ./debug_neg.exe() [0x400e59]
 Â Â Â  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) 
[0x7f13fc56e830]
 Â Â Â  ./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.

 Â Â Â  * src/c++11/debug.cc [_GLIBCXX_HAVE_EXECINFO_H]: Include execinfo.h.
 Â Â Â  [_GLIBCXX_HAVE_EXECINFO_H](_Error_formatter::_M_error): Render 
backtrace.

François

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