[PATCH] mtrace: record backtrace of memory allocation/deallocation

[Joseph Myers]

Some general observations:

* We'll need a copyright assignment (and employer assignment / disclaimer 
if applicable) on file at the FSF to consider this patch.

* A new feature needs documenting both in the glibc manual (memory.texi in 
this case) and with a NEWS file entry.

* A new feature should also have testcases added.

* An mtrace.pl option would be needed to specify the addr2line program to 
use, for cross-compilation cases.  That option would need to be used in 
the testcases.  See bug 23681 for discussion of the proper form configure 
tests for such binutils programs should take.

-- 
Joseph S. Myers
joseph@codesourcery.com