Re: addr2line format specifiers

Fri, 24 Feb 2012 13:41:19 -0800 

The older GNU extension is %as or %a[ and %ms/%m[ was added after C99
usurped %a.  Newer GNU implementations support both in that %a is a flag if
followed by s or [ and a specifier otherwise.  Hence the code is correct
for portability to both old and new GNU C libraries.
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