Patch RFC: Use internal qsort function in libbacktrace

[Steven Bosscher]

On Wed, Mar 5, 2014 at 10:25 AM, Richard Biener wrote:
> On Wed, Mar 5, 2014 at 4:34 AM, Ian Lance Taylor wrote:
>> The GNU glibc qsort function will call malloc in some cases.  That makes
>> it unsuitable for libbacktrace, which is intended to work when called
>> from a signal handler.  This patch changes libbacktrace to use an
>> internal qsort function.
>>
>> I'm posting this for comments in case anybody sees anything wrong with
>> the implementation.  I'll commit it in a day or two if I don't hear
>> anything.
>>
>> Bootstrapped and ran libbacktrace and Go tests on
>> x86_64-unknown-linux-gnu.
>
> Doesn't it make sense to put this into libiberty and call it
> sigsafe_qsort or qsort_sigsafe? (not sure if there is a standard
> suffix/prefix for signal-safe variants of functions like _r is
> for thread-safe variants)

Or use mergesort from libunwind.

Ciao!
Steven