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Re: [PATCH] Add Berkeley qsort to libiberty to make GCC host-independent
- From: Felix Yang <fei dot yang0953 at gmail dot com>
- To: Jeff Law <law at redhat dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, Ian Lance Taylor <ian at airs dot com>, dj at redhat dot com, vmakarov at redhat dot com
- Date: Wed, 13 Aug 2014 21:55:31 +0800
- Subject: Re: [PATCH] Add Berkeley qsort to libiberty to make GCC host-independent
- Authentication-results: sourceware.org; auth=none
- References: <CAFc0fxx7V6o-d0adJfbQ7=+zXFTu8Ebh0sY9oPJP0L8xrJ6oEA at mail dot gmail dot com> <53EB68AC dot 1030907 at redhat dot com>
Is this possible a Canadian build. I am afread that the qsort then is
from the MinGW/Win host?
On Wed, Aug 13, 2014 at 9:31 PM, Jeff Law <firstname.lastname@example.org> wrote:
> On 08/13/14 06:12, Felix Yang wrote:
>> Hi all,
>> The qsort library function may have different behavior on
>> different hosts (say Linux vs MinGW).
>> We may have different sorting results with qsort when there are
>> elements with the same key value.
>> GCC uses qsort a lot. And the output of certain optimizations,
>> such as IRA, relies on the sorting result of this library function.
>> The problem is that we may have different assembly code of GCC on
>> different hosts even with the same source file.
>> Normally this is not what a GCC user expect to see.
>> In order to fix this issue, I am adding Berkeley qsort to
>> libiberty in order to override the one from the library.
>> Bootstrapped on x86_64-suse-linux, OK for trunk? Please help
>> commit this patch if it's OK.
> Or we find the cases where the sort comparison routine can be tweaked to
> make it stable which makes this class of problems go away.