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alpine-devel

Re: [alpine-devel] force compile flag for musl?

From: William Pitcock <nenolod_at_dereferenced.org>
Date: Wed, 25 Oct 2017 18:36:40 -0500

Hi,

On Wed, Oct 25, 2017 at 2:17 PM, A. Wilcox <awilfox_at_adelielinux.org> wrote:
> On 25/10/17 09:46, Natanael Copa wrote:
>> Hi,
>>
>>
>> I wonder what you think about overriding the -Os compile flag for
>> musl, and hardcode it to -O2.
>
>
> Possibly. Is there some benchmarks available, maybe using libc-test
> or such?
>
>
>> What do you think?
>>
>> + # force -O2 compile flag for better performance +
>> CFLAGS="-O2" \
>
>
> No. Stuff in abuild.conf needs to be preserved and -O2 tacked on the
> end (GCC will only honour last -O flag passed, so this is what you want).
>
> This is INCREDIBLY important to us at Adélie because for instance
> ppc64 BE requires -fno-inline-small-functions due to GCC bug elsewise
> it will cause ABI issues with long double. We also use -march / -mcpu
> which would be discarded here as well, which would cause it to be
> slower on some platforms (-O2 won't help as much on x86_32 as it would
> on -march=pentium4 x86_32, for instance).

Maybe we should fix the specfiles to bring in
-fno-inline-small-functions on ppc64/ppc64le?

This seems like something that could hurt if you run into it on a ppc64 machine.

William


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Received on Wed Oct 25 2017 - 18:36:40 GMT