Subject: Re: [alpine-devel] force compile flag for musl?
To: alpine-devel@lists.alpinelinux.org
References: <20171025164614.14c4c57e@ncopa-desktop.copa.dup.pw>
From: "A. Wilcox" <awilfox@adelielinux.org>
Organization: =?UTF-8?Q?Ad=c3=a9lie_Linux?=
Message-ID: <59F0E348.6020807@adelielinux.org>
Date: Wed, 25 Oct 2017 14:17:28 -0500
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On 25/10/17 09:46, Natanael Copa wrote:
> Hi,
>=20
>=20
> I wonder what you think about overriding the -Os compile flag for=20
> musl, and hardcode it to -O2.


Possibly.  Is there some benchmarks available, maybe using libc-test
or such?


> What do you think?
>=20
> +       # force -O2 compile flag for better performance +
> CFLAGS=3D"-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 Ad=E9lie 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=3Dpentium4 x86_32, for instance).

I agree with the idea of using -O2 but not with the implementation of
blowing away all other CFLAGS.

Best,
--arw

--=20
A. Wilcox (awilfox)
Project Lead, Ad=E9lie Linux
http://adelielinux.org


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