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Date: Thu, 12 Aug 2010 14:24:39 +0400
From: "Dmitry V. Levin" <ldv@altlinux.org>
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Subject: Re: [devel] -D_FORTIFY_SOURCE=2
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On Thu, Aug 12, 2010 at 02:19:26PM +0400, Alexey Tourbin wrote:
> On Thu, Aug 12, 2010 at 02:02:17PM +0400, Sergey V Turchin wrote:
> > man gcc =D0=D2=CF -O2
> > "NOTE: In ALT Linux gcc 4.1.1-alt9 and later versions, -D_FORTIFY_SOURC=
E=3D2 is=20
> > set by default, and is activated when -O is set to 2 or higher.
>=20
> BTW, I find this incomprehensible.  Is it really enabled by default,
> or is it only enabled with -O2 and higher?  Leaving aside the fact of
> me being curious about whether -Os is higher than -O2...
>=20
> I felt like fortification and optimization are really different
> compiler features.  To me, it's unclear why -O2 should trigger
> fortification.

Yes, that's odd, but _FORTIFY_SOURCE is implemented in glibc header files
this way.


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