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Date: Wed, 21 Jun 2023 09:55:02 +0200
From: "Gerd Hoffmann" <kraxel@redhat.com>
To: Pedro Falcato <pedro.falcato@gmail.com>
Cc: edk2-devel-groups-io <devel@edk2.groups.io>, yi1.li@intel.com, 
	Ard Biesheuvel <ardb+tianocore@kernel.org>, Jiewen Yao <jiewen.yao@intel.com>, 
	Jordan Justen <jordan.l.justen@intel.com>
Subject: Re: [edk2-devel] [PATCH] OvmfPkg/PlatformCI: Skip GCC5_OVMF_IA32X64_FULL_NOOPT build
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On Wed, Jun 21, 2023 at 01:40:06AM +0100, Pedro Falcato wrote:
> On Tue, 20 Jun 2023, 12:11 Li, Yi, <yi1.li@intel.com> wrote:
> 
> > The effect of LTO is limited with optimization turned off, and blocked
> > the upgrade of Openssl3.0. We already skipped this build with VS2019,
> > skip the GCC NOOPT build also.
> >
> Hi,
> 
> If LTO is the problem here, have you given ffunction-sections +
> fdata-sections + gc-sections a spin?

lto alone works and reduces size a bit, also turning on optimizations
has a much bigger effect though.  Which I suspect happens because gcc
detects constant expressions then, calculates them at compile time
instead of runtime, which in turn removes function calls in code paths
never taken.

take care,
  Gerd