[PATCH] tools/gnu: Enable LTO in RSB tools

[Joel Sherrill]

On Wed, Jun 15, 2022 at 5:29 PM Chris Johns <chrisj at rtems.org> wrote:

> On 15/6/2022 10:58 pm, Joel Sherrill wrote:
> > What's the problem with enabling LTO support in the tools by default?
>
> None that I know of and this patch enables the support by default. The RSB
> incorrectly supported the configure `--enable-lto` option. That option
> controls
> the host build and when enabled the built host executables are built with
> LTO.
>
> For RTEMS building LTO support is via the languages option, ie it is
> treated as
> a language. This patch provides that support and enables it.
>

I'm happy with that. If it is going to cause a problem building the tools,
it would
be better to know it and then disable it for an architecture until that's
resolved.

>
> > Using it is a different matter.
>
> Yes. I comments were an attempt to highlight this. I would like to see LTO
> support available but it is not something all users will use.
>
> FYI Xilinx use to build the Microblaze firmware for the PMC/PMS cores in
> the Versal.
>

 Interesting. I wonder if we have any examples that would show
a real benefit from it. I think it would take a real application to
see an advantage.

--joel


> Chris
>
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