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References: <bb1b6476-d3ab-a1da-a5bb-aad8c6958260@contemporary.net.au>
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From: Richard Biener <richard.guenther@gmail.com>
Date: Wed, 15 Jun 2022 11:56:05 +0200
Message-ID: <CAFiYyc22b67+3GeJFQmjqdHBp5jsuDx4TeFK4FDmF+L2M1euZw@mail.gmail.com>
Subject: Re: Building gcc 12 cross-compiler with --enable-lto on FreeBSD fails
To: Chris Johns <chris@contemporary.net.au>
Cc: GCC Development <gcc@gcc.gnu.org>
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On Wed, Jun 15, 2022 at 11:27 AM Chris Johns <chris@contemporary.net.au> wrote:
>
> Hi,
>
> I am trying to build a cross-compiler on FreeBSD with --enable-lto because a
> chip vendor is using it when building controller software that is part of a system.
>
> The build I am using symlinks gmp, mpfr etc as source so they are built as part
> of the gcc build.
>
> The mpfr package is reporting ...
>
> build/mpfr/config.log:configure:17408: error: Link Time Optimisation is not
> supported (see config.log for details).
>
> Should the enable option be passed to these packages?

You shouldn't need --enable-lto, it's effect (adding lto to the set of compiled
languages) is already the default.  You can use --enable-languages=default,lto
to achieve the same effect without getting the mpfr side-effect.

> I have assumed the enable option for LTO is for the cross compiler and not the
> host gcc?

it's for the built GCC, enabling LTO support (but not for enabling
building GCC itself
with LTO).

Richard.

>
> Thanks
> Chris