linux-kernel - Re: Build failures with gcc 4.5 and older

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Message-ID: <CA+8MBbJ=09jAHNZTFrwMFFGbUSWEMYCDxKTMvM2XE+daVa599g@mail.gmail.com>
Date:   Tue, 14 Aug 2018 13:19:01 -0700
From:   Tony Luck <tony.luck@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        riel@...riel.com, Mike Galbraith <efault@....de>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Build failures with gcc 4.5 and older

On Tue, Aug 14, 2018 at 11:02 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Tue, Aug 14, 2018 at 10:20:32AM -0700, Linus Torvalds wrote:
> > On Tue, Aug 14, 2018 at 10:09 AM Guenter Roeck <linux@...ck-us.net> wrote:
> > >
> > > Does that mean that gcc 4.5 and older are now officially no longer
> > > supported for compiling the kernel ?
> >
> > I guess we might as well make this the excuse for making that official.
> >
> > Maybe it's trivially fixable, but I don't even want to look at it,
> > since we've talked about updating the minimum gcc version so long.
> >
> > > If so, would it make sense to update include/linux/compiler-gcc.h
> > > accordingly ?
> >
> > Unless somebody cares, and comes with a trivial fix to make old
> > compilers happy, let's just do that.
> >
>
> Only implication is that it is the death warrant for unicore32,
> since the only compiler available for it is gcc 4.4.2.

My ia64 test box only has 4.3.4.  I seem to remember some pain points
with newer versions of gcc on ia64. I need to poke around and find one
new enough to get past this problem, but that still works for kernel building.

-Tony