Re: RFC: drop support for gcc < 4.0

Russell King
2007-08-21T17:56:06Z

On Tue, Aug 21, 2007 at 07:35:50PM +0200, Adrian Bunk wrote:
> On Tue, Aug 21, 2007 at 09:31:03AM -0700, Randy Dunlap wrote:
> > On Tue, 21 Aug 2007 15:20:38 +0200 Jarek Poplawski wrote:
> >
> > > Here are some more of, probably well-known, warnings with attached
> > > testing-only .config.
> > >...
> > > drivers/pci/msi.c:686: warning: weak declaration of `arch_msi_check_device' after first use results in unspecified behavior
> > > drivers/pci/msi.c:698: warning: weak declaration of `arch_setup_msi_irqs' after first use results in unspecified behavior
> > > drivers/pci/msi.c:718: warning: weak declaration of `arch_teardown_msi_irqs' after first use results in unspecified behavior
> > >...
> >
> > What gcc version? I don't get the arch_ warnings in drivers/pci/msi.c.
>
> Obviously a gcc <= 3.4 [1], and therefore no unit-at-a-time.
>
> You can reproduce it with a more recent gcc when adding
> -fno-unit-at-a-time to the CFLAGS.
>
> And it's becoming a real maintainance problem that not only this problem
> but also other problems like some section mismatches [2] are only
> present without unit-at-a-time.
>
> Currently we support 6 different stable gcc release series, and it might
> be the right time to consider dropping support for the older ones.
>
> Are there any architectures still requiring a gcc < 4.0 ?

I want to keep support for gcc 3.4.3 for ARM for the forseeable future.
>From my point of view, gcc 4 compilers have been something of a development
thing as far as the ARM architecture goes. Also, gcc 3.4.3 is faster and
significantly less noisy than gcc 4.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/