Re: Build regressions/improvements in v4.3-rc3

[Geert Uytterhoeven]

Hi Russell,

On Mon, Sep 28, 2015 at 3:58 PM, Russell King - ARM Linux
<linux@xxxxxxxxxxxxxxxx> wrote:
> On Mon, Sep 28, 2015 at 03:50:16PM +0200, Geert Uytterhoeven wrote:
>> On Mon, Sep 28, 2015 at 11:48 AM, Russell King - ARM Linux
>> <linux@xxxxxxxxxxxxxxxx> wrote:
>> > Also, a great many of the failures are due to the build toolchain not
>> > supporting -fstack-protector-strong.  I think it's absolutely right
>> > for the build to error out if you enable a kernel feature which requires
>> > toolchain support, but the toolchain does not support that feature.
>> >
>> > What this means is that the build results from kissb are less than
>> > useful - without spending ages looking at every single build, it's
>> > hard to find the real failures we care about.
>> >
>> > I'd suggest that either the randconfig is seeded to ensure that
>> > CONFIG_CC_STACKPROTECTOR_STRONG is always disabled in ARM randconfigs,
>> > or that the ARM toolchain is updated to support this feature.
>>
>> Or that it's impossible to enable this feature if your toolchain doesn't
>> support it?
>
> I think that would require kconfig to call out to the compiler to run
> a test build.  This kind of thing has been talked about in the past
> but the feature never seems to appear - probably because it would end
> up increasing the kconfig startup time in every case.

Given the number of existing "$(call cc-option, ...)" in Makefiles, the effect
on kconfig startup time should be small.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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