llvm dev - Sep 2015 - Error compiling libc++ for ARMv6

On Fri, Sep 25, 2015 at 05:34:03PM -0700, JF Bastien via llvm-dev
wrote:
> In pre-v6 Linux you could use the kernel-provided helpers:
> 
> https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt
Please *never* tell people to use those directly. There are kernels
other than Linux and the very idea of hardcoding random kernel address
should make all red warning lights go off.

Joerg

It's part of the stable Linux ABI for ARM. Yes there are non-Linux OSes,
and I wasn't suggesting one emit these calls for non-Linux.

Please clarify the red warning lights. FWIW these functions were used by
Chrome on ARM until very recently, specifically for the sake of older ARM
CPUs.
On Sep 27, 2015 9:55 AM, "Joerg Sonnenberger" <joerg at
britannica.bec.de>
wrote:
> On Fri, Sep 25, 2015 at 05:34:03PM -0700, JF Bastien via llvm-dev wrote:
> > In pre-v6 Linux you could use the kernel-provided helpers:
> >
> > https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt
>
> Please *never* tell people to use those directly. There are kernels
> other than Linux and the very idea of hardcoding random kernel address
> should make all red warning lights go off.
>
> Joerg
>
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On Sun, Sep 27, 2015 at 05:07:17PM -0700, JF Bastien
wrote:
> It's part of the stable Linux ABI for ARM. Yes there are non-Linux
OSes,
> and I wasn't suggesting one emit these calls for non-Linux.
> 
> Please clarify the red warning lights. FWIW these functions were used by
> Chrome on ARM until very recently, specifically for the sake of older ARM
> CPUs.
I know. It is painful to find such code, especially since most instances
never checked for Linux in first place. I'm waiting for a case where
using libgcc calls doesn't work.

Joerg