[PATCH] ARM: Blacklist GCC 4.8.0 to GCC 4.8.2 - PR58854

[Nicolas Pitre]

On Thu, 16 Oct 2014, Russell King - ARM Linux wrote:

> So, let me put this another way: a compiler with this bug is _completely_
> unsuitable for use for compiling programs for use under the Linux
> kernel _as well_ as the Linux kernel itself.
> 
> The difference is that the Linaro compilers come with an expectation
> that they are usable on ARM... whereas stock versions cover a lot more
> and so the ARM arch is probably very small number of their users.
> 
> Hence why I recommend that Linaro takes down their buggy compiler.
> Their 4.8.3 version should not be used *anywhere*, just the same as
> the stock 4.8 to 4.8.2 inclusive should also not be used anywhere on
> ARM either.

Here's the answer from the toolchain team:

On Thu, 16 Oct 2014, Yvan Roux <yvan.roux at linaro.org> wrote:

| Hi Nicolas,
|
| thanks for bringing this to our knowledge.
|
| The fix for PR58854 was included in our releases since the GCC
| 4.8-2013.12 which is based on a 4.8.3 prerelease version (at svn
| revision 205577).  As we are doing monthly releases based on a
| revision of the related FSF branch, using GCC_VERSION (__GNUC__,
| __GNUC_MINOR,__GNUC_PATCHLEVEL) is not accurate enough to identify the
| release version (all our releases between November 2013 and May 2014
| will be 4.8.3) the __VERSION__ predefined macro is a bit more accurate
| here ("4.8.3 20131202 (prerelease)") but not completely satisfactory.
|
| I completely agree that we should at least mention in our impacted
| releases download pages that this bug is present.


Nicolas