[OE-core] [PATCH][morty] gcc6: Upgrade to 6.4.0 (latest stable series release)

[Martin Jansa]

On Sun, Mar 04, 2018 at 11:21:32AM +0000, Richard Purdie wrote:
> From: Juro Bystricky <juro.bystricky at intel.com>
> 
> Changed BINV and PV from 6.2.0 to 6.4.0
> Modified BASEURI to load xz tarball instead of bz2
> 
> Backported series of patches from https://github.com/hjl-tools/gcc.git
> branch /hjl/indirect/gcc-6-branch/master which contains
> an IA patch series for security related issues
> 
> ubsan-fix-check-empty-string.patch : removed, already applied

Very limited testing with this change in morty shows that raspberrypi3
(cortexa7hf-neon-vfpv4) build of glibc-initial fails with:

configure:5344: checking for broken __attribute__((alias()))
configure:5359: arm-oe-linux-gnueabi-gcc  -march=armv7ve -marm
-mfpu=neon-vfpv4  -mfloat-abi=hard -mcpu=cortex-a7
--sysroot=sysroots/raspberrypi3-tcbootstrap
-Werror -S conftest.c -o conftest.s 1>&5
conftest.c:1:0: error: switch -mcpu=cortex-a7 conflicts with
-march=armv7ve switch [-Werror]
         extern int foo (int x) __asm ("xyzzy");

cc1: all warnings being treated as errors
configure:5362: $? = 1
configure:5372: result: yes
configure:5375: error: working alias attribute support required

Which is a bit strange as armv7ve was added to resolve this error with
-mcpu=cortexa7 and -march=armv7a in:

commit 35392025f3236f5e5393f9cf0857732da9a2e503
Author: Martin Jansa <Martin.Jansa at gmail.com>
Date:   Tue Oct 6 17:08:59 2015 +0200

    arch-armv7ve: add tune include for armv7ve and use it from cortexa7
and cortexa15
    
    * be aware that this -march value is available only in gcc-4.9 and
      newer:
      https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57907
    * -mcpu=cortex15 and -mcpu=cortexa7 conflict with -march=armv7a
      We either have to stop putting -march in default CCARGS or at
      least set it compatible one like this patch does.

Regards,
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