[OE-core] GCC 9 Drops Support For Older ARM Microarchitecture Versions

[Khem Raj]

On Sat, May 19, 2018 at 12:33 PM, Denys Dmytriyenko <denis at denix.org> wrote:
> On Sat, May 19, 2018 at 11:07:55AM -0700, Khem Raj wrote:
>> On Sat, May 19, 2018 at 9:21 AM, Denys Dmytriyenko <denis at denix.org> wrote:
>> > https://www.phoronix.com/scan.php?page=news_item&px=GCC-9-Dropping-Older-ARM
>> >
>> > Particularly, ARMv5 and ARMv5E are being dropped (but T and TE variants
>> > remain)
>> >
>> > Are there any concerns from OE community perspective?
>>
>> From yocto project perspctive qemuarm which is emulating arm926ejs
>> with default tune armv5te is used.
>> so we are right at the trailing edge and wont be affected. However, I
>> know there were OE users who had
>> devices using other armv5 or v4 variants
>>
>> I have been suggesting to switch qemuarm to use armv7 based board
>> emulator for few years now.
>> may be this is the time to make that call for next YP release.
>
> Valid point about qemuarm, but see below.
>
>
>> > At least for binutils we needed this patch even for armv5te:
>> > http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-devtools/binutils/binutils/0007-Add-the-armv5e-architecture-to-binutils.patch
>> >
>>
>> this patch technically required to support one of OEs available tune
>> values. namely armv5e, we should be able to drop it.
>
> $ grep conf/machine meta/conf/machine/qemuarm.conf
> require conf/machine/include/qemu.inc
> require conf/machine/include/tune-arm926ejs.inc
> #require conf/machine/include/tune-arm1136jf-s.inc
>
> $ MACHINE=qemuarm bitbake virtual/kernel -e|grep -E '^DEFAULTTUNE=|^ARMPKGSFX_THUMB=|^TUNE_PKGARCH=|^TUNE_CCARGS='
> ARMPKGSFX_THUMB=""
> DEFAULTTUNE="armv5te"
> TUNE_CCARGS=" -march=armv5e -marm"
> TUNE_PKGARCH="armv5e"
>
>
> I have already tried binutils w/o that patch for arm926ejs/armv5te machine and
> it fails, because as you can see above, -march=armv5e is being passed...
>

What happens if you drop setting TUNE_CCARGS and  TUNE_PKGARCH ?

> --
> Denys