[Buildroot] Arc and C-Sky toolchains

[Buildroot] Arc and C-Sky toolchains

[Giulio Benetti]

Hello Romain, Thomas, All,

I can't understand the reason why Arc and C-Sky provide a special 
toolchain(i.e. synopsis gcc10) instead of treating them like external 
toolchains. Can you help me in understanding this?

Thanks a lot
Best regards
-- 
Giulio Benetti
Benetti Engineering sas
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Re: [Buildroot] Arc and C-Sky toolchains

[Giulio Benetti]

On 9/8/21 11:29 PM, Giulio Benetti wrote:
> Hello Romain, Thomas, All,
> 
> I can't understand the reason why Arc and C-Sky provide a special
> toolchain(i.e. synopsis gcc10) instead of treating them like external
> toolchains. Can you help me in understanding this?

Is it because differently from the external ones they are provided as 
sources instead of binaries? If yes, then ok. But I would extend their 
description in package/gcc/Config.in.host like:
- bool "gcc arc (10.x)"
+ bool "synopsys's designware gcc arc (10.x)"

and
- bool "gcc csky"
+ bool "official gcc csky"

What about it?

Best regards
-- 
Giulio Benetti
Benetti Engineering sas
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Re: [Buildroot] Arc and C-Sky toolchains

[Thomas Petazzoni]

On Wed, 8 Sep 2021 23:29:07 +0200
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> I can't understand the reason why Arc and C-Sky provide a special 
> toolchain(i.e. synopsis gcc10) instead of treating them like external 
> toolchains. Can you help me in understanding this?

You're confusing things here.

ARC and C-SKY support is (was for ARC) not in upstream
gcc/binutils/gdb, so we have (had) to use specific forks of these
projects, that have support for those CPU architectures.

This is completely independent from the ability to use external
toolchains for those CPU architectures.

An external toolchain is a pre-compiled toolchain. Here what we want is
support for ARC and C-SKY in our internal toolchain backend, where
Buildroot builds gcc/binutils/gdb/libc.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] Arc and C-Sky toolchains

[Giulio Benetti]

Hello Thomas,

> Il giorno 10 set 2021, alle ore 17:18, Thomas Petazzoni <thomas.petazzoni@bootlin.com> ha scritto:
> 
> On Wed, 8 Sep 2021 23:29:07 +0200
> Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:
> 
>> I can't understand the reason why Arc and C-Sky provide a special 
>> toolchain(i.e. synopsis gcc10) instead of treating them like external 
>> toolchains. Can you help me in understanding this?
> 
> You're confusing things here.
> 
> ARC and C-SKY support is (was for ARC) not in upstream
> gcc/binutils/gdb, so we have (had) to use specific forks of these
> projects, that have support for those CPU architectures.

Ah here is the reason, they were not upstreamed

> 
> This is completely independent from the ability to use external
> toolchains for those CPU architectures.
> 
> An external toolchain is a pre-compiled toolchain. Here what we want is
> support for ARC and C-SKY in our internal toolchain backend, where
> Buildroot builds gcc/binutils/gdb/libc.

All clear now. Thank you very much.
So next patches regarding ARC gcc10 make sense.

Best regards
Giulio Benetti

> 
> Best regards,
> 
> Thomas
> -- 
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com

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