RISC-V tool chain

[Hesham Almatary]

On Mon, May 28, 2018 at 10:38 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> On 28/05/18 11:14, Hesham Almatary wrote:
>>
>> On Mon, May 28, 2018 at 6:23 AM, Sebastian Huber
>> <sebastian.huber at embedded-brains.de>  wrote:
>>>
>>> Hello,
>>>
>>> we currently have a riscv32-rtems* and riscv64-rtems* tool chain.
>>> However,
>>> the RISC-V GCC is a bi-arch compiler, e.g. we have
>>>
>>> riscv32-rtems5-gcc --print-multi-lib
>>> .;
>>> rv32i/ilp32;@march=rv32i at mabi=ilp32
>>> rv32im/ilp32;@march=rv32im at mabi=ilp32
>>> rv32iac/ilp32;@march=rv32iac at mabi=ilp32
>>> rv32imac/ilp32;@march=rv32imac at mabi=ilp32
>>> rv32imafc/ilp32f;@march=rv32imafc at mabi=ilp32f
>>> rv64imac/lp64;@march=rv64imac at mabi=lp64
>>> rv64imafdc/lp64d;@march=rv64imafdc at mabi=lp64d
>>>
>>> riscv64-rtems5-gcc --print-multi-lib
>>> .;
>>> rv32i/ilp32;@march=rv32i at mabi=ilp32
>>> rv32im/ilp32;@march=rv32im at mabi=ilp32
>>> rv32iac/ilp32;@march=rv32iac at mabi=ilp32
>>> rv32imac/ilp32;@march=rv32imac at mabi=ilp32
>>> rv32imafc/ilp32f;@march=rv32imafc at mabi=ilp32f
>>> rv64imac/lp64;@march=rv64imac at mabi=lp64
>>> rv64imafdc/lp64d;@march=rv64imafdc at mabi=lp64d
>>>
>>> The only difference is the default ISA.
>>>
>>> I suggest to merge the two tool chains into one riscv-rtems* variant.
>>>
>> We can get rid of riscv32* and just use riscv64* to build 32-bit
>> RTEMS. The question is whether it's easy/feasible to have just
>> "riscv-rtems*" toolchain (i.e. without 32 or 64 suffixes ), from
>> gcc/source-builder.
>
>
> I try currently a different direction. I use custom multilibs and changed
> the default cmodel to medany for the 64-bit variants. See attached patch.
>
Thanks for sharing the patch, this solution is neat. We can get rid of
the arch alias hack. I've a board now I can test on, will give it a
try.

>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>



-- 
Hesham