triples for baremetal

[Iain Sandoe]

On 17 Jun 2014, at 18:27, Saleem Abdulrasool wrote:

> 
> On Jun 17, 2014, at 9:45 AM, Jonathan Roelofs <jonathan at codesourcery.com> wrote:
> 
>> [+llvm-dev, cfe-dev]
>> 
>> Was "Re: [PATCH] ARM: allow inline atomics on Cortex M"
>> 
>> On 6/17/14, 10:42 AM, Jonathan Roelofs wrote:
>>> 
>>> 
>>> On 6/17/14, 9:35 AM, Renato Golin wrote:
>>>> On 17 June 2014 16:29, Jonathan Roelofs <jonathan at codesourcery.com> wrote:
>>>>> Attached is what I now think the patch ought to be.
>>>> 
>>>> Does unknownOS *always* mean bare-metal?
>>> I'm not sure. It might be a good time to fork this thread, and start another
>>> about triples for bare-metal...
>> 
>> Personally, I think we ought to add a 'None' entry to the OSType enum specifically for baremetal, and then map triples like arm-none-eabi and arm--eabi to it (but not arm-foobar-eabi, for example).
>> 
>> Thoughts?
> 
> Am I mistaken in that this is currently modeled as the following triple: {<arch>, <vendor>, Invalid, <environment>}.  To help clarify what I mean, consider the following armv4 baremetal eabi target: armv7---eabi.  It is arguably less than ideal for typing, but, it *should* work.
> 
> IIRC, config.sub uses unknown for the vendor field, and none for the os field, so the use of none may not be that bad.

<arch>-<vendor>-none-<environment>  

has the merit of making the "none" explict (although it's agreed that absence of a statement could be taken as defaulting to none)

Being explicit perhaps simplifies decoding default cases for the driver (e.g. if the User types 'arm-elf').



> 
>> Jon
>> 
>>>> 
>>>> --renato
>>>> 
>>> 
>> 
>> -- 
>> Jon Roelofs
>> jonathan at codesourcery.com
>> CodeSourcery / Mentor Embedded
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> -- 
> Saleem Abdulrasool
> abdulras (at) fb (dot) com
> 
> 
> 
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