llvm dev - Oct 2013 - [LLVMdev] Generate code for ARM Cortex m0, m3, and m4.

Hi,

I am trying to cross compile code for ARM Cortex m0, m3, and m4.

For m0, I use:

   -target armv6--eabi -mcpu=cortex-m0

That seems to work. For m3 and m4, I use the following which does not work
(fatal error: error in backend: CPU: 'cortex-m3' does not support ARM
mode):

  -target armv7m--eabi -mcpu=cortex-m3

and

  -target armv7em--eabi -mcpu=cortex-m4

Who can help me with the right command line arguments for m3 and m4?

Thanks,
Jan

Add -mthumb. It’s also probably a bug in the driver that that’s required. It
should be implied by the v7m triple and/or cpu. Mind filing a PR to that effect?

-Jim

On Oct 11, 2013, at 11:23 AM, Jan Hoogerbrugge <jan.hoogerbrugge at
biface-tools.com> wrote:
> Hi,
> 
> I am trying to cross compile code for ARM Cortex m0, m3, and m4.
> 
> For m0, I use:
> 
>  -target armv6--eabi -mcpu=cortex-m0
> 
> That seems to work. For m3 and m4, I use the following which does not work
> (fatal error: error in backend: CPU: 'cortex-m3' does not support
ARM mode):
> 
> -target armv7m--eabi -mcpu=cortex-m3
> 
> and
> 
> -target armv7em--eabi -mcpu=cortex-m4
> 
> Who can help me with the right command line arguments for m3 and m4?
> 
> Thanks,
> Jan
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Hi Jan,

For Cortex-M0, you should probably use the armv6m string in the target
triple. For M3 and M4 you need to use the thumbv7m arch string, -mthumb
won't be necessary.

Amara


On 11 October 2013 19:23, Jan Hoogerbrugge <
jan.hoogerbrugge at biface-tools.com> wrote:
> Hi,
>
> I am trying to cross compile code for ARM Cortex m0, m3, and m4.
>
> For m0, I use:
>
>   -target armv6--eabi -mcpu=cortex-m0
>
> That seems to work. For m3 and m4, I use the following which does not work
> (fatal error: error in backend: CPU: 'cortex-m3' does not support
ARM
> mode):
>
>  -target armv7m--eabi -mcpu=cortex-m3
>
> and
>
>  -target armv7em--eabi -mcpu=cortex-m4
>
> Who can help me with the right command line arguments for m3 and m4?
>
> Thanks,
> Jan
>
>
> ______________________________**_________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>
http://lists.cs.uiuc.edu/**mailman/listinfo/llvmdev<http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>
>
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On 12 October 2013 23:00, Amara Emerson <amara.emerson at gmail.com>
wrote:
> Hi Jan,
>
> For Cortex-M0, you should probably use the armv6m string in the target
> triple. For M3 and M4 you need to use the thumbv7m arch string, -mthumb
> won't be necessary.
>
Yes, but I agree with Jim that a bug must be filled.

Jan, would you mind filling a bug?

http://llvm.org/bugs/enter_bug.cgi?product=clang

cheers,
--renato
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