[LLVMdev] Setting up a cross-compiler for cortex-m3

[Chris Cadwallader]

On Darwin, if -march is armv7 clang's driver will assume you want thumb2 unless you also give it -mno-thumb but that is irrelevant with mcpu=cortex-m3.

I agree its a mess.

-Chris

On Jul 22, 2012, at 4:37 PM, Renato Golin wrote:

> On 22 July 2012 20:42, Anton Korobeynikov <anton at korobeynikov.info> wrote:
>>> Any suggestions?
>> Try to specify CPU explicitly.
> 
> He shouldn't have to, but that might help. Maybe setting -march? This
> is a big mess...
> 
> I thought that v7 always assumed Thumb2 for the thumb flag, and v7M
> should always assume Cortex-M3 CPU if none provided.
> 
> It's funny that James had a great patch to solve all those problems by
> implementing Clang's architecture selection in table-gen more than an
> year ago. I wonder what happened to that thread... :/
> 
> -- 
> cheers,
> --renato
> 
> http://systemcall.org/
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