That line was very recently added, here: 
https://github.com/OpenImageIO/oiio/pull/3690 
<https://github.com/OpenImageIO/oiio/pull/3690>
Presumably this was evidence that the definition needed to be made for non-Mac 
ARM-based machines.

Yet more evidence that without any ARM machines in our CI matrix, it's very 
hard to avoid breaking things.

I think that the definition shouldn't be in this spot. No definition should be 
defined inside a function definition, I'm sorry I didn't catch that when I 
reviewed the patch.

I have a specific remedy that I'd prefer, so please just give me a few minutes 
to prepare a PR that fixes this in a clean way.

        -- lg


> On Jan 2, 2023, at 3:29 PM, Mikael Sundell <mikael.sund...@gmail.com> wrote:
> 
> Hey all,
> On Mac with Apple clang version 13.1.6 __ARM_NEON__ is already defined and 
> will fire a macro redefined error during build. Platform.h: 602 below. Before 
> suggesting a fix this code has been tested on non-Mac ARM builds only?
> 
> #elif (defined(_M_ARM64) || defined (__aarch64__) || defined(__aarch64))
>     info[0] = 0; info[1] = 0; info[2] = 0; info[3] = 0;
>     #define __ARM_NEON__
> #else
>     info[0] = 0; info[1] = 0; info[2] = 0; info[3] = 0;
> #endif
> 
> Stupid idea to simply change the definition to OIIO_NEON and change the use 
> of the macro across oiio, simd.h.
> 
> mikaelsundell@Mikaels-iMac-M1 OpenImageIO % grep -Rn __ARM_NEON__
> ./platform.h:602:    #define __ARM_NEON__
> ./simd.h:84:#elif defined(__GNUC__) && defined(__ARM_NEON__)
> ./simd.h:214:#if defined(__ARM_NEON__) && !defined(OIIO_NO_NEON)
> 
> Will submit a PR just want to make sure I don't introduce new problems, I'm a 
> Mac-only user these days :-)
> 
> Mikael
> 
> 
> 
> 
> _______________________________________________
> Oiio-dev mailing list
> Oiio-dev@lists.openimageio.org
> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org

--
Larry Gritz
l...@larrygritz.com





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