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Re: conditionals for platform-specific MAKE_ENV options

> On Jul 24, 2019, at 7:23 AM, wrote:
> On Tue, Jul 23, 2019 at 07:35:31AM -0600, Brook Milligan wrote:
>> I am trying to make a package that has the following notes about compiling:
>> - If you see compilation errors, try make sse2only=1 to disable SSE4 code.
> With this comment I suspect they have feature-detection code, but
> include this in case someone is building with a very old compiler that
> can't do some shiny AVX thing.
> So, if the default compiler you have works with it without
> needing to specify any additional compiler flags and no use of
> -march=native or -mcpu=veryshiny, I would ignore this comment.

To follow up on this thread, I have decided to try the following.  

The Makefile has the following bits for the arm-related flags.  I cannot test this, so I would appreciate confirmation that this is correct (or suggestions).

.if !empty(MACHINE_ARCH:Mearmv[678])
MAKE_ENV+=	arm_neon=1

.if !empty(MACHINE_ARCH:Maarch64)
MAKE_ENV+=	aarch64=1

The contents of are the following:


.include "../../mk/"

### Use SSE4 instructions
.if !empty(PKG_OPTIONS:Msse4)
# SSE4 instructions are the default
MAKE_ENV+=	sse2only=1

This allows users to select SSE4, but the default is SSE2 only.

Please let me know if I have missed anything or chosen incorrectly.


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