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References: <e4f9f62e-ec33-0c68-42b1-d157262d4590@jeffunit.com>
From: jeff <jeff@jeffunit.com>
Message-ID: <ba03a26e-0ce6-8f5b-b070-04d4c3ea7ba3@jeffunit.com>
Date: Sat, 27 Aug 2016 09:27:54 -0700
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Brian Inglis wrote:

Apparently it's a mobile Broadwell without AVX or AVX2,
which might be assumed present in gcc as compiled,
requiring a custom gcc build to run on that cpu.

My reply:

You are correct. The gcc people replied to my bug report with:

"So the problem is your GMP/MPFR are compiled for one type of CPU and cannot be
copied to other type."

They closed it as a resolved issue.

So the problem is that gcc now requires GMP, and GMP was compiled with options that
are not compatible with my CPU. I can fix the issue for myself by compiling everything
from scratch.

The bigger issue is can cygwin distribute a version of gcc that will work with all modern
processors, including mine, with it's weird lack of AVX and AVX2. Since I ran into the
issue, I suspect anyone else with a mobile processor like mine will run into the issue.
I don't know enough about how cygwin is built and installed to know how different versions
of the GMP library might be distributed for different Intel processors.

But the problem is not going to go away, and really should be addressed in order to make
cygwin run on all reasonable platforms.

jeff


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