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Subject:	Re: Just updated cygutils and cygstart no longer works
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From:	Mark Geisert <mark AT maxrnd DOT com>
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Date:	Sat, 14 Aug 2021 01:46:02 -0700
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Hi Achim,

Achim Gratz wrote:
> Achim Gratz writes:
>> The Cygwin gcc is configured to use -mtune=generic,
> 
> …and -march=x86_64 on 64bit and -march=i686 on 32bit.
> 
> While I'd love to switch to x86_64-v2, that would cut off a few
> processors that Win7 can be installed on.

Thanks for the tips.  Will do.

What I've figured out is that it's not the cygstart code itself that's been 
mis-compiled, it's apparently code pulled in from libcygwin.a as cygstart.exe is 
being built (on my machine before packaging).

I do have different gcc/g++ options for building local cygwin1.dll and 
libcygwin.a: "-O2 -march=native -mtune=native".  The offending AVX instructions 
are located in _cygwin_crt0_common().  I also see a couple hundred other cases of 
AVX instructions within locally-built cygwin1.dll but those aren't important for 
resolving this issue.

Sorry to any users who have or will run into this before it's fixed.  If you're on 
a machine that supports AVX instructions you'll be OK.  Otherwise, downgrading 
your cygutils packages to 1.4.16-2 will avoid the problem.

..mark

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