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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Subject:	Re: cpp /usr/include/threads.h fails; modfl segfaults
To:	cygwin AT cygwin DOT com
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Date:	Sun, 30 Aug 2020 14:07:51 -0600
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On 2020-08-30 00:23, ASSI wrote:
> Ken Brown via Cygwin writes:
>> OK, so the problem was introduced between 3.1.4 and 3.1.5.  It should
>> be pretty easy to bisect and find the culprit.  I'll do that tomorrow
>> if no one beats me to it.
> 
> The most likely culprit would be this I think:
> 
> https://sourceware.org/git/?p=newlib-cygwin.git;a=commitdiff;h=4ad9ba42fc3dd116bad8b9cb89d434256d3431fb
> 
> If so and depending on why exactly it fails, there might be more fallout
> from other similar changes.

OP debugged to display winsup/cygwin/math/modfl.c assembler that hasn't
changed since added, so compiler, build, or runtime environment updates may have
changed the code generated or used e.g. predefined symbols, build flags, runtime
CPU features.

Does Cygwin detect and allow GCC builtins to be used where available, keeping
the function available for fallback where the compiler can't use the builtin?

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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