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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:	Fri, 13 Aug 2021 20:17:58 -0700
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Brian Inglis wrote:
> On 2021-08-13 19:54, Takashi Yano via Cygwin wrote:
>> On Fri, 13 Aug 2021 15:20:40 -0700, Mark Geisert wrote:
>>> Jay Abel via Cygwin wrote:
>>>> On Fri, Aug 13, 2021 at 10:27 AM Jay Abel <jay DOT abel AT gmail DOT com> wrote:
> 
>>>> Sorry, more information.  I'm running Windows 10, 64-bit, AMD.
>>>>
>>>> I've reverted cygutils back to 1.4.16-2 and the problem is resolved.
> 
>>>>> Run cygstart with anything and no window opens.  I've tried URLS cygstart
>>>>> http://www.cygwin.com, directories cygstart . and cygstart ./  as well as
>>>>> pdf files cygstart example.pdf.
>>>>> None of these seems to do anything anymore.
> 
>>> I have the same setup as you but all seems well here.  With 1.4.16-3 installed all
>>> four of your testcases work for me.  I don't know what to suggest.
>>> When you have a chance, what does 'echo $?' say at the prompt after cygstart
>>> finishes one of your testcases?  0 means successful, 1 (or something else) means
>>> failure.
> 
>> I have the same issue with cygstart in cygutils 1.4.16-3.
>> "cygstart .; echo $?" says 0.
>> This issue only happens in 64bit cygwin and cygstart in 32bit cygwin works.
>> To look into this problem, I tried to build cygutils from source,
>> however, it fails in the link stage of getclip with the error:
>> /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: 
>> src/clip/getclip.o: in function `getclip':
>> /usr/src/debug/cygutils-1.4.16-3/src/clip/getclip.c:431: undefined reference to 
>> `__imp_RtlUnicodeToUTF8N'
>> It seems that -lntdll flag is required to build it. Doesn't this error
>> happen in your environment?
>> So I modified Makefile.am to:
>> src_clip_getclip_LDADD              = -lpopt -lntdll
>> src_clip_putclip_LDADD              = -lpopt -lntdll
>> and tried to build again and succeeded.
>> The cygstart built locally works fine.
>> So I tried to debug cygstart using gdb and it says:
>> Thread 1 received signal SIGILL, Illegal instruction.
>> The disassembling result at $rip is:
>> => 0x0000000100401c15 <+389>:   vmovdqa 0x18c3(%rip),%xmm0        # 0x1004034e0
>> This is a AVX instruction.
>> My CPU is Core i7-870, which does not support AVX.
>> Then I ran cygstart in another machine whose CPU is Core i7-4790
>> and it works without the issue.
>> Conclusion:
>> cygstart in cygutils 1.4.16-3 is compiled with AVX extentions,
>> therefore it can not run in old machine.
> 
> Any chance this could have been built with test gcc 11 using non-standard values 
> instead of defaults -march=x86-64/i686 -mtune=generic?

No, gcc 10.2.0 was used with those defaults.

..mark

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