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Reply-To:	Brian DOT Inglis AT Shaw DOT ca
Subject:	Re: Which is it -pc- or -unknown-
To:	cygwin AT cygwin DOT com
References:	<29b66287-6bd7-4e82-b35d-12a735c2070b AT gmail DOT com> <c70fd307-1444-58db-c451-aeba3276af4c AT SystematicSw DOT ab DOT ca> <d4580edf-45b3-8de4-c83d-f4ac4034dc65 AT gmail DOT com>
From:	Brian Inglis <Brian DOT Inglis AT Shaw DOT ca>
Message-ID:	<3415f3b3-1680-9837-3f35-e011cf0a5aa9@Shaw.ca>
Date:	Tue, 17 Oct 2017 23:26:08 -0600
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On 2017-10-17 21:29, cyg Simple wrote:
> On 10/17/2017 7:49 PM, Brian Inglis wrote:
>> On 2017-10-17 13:16, cyg Simple wrote:
>>> The config.guess file[1] is confused.
>>>
>>> 840    i*:CYGWIN*:*)
>>> 841	echo ${UNAME_MACHINE}-pc-cygwin
>>> 842	exit ;;
>>> -----
>>> 870    amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
>>> 871	echo x86_64-unknown-cygwin
>>> 872	exit ;;
>>>
>>> The GCC executable is x86_64-pc-cygwin-gcc.exe but config.guess on my
>>> system gives x86_64-unknown-cygwin so specifying a fully qualified host
>>> doesn't find the executable file.  So which should it be?
>>>
>>> [1]http://git.savannah.gnu.org/cgit/config.git/tree/config.guess?id=c003e5cb947924ca5edd25c3b840aaa373c66b28
>>
>> There are also similar confusions and differences between projects and distros
>> about use of x86_64 (or x86-64) and amd64. You may have come across others.
>>
> 
> I'm only concerned with Cygwin at the moment.  As I understand it the we
> should distribute x86[_64]-unknown-cygwin-*.exe and not as
> x86[_64]-pc-cygwin-*.exe  We also need to correct config.guess for the
> i*:CYGWIN*:* match.

It seems that i686-pc-... on lines 840... is common, probably for historical
reasons, and that may be okay for 32 bit builds but I don't know the Cygwin
history here, and x86_64-unknown-... should be selected for 64 bit builds in
lines 870...
Packages for current 32 and 64 bit binutils, cygwin32-..., and gcc... are
prefixed with or found under {i686,x86_64}-pc-cygwin, so you might have to
change the vendor field in config.guess, if you want to stay consistent.
Packages emacs, octave, and pkg-config are the only ones I can find using
x86_64-unknown-cygwin prefix on 64 bit, none with i686-unknown-cygwin on 32 bit.

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

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