X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:mime-version:in-reply-to:references:date
	:message-id:subject:from:to:content-type; q=dns; s=default; b=Rn
	hffHXWzhb7LaPmKuNYXALU8M98eEjMNFuQ0mbqBflkFXR1wMrKNiz4BoEIwX7jVS
	UEuCxSEA8/Jh5kUIMuhk5Zd+/OgWIRorPAW2t+dKcMGjVYYhmbBB0m7nBB0cG9dv
	NNCMk03AMtfnHIlR52AFh1RovU3FfkVvisQQeGbws=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:mime-version:in-reply-to:references:date
	:message-id:subject:from:to:content-type; s=default; bh=ZMGHHPcp
	2ukO2moX1+L60wTS0xc=; b=lwyHCpBj7iQwnMZ5tlaNmDNx+lT7i7iGKbBrc709
	TwVYQzSCc5c8Fsd1FbtbklTF1LbJ9zVFhlCaIb+G5FFAY5cQq1d7U2fs97B2gq3p
	0UGL/yronWpti9Frotv46OFBWv4z2cI87PdaJfLUozPNcEWydukn+GX4Xt+Pl+qP
	P0k=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-0.5 required=5.0 tests=AWL,BAYES_50,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2
X-HELO: mail-oi0-f51.google.com
MIME-Version: 1.0
X-Received: by 10.202.205.137 with SMTP id d131mr29978143oig.56.1450195115048; Tue, 15 Dec 2015 07:58:35 -0800 (PST)
In-Reply-To: <20151215093020.GA12827@calimero.vinschen.de>
References: <CAPYQg31yUkpu9oC1cfWTmxaBANBYcd4X18RY9Q+BVpx-o=nLBw AT mail DOT gmail DOT com>	<20151214140649 DOT GB29983 AT calimero DOT vinschen DOT de>	<CAPYQg33AHw4k9hU8kXbsM9WJ3-+9gr5cm1Ob1S7YXO8MP3LGdQ AT mail DOT gmail DOT com>	<20151215093020 DOT GA12827 AT calimero DOT vinschen DOT de>
Date: Wed, 16 Dec 2015 00:58:34 +0900
Message-ID: <CAPYQg30566rTTPhfbEbqEXV28043zAj80V5ppkz2z0ezQ5SRMw@mail.gmail.com>
Subject: Re: __STRICT_ANSI__ and stdio.h
From: KIMURA Masaru <hiyuh DOT root AT gmail DOT com>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=UTF-8
X-IsSubscribed: yes

Hi,

>> >> is cygwin's __STRICT_ANSI__ and stdio.h behavior not so compatible to glibc's?
>> >
>> > Cygwin is using newlib, newlib is BSD based.  We introduced the
>> > compatibility checking macros from FreeBSD lately.
>>
>> i roughly checked FreeBSD include/stdio.h and sys/sys/cdefs.h.
>> https://github.com/freebsd/freebsd/blob/master/include/stdio.h
>> https://github.com/freebsd/freebsd/blob/master/sys/sys/cdefs.h
>>
>> it looks very different to newlib's.
>
> Yes, it does.  Newlib has a long history diverging from the BSDs to
> support embedded systems in the first place, and compatibility checking
> macros other than __STRICT_ANSI__ and __POSIX_SOURCE weren't much of a
> concern for a long time.
>
>> FreeBSD has visibility for popen()/pclose() if __POSIX_VISIBLE >= 199209,
>> it looks no checking about __STRICT_ANSI__ in their cdefs.h.
>
> Yeah, that's history as described above.  popen gets declared in newlib
> if __STRICT_ANSI__ is not defined right now.
>
>> only one thing i worried about is _ANSI_SOURCE in their cdefs.h,
>> (b/c i don't understand where _ANSI_SOURCE comes from...)
>> but it looks _POSIX_C_SOURCE wins anyway.
>> for ease to see, i'd attach simplified their cdefs.h for their
>> visibility handling.
>
> I don't see the difference, see below.  The big differences in newlib
> are the additional handling of _GNU_SOURCE and the old usage of
> __STRICT_ANSI__ in some circumstances which haven't been replaced by another
> usage of compatibility macros yet.
>
> But here's the deal:  Newlib is a volunteer-driven project.  If the
> compatiblity checking macros are not correct or not correctly used in
> all circumstances, newlib is happily open to patches.  Just send them
> to the newlib AT sourceware DOT org mailing list.
>
>> #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
>>  #undef _POSIX_C_SOURCE
>>  #define _POSIX_C_SOURCE 199009
>> #endif
>
> Same in Newlib's sys/cdefs.h.
>
> [SNIP]

ah, i didn't check newlib's sys/cdefs.h.
thank you for correcting my misunderstanding.

apart from standard compliance correctness,
it's good to hear newlib can deal it.
if i had more spare time to dive its source, i'd like to do it.

Peace,

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple