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Date: Mon, 20 Feb 2012 16:05:12 -0700
From: Eric Blake <eblake AT redhat DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: Issues with stdio.h
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On 02/20/2012 03:58 PM, Thomas Wolff wrote:
>> Wrong.  GNU/Linux does this too.  On my Fedora machine,
>>
>> $ printf '#include<stddef.h>\n#include<stdio.h>\n' | gcc -E -\
>>     |grep '^# 1 "/'
...
>> # 1 "/usr/lib/gcc/x86_64-redhat-linux/4.6.2/include/stddef.h" 1 3 4
>> # 1 "/usr/include/wchar.h" 1 3 4
>> # 1 "/usr/lib/gcc/x86_64-redhat-linux/4.6.2/include/stdarg.h" 1 3 4

>=20
> As I interpret this, stddef.h - containing those constants - is the only
> file with this setup, so be it.

Reading the trace I posted above, it is not just <stddef.h>, but also at
least <stdarg.h>, and probably others, too.

> (I had actually checked on a SunOS system.)

SunOS isn't GNU/Linux, so it is less relevant to how cygwin behaves
(since cygwin is striving to be a Linux emulation, not a POSIX
emulation).  Not to mention that using gcc on SunOS _also_ prefers to
translate <stddef.h> to a gcc-specific directory, rather than
/usr/include/stddef.h, since gcc relies on aspects that are specific to
the gcc compiler, while /usr/include/stddef.h is tied to the system's
own 'cc' that doesn't understand gcc extensions.

--=20
Eric Blake   eblake AT redhat DOT com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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