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Subject:	Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.4.0-0.11
To:	cygwin AT cygwin DOT com
References:	<20151216164848 DOT GM3507 AT calimero DOT vinschen DOT de> <5671EFF8 DOT 6030804 AT cornell DOT edu> <20151217093634 DOT GP3507 AT calimero DOT vinschen DOT de> <56730350 DOT 1080002 AT cornell DOT edu> <20151217201709 DOT GA28305 AT calimero DOT vinschen DOT de>
From:	Ken Brown <kbrown AT cornell DOT edu>
Message-ID:	<56731D8C.9020001@cornell.edu>
Date:	Thu, 17 Dec 2015 15:39:40 -0500
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On 12/17/2015 3:17 PM, Corinna Vinschen wrote:
> On Dec 17 13:47, Ken Brown wrote:
>> Hi Corinna,
>>
>> On 12/17/2015 4:36 AM, Corinna Vinschen wrote:
>>> Hi Ken,
>>>
>>> On Dec 16 18:12, Ken Brown wrote:
>>>> On 12/16/2015 11:48 AM, Corinna Vinschen wrote:
>>>>> - The header file layout has been cleaned up, mostly in terms of the
>>>>>     sys/select.h, sys/signal.h and sys/types.h files.  This is a generic
>>>>>     change in newlib and aligns the affected headers more closely to
>>>>>     the FreeBSD layout.
>>>>
>>>> These changes are leading to lots of errors when building emacs:
>>>>
>>>> /usr/include/cygwin/signal.h:178:3: error: unknown type name ‘pthread_attr_t’
>>>>
>>>> /usr/include/cygwin/signal.h:213:3: error: unknown type name ‘pid_t’
>>>>
>>>> /usr/include/cygwin/signal.h:230:2: error: unknown type name ‘timer_t’
>>>>
>>>> /usr/include/sys/signal.h:211:6: error: #error You need the winsup sources or a cygwin installation to compile the cygwin version of newlib.
>>>>
>>>> /usr/include/sys/signal.h:214:5: error: unknown type name ‘pthread_t’
>>>>
>>>> /usr/include/sys/time.h:104:34: error: unknown type name ‘u_int’
>>>>
>>>> [... and many more]
>>>
>>> This puzzles me.  It looks like you're missing sys/types.h when
>>> including sys/signal,h, but sys/signal.h includes sys/types.h by
>>> itself, prior to including cygwin/signal.h.
>>>
>>> How can I reproduce this?  An STC like this:
>>>
>>>    #include <signal.h>
>>>    main () {}
>>>
>>> is definitely not sufficient.
>>
>> Sorry, I hadn't looked at what was happening closely enough before sending
>> my mail.  The errors occur while compiling some Gnulib modules in the emacs
>> source tree.  It may take me a while to sort this out. Maybe Gnulib will
>> have to be patched to take Cygwin's new header layout into account.
>
> I'm still puzzled.  The changes, especially to sys/signal.h and
> cygwin/signal.h are rather minor.  The really big thing is to move the
> macros related to select(2) from sys/types.h, where they never really
> belonged to, into sys/select.h, rather than including sys/types.h from
> sys/select.h.  Especially the changes to sys/signal.h and cygwin/signal.h
> don't really add up to the error messages you encounter.  I inspected
> the files today and I really don't see how this could happen :(

Here's what happens:

One of the Gnulib modules includes sys/types.h, which includes 
sys/select.h because of the recent changes.  This brings in Gnulib's 
sys/select.h, which includes signal.h.  We then get the errors I posted 
because we haven't yet finished including sys/types.h.

All the build errors disappear if I remove '#include <sys/select.h>' 
from sys/types.h.  You said above that the macros related to select 
don't really belong in sys/types.h.  So why does the latter include 
sys/select.h?

Ken


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