DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:mime-version
	:content-type:content-transfer-encoding; q=dns; s=default; b=rsN
	v94OqjUv6tQcd3hYX3jK56ZSqNrH5ooaxRp5NRv+daFwKz6+Z4W6sHiw4/LJAZ0m
	hPAuTo6UEDwNq3InBq9mG68C5156ep9bSoCLUUcr3WgKOaKun+28DGJQuWtf0YYj
	0+oTHGa1QG8d70O2pEIs1UAOYz+MbY5FSj32er+4=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Date: Tue, 11 Jul 2017 20:01:07 -0400
From: Christopher Wellons <wellons@nullprogram.com>
To: cygwin@cygwin.com
Subject: Error from signal.h when _POSIX_C_SOURCE == 1
Message-ID: <20170712000107.GJ17540@nullprogram.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
User-Agent: Mutt/1.5.23 (2014-03-12)

A two-line source file demonstrates this bug:

    #define _POSIX_C_SOURCE 1
    #include <signal.h>

Then when compiled:

    $ gcc -c tmp.c
    In file included from /usr/include/sys/signal.h:22:0,
                     from /usr/include/signal.h:6,
                     from tmp.c:2:
    /usr/include/cygwin/signal.h:328:34: error: unknown type name ‘siginfo_t’
         void  (*sa_sigaction) ( int, siginfo_t *, void * );
                                      ^

Since _POSIX_C_SOURCE < 199309L, siginfo_t isn't defined. However, 
cygwin/signal.h erroneously uses this type anyway when defining struct 
sigaction. The sa_sigaction field in struct sigaction must also be 
guarded by the same feature test macro.

--
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