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:date:from:to:subject:message-id:reply-to :references:mime-version:content-type:in-reply-to; q=dns; s= default; b=Y1VBfuPGcbRO7Bw+y6r97OUUoObURzSDHT3oW/3AEVvCx1/LejUGp Bw68jIC+ZEFxt8DzWBpBip2yuR1E4azJ36JbMqb61LgKuHE0EFu3zTl/YVPAg6m5 o47/s1ghPnkf4M3P7Vt2wVgZ7er5Ni24YqZZYMhjtR6GBIA9CauxdQ= 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:date:from:to:subject:message-id:reply-to :references:mime-version:content-type:in-reply-to; s=default; bh=763vq+XSuRuhehcOQo8yyCEYzH8=; b=I1Dej43uUf5z2uvUKvJ2VcopwJ0d bc2Lm/YGParxYcfBAkL0vc5AT8gZqjhjqxdRR5uMqZzaAU96ldU1fy7hBSB0Yx2r 7pzIpp0CplKUorUerpxLCF/vzrDa2mOqEsmPmv9wxnFeOYERHkGuAHJ6l/xnAkqd TQ3cv9l4irKN7uM= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com X-Spam-SWARE-Status: No, score=-1.8 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.1 Date: Thu, 30 May 2013 22:03:44 +0200 From: Corinna Vinschen To: cygwin AT cygwin DOT com Subject: Re: bug in Message-ID: <20130530200344.GA23141@calimero.vinschen.de> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <51A78E70 DOT 1010600 AT redhat DOT com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <51A78E70.1010600@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) On May 30 11:37, Eric Blake wrote: > STC - this program does nothing useful when executed; it merely exists > to show a compilation problem extracted from a larger program: > > $ cat foo.c > #ifdef WORKAROUND > # include > #endif > #include > #include > int main(void) { > const struct msghdr msg; > return sendmsg(0, &msg, 0); > } > $ gcc -o foo -Wall foo.c > foo.c: In function 'main': > foo.c:9:5: warning: passing argument 2 of 'sendmsg' from incompatible > pointer type > /usr/include/sys/socket.h:42:11: note: expected 'const struct msghdr *' > but argument is of type 'const struct msghdr *' > $ gcc -o foo -Wall foo.c -DWORKAROUND > $ > > Gcc has a less-than-stellar error message (expect type X but have type > X); it could do a better job about pointing out that it is complaining > about two different 'type X' declarations, and where they come from. > But the root cause is that if is included first, then the use > of 'struct msghdr' applied in the declaration of sendmsg() is somehow > scoped incorrectly (local to the declaration rather than the global > type), so that the compiler really is complaining about two different > incompatible 'struct msghdr' layouts. I'm not quite sure what the fix > should be, [...] Try this: Index: cygwin/if.h =================================================================== RCS file: /cvs/src/src/winsup/cygwin/include/cygwin/if.h,v retrieving revision 1.11 diff -u -p -r1.11 if.h --- cygwin/if.h 21 Jan 2013 04:38:30 -0000 1.11 +++ cygwin/if.h 30 May 2013 20:02:56 -0000 @@ -16,7 +16,7 @@ extern "C" { #endif /* __cplusplus */ #include -#include +#include /* Standard interface flags. */ #define IFF_UP 0x1 /* interface is up */ It resolves a circular dependency problem in the header files. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat -- 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