From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: XEN 3.0.1 vsprintf.c - strange macro expansion Date: Tue, 23 May 2006 12:40:32 -0500 Message-ID: <44734910.4000201@us.ibm.com> References: <447346DC.7090806@ellebore.saclay.cea.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <447346DC.7090806@ellebore.saclay.cea.fr> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: armand.puccetti@cea.fr Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Armand Puccetti wrote: > When preprocessing the file vsprintf.c, macro 'va_arg' gets expanded > into '__builtin_va_arg', which is not XEN code. > > For instance, at line 317 of that file, > > field_width = va_arg(args,int); > > becomes > > field_width = __builtin_va_arg(args,int); > > using the preprocessing command below. > > cpp -C -E -nostdinc -iwithprefix include > -I.../xen-3.0.1/xen/include > -I.../xen-3.0.1/xen/include/asm-x86/mach-generic > -I.../xen-3.0.1/xen/include/asm-x86/mach-default -DNDEBUG -D__i386__ > vsprintf.c > > The def inition of macro va_arg is located in file acenv.h:298, but > has little to do with this result. > Settings: Compiler: gcc 4.0.2, OS: Ubuntu Linux kernel 2.6.12.10 I don't know what acenv.h but AFAIK we aren't using it's va_arg() definition. We include stdarg.h and I assume we build with libgcc. Regards, Anthony Liguori > What might be the reason of this behavior? A bug in gcc? > > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel