From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48686) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bzmfJ-00063W-3Q for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:32:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bzmfI-0001ru-CY for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:32:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41610) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1bzmfI-0001rg-7w for qemu-devel@nongnu.org; Thu, 27 Oct 2016 11:32:24 -0400 From: "Dr. David Alan Gilbert (git)" Date: Thu, 27 Oct 2016 16:32:11 +0100 Message-Id: <20161027153217.16984-3-dgilbert@redhat.com> In-Reply-To: <20161027153217.16984-1-dgilbert@redhat.com> References: <20161027153217.16984-1-dgilbert@redhat.com> Subject: [Qemu-devel] [PATCH 2/8] add QEMU_BUILD_BUG_EXPR List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, quintela@redhat.com, amit.shah@redhat.com, samuel.thibault@ens-lyon.org, jan.kiszka@siemens.com Cc: duanj@linux.vnet.ibm.com From: "Dr. David Alan Gilbert" Glib's GLIB_STATIC_ASSERT_EXPR can't be used in an array initialisation where as this rune can. Signed-off-by: Dr. David Alan Gilbert --- include/qemu/compiler.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 157698b..b6ad32c 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -88,6 +88,11 @@ #define QEMU_BUILD_BUG_ON(x) \ typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused)); +/* Evaluates to 0 or fails; seems to work in an array initialisation unlike + * GLIB_STATIC_ASSERT_EXPR. Fails on true. + */ +#define QEMU_BUILD_BUG_EXPR(x) (sizeof(int [(x)?-1:1])-sizeof(int [1])) + #if defined __GNUC__ # if !QEMU_GNUC_PREREQ(4, 4) /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ -- 2.9.3