From: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
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
Subject: [Qemu-devel] [PATCH 2/8] add QEMU_BUILD_BUG_EXPR
Date: Thu, 27 Oct 2016 16:32:11 +0100 [thread overview]
Message-ID: <20161027153217.16984-3-dgilbert@redhat.com> (raw)
In-Reply-To: <20161027153217.16984-1-dgilbert@redhat.com>
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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 <dgilbert@redhat.com>
---
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
next prev parent reply other threads:[~2016-10-27 15:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-27 15:32 [Qemu-devel] [PATCH 0/8] VMSTATE_WITH_TMP and it's use in SLIRP Dr. David Alan Gilbert (git)
2016-10-27 15:32 ` [Qemu-devel] [PATCH 1/8] migration: extend VMStateInfo Dr. David Alan Gilbert (git)
2017-02-13 12:02 ` Juan Quintela
2016-10-27 15:32 ` Dr. David Alan Gilbert (git) [this message]
2017-02-13 12:02 ` [Qemu-devel] [PATCH 2/8] add QEMU_BUILD_BUG_EXPR Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 3/8] migration: Add VMSTATE_WITH_TMP Dr. David Alan Gilbert (git)
2017-02-13 12:04 ` Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 4/8] tests/migration: Add test for VMSTATE_WITH_TMP Dr. David Alan Gilbert (git)
2017-02-13 12:06 ` Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 5/8] slirp: VMState conversion; tcpcb Dr. David Alan Gilbert (git)
2017-02-13 12:06 ` Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 6/8] slirp: VMStatify sbuf Dr. David Alan Gilbert (git)
2016-10-30 14:40 ` Samuel Thibault
2017-02-13 12:07 ` Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 7/8] slirp: VMStatify socket level Dr. David Alan Gilbert (git)
2016-10-30 14:47 ` Samuel Thibault
2016-11-07 19:55 ` Dr. David Alan Gilbert
2017-02-13 12:13 ` Juan Quintela
2016-10-27 15:32 ` [Qemu-devel] [PATCH 8/8] slirp: VMStatify remaining except for loop Dr. David Alan Gilbert (git)
2016-10-30 14:51 ` Samuel Thibault
2016-11-07 19:30 ` Dr. David Alan Gilbert
2017-02-13 12:09 ` Juan Quintela
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