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[Qemu-devel] [PULL v4 04/23] QEMU_BUILD_BUG_ON: use __COUNTER__
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v4 04/23] QEMU_BUILD_BUG_ON: use __COUNTER__ |
Date: |
Tue, 31 Jan 2017 20:42:55 +0200 |
Some headers use QEMU_BUILD_BUG_ON. This causes a problem
if the C file including that header happens to have
QEMU_BUILD_BUG_ON at the same line number.
Fix using a widely available extension: __COUNTER__.
If unavailable, provide a stub.
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/qemu/compiler.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index 7512082..77b9ce3 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -85,9 +85,13 @@
#define typeof_field(type, field) typeof(((type *)0)->field)
#define type_check(t1,t2) ((t1*)0 - (t2*)0)
+#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) \
- typedef char glue(qemu_build_bug_on__, __LINE__)[(x) ? -1 : 1] \
+ typedef char glue(qemu_build_bug_on__, __COUNTER__)[(x) ? -1 : 1] \
__attribute__((unused))
+#else
+#define QEMU_BUILD_BUG_ON(x)
+#endif
#if defined __GNUC__
# if !QEMU_GNUC_PREREQ(4, 4)
--
MST
- [Qemu-devel] [PULL v4 00/23] virtio, vhost, pci: fixes, features, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 01/23] compiler: drop ; after BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 02/23] qxl: switch to constants within BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 03/23] ppc: switch to constants within BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 05/23] compiler: rework BUG_ON using a struct, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 04/23] QEMU_BUILD_BUG_ON: use __COUNTER__,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v4 06/23] QEMU_BUILD_BUG_ON: use __COUNTER__, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 08/23] ARRAY_SIZE: check that argument is an array, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 07/23] compiler: expression version of QEMU_BUILD_BUG_ON, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 09/23] pci: mark ROMs read-only, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 10/23] intel_iommu: fix and simplify size calculation in process_device_iotlb_desc(), Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 12/23] hw/ioh3420: derive from PCI Express Root Port base class, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 11/23] hw/pcie: Introduce a base class for PCI Express Root Ports, Michael S. Tsirkin, 2017/01/31
- [Qemu-devel] [PULL v4 13/23] hw/pcie: Introduce Generic PCI Express Root Port, Michael S. Tsirkin, 2017/01/31