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[Qemu-devel] [PATCH] rewrite QEMU_BUILD_BUG_ON

From: Dong Xu Wang
Subject: [Qemu-devel] [PATCH] rewrite QEMU_BUILD_BUG_ON
Date: Tue, 20 Dec 2011 17:03:47 +0800

From: Dong Xu Wang <address@hidden>

On some platforms, __LINE__ will not expand to real number in QEMU_BUILD_BUG_ON,
so if using QEMU_BUILD_BUG_ON twice, compiler will report errors. This patch 
fix it.

BTW, I got error message on RHEL 6.1/gcc 4.4.5.

Signed-off-by: Dong Xu Wang <address@hidden>
 compiler.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/compiler.h b/compiler.h
index a1c0794..736e770 100644
--- a/compiler.h
+++ b/compiler.h
@@ -30,8 +30,10 @@
 # define QEMU_PACKED __attribute__((packed))
+#define cat(x,y) x ## y
+#define cat2(x,y) cat(x,y)
 #define QEMU_BUILD_BUG_ON(x) \
-    typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];
+    typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
 #if defined __GNUC__
 # if !QEMU_GNUC_PREREQ(4, 4)

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