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qemu-barrier: Fix compiler version check for future gcc versions

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The current check will give a wrong result for gcc-5.x with x < 4.
Using QEMU_GNUC_PREREQ is simpler and fixes that issue.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
This commit is contained in:
Stefan Weil 2012-10-03 23:11:02 +02:00 committed by Stefan Hajnoczi
parent da665c99f1
commit 8e7e2b14e7
1 changed files with 1 additions and 1 deletions
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qemu-barrier.h
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@ -19,7 +19,7 @@
* mfence on 32 bit as well, e.g. if built with -march=pentium-m.
* However, on i386, there seem to be known bugs as recently as 4.3.
* */
#if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 4
#if QEMU_GNUC_PREREQ(4, 4)
#define smp_mb() __sync_synchronize()
#else
#define smp_mb() asm volatile("lock; addl $0,0(%%esp) " ::: "memory")