From patchwork Fri Oct 5 14:00:30 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [10/12] qemu-barrier: Fix compiler version check for future gcc versions Date: Fri, 05 Oct 2012 04:00:30 -0000 From: Stefan Hajnoczi X-Patchwork-Id: 189497 Message-Id: <1349445632-23674-11-git-send-email-stefanha@gmail.com> To: Anthony Liguori Cc: Stefan Weil , qemu-devel@nongnu.org, Stefan Hajnoczi From: Stefan Weil 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 Signed-off-by: Stefan Hajnoczi --- qemu-barrier.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/qemu-barrier.h b/qemu-barrier.h index 7e11197..16f0942 100644 --- a/qemu-barrier.h +++ b/qemu-barrier.h @@ -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")