[PATCH] Improve check for GCC compiler version

[Khem Raj]

When using unreleased compiler has version like
15.0.1 and that test fails because __GNUC_MINOR__ < 1
becomes true, therefore check for full version string
which is more rubust.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 ubifs-utils/common/atomic.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ubifs-utils/common/atomic.h b/ubifs-utils/common/atomic.h
index f287d43..95754b2 100644
--- a/ubifs-utils/common/atomic.h
+++ b/ubifs-utils/common/atomic.h
@@ -2,8 +2,12 @@
 #ifndef __ATOMIC_H__
 #define __ATOMIC_H__
 
+#define GCC_VERSION (__GNUC__ * 10000 \
+                     + __GNUC_MINOR__ * 100 \
+                     + __GNUC_PATCHLEVEL__)
+
 /* Check GCC version, just to be safe */
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC_MINOR__ < 1)
+#if GCC_VERSION < 40100
 # error atomic.h works only with GCC newer than version 4.1
 #endif /* GNUC >= 4.1 */