compiler-gcc{3,4}.h: Use GCC_VERSION macro

Using GCC_VERSION reduces complexity, is easier to read and is GCC's
recommended mechanism for doing version checks.  (Just don't ask me why
they didn't define it in the first place.) This also makes it easy to
merge compiler-gcc{,3,4}.h should somebody want to.

Signed-off-by: Daniel Santos <daniel.santos@pobox.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Joe Perches <joe@perches.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/compiler-gcc3.h

@@ -2,22 +2,22 @@
 #error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
 #endif
 
-#if __GNUC_MINOR__ < 2
+#if GCC_VERSION < 30200
 # error Sorry, your compiler is too old - please upgrade it.
 #endif
 
-#if __GNUC_MINOR__ >= 3
+#if GCC_VERSION >= 30300
 # define __used			__attribute__((__used__))
 #else
 # define __used			__attribute__((__unused__))
 #endif
 
-#if __GNUC_MINOR__ >= 4
+#if GCC_VERSION >= 30400
 #define __must_check		__attribute__((warn_unused_result))
 #endif
 
 #ifdef CONFIG_GCOV_KERNEL
-# if __GNUC_MINOR__ < 4
+# if GCC_VERSION < 30400
 #   error "GCOV profiling support for gcc versions below 3.4 not included"
 # endif /* __GNUC_MINOR__ */
 #endif /* CONFIG_GCOV_KERNEL */

include/linux/compiler-gcc4.h

@@ -4,7 +4,7 @@
 
 /* GCC 4.1.[01] miscompiles __weak */
 #ifdef __KERNEL__
-# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
+# if GCC_VERSION >= 40100 &&  GCC_VERSION <= 40101
 #  error Your version of gcc miscompiles the __weak directive
 # endif
 #endif
@@ -13,11 +13,11 @@
 #define __must_check 		__attribute__((warn_unused_result))
 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
 
-#if __GNUC_MINOR__ > 0
+#if GCC_VERSION >= 40100
 # define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
 #endif
 
-#if __GNUC_MINOR__ >= 3
+#if GCC_VERSION >= 40300
 /* Mark functions as cold. gcc will assume any path leading to a call
    to them will be unlikely.  This means a lot of manual unlikely()s
    are unnecessary now for any paths leading to the usual suspects
@@ -41,9 +41,9 @@
 # define __compiletime_warning(message) __attribute__((warning(message)))
 # define __compiletime_error(message) __attribute__((error(message)))
 #endif /* __CHECKER__ */
-#endif /* __GNUC_MINOR__ >= 3 */
+#endif /* GCC_VERSION >= 40300 */
 
-#if __GNUC_MINOR__ >= 5
+#if GCC_VERSION >= 40500
 /*
  * Mark a position in code as unreachable.  This can be used to
  * suppress control flow warnings after asm blocks that transfer
@@ -58,9 +58,9 @@
 /* Mark a function definition as prohibited from being cloned. */
 #define __noclone	__attribute__((__noclone__))
 
-#endif /* __GNUC_MINOR__ >= 5 */
+#endif /* GCC_VERSION >= 40500 */
 
-#if __GNUC_MINOR__ >= 6
+#if GCC_VERSION >= 40600
 /*
  * Tell the optimizer that something else uses this function or variable.
  */
@@ -69,11 +69,11 @@
 
 
 #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
-#if __GNUC_MINOR__ >= 4
+#if GCC_VERSION >= 40400
 #define __HAVE_BUILTIN_BSWAP32__
 #define __HAVE_BUILTIN_BSWAP64__
 #endif
-#if __GNUC_MINOR__ >= 8 || (defined(__powerpc__) && __GNUC_MINOR__ >= 6)
+#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600)
 #define __HAVE_BUILTIN_BSWAP16__
 #endif
-#endif
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */